Tuesday, November 22, 2016

New strategies in sport nutrition to increase exercise performance.



New strategies in sport nutrition to increase exercise performance.

Close GL, Hamilton DL, Philp A, Burke LM, Morton JP.
Free Radic Biol Med. 2016 Sep;98:144-58.

Abstract
Despite over 50 years of research, the field of sports nutrition continues to grow at a rapid rate. Whilst the traditional research focus was one that centred on strategies to maximise competition performance, emerging data in the last decade has demonstrated how both macronutrient and micronutrient availability can play a prominent role in regulating those cell signalling pathways that modulate skeletal muscle adaptations to endurance and resistance training.
Nonetheless, in the context of exercise performance, it is clear that carbohydrate (but not fat) still remains king and that carefully chosen ergogenic aids (e.g. caffeine, creatine, sodium bicarbonate, beta-alanine, nitrates) can all promote performance in the correct exercise setting.
In relation to exercise training, however, it is now thought that strategic periods of reduced carbohydrate and elevated dietary protein intake may enhance training adaptations whereas high carbohydrate availability and antioxidant supplementation may actually attenuate training adaptation.
Emerging evidence also suggests that vitamin D may play a regulatory role in muscle regeneration and subsequent hypertrophy following damaging forms of exercise.
Finally, novel compounds (albeit largely examined in rodent models) such as epicatechins, nicotinamide riboside, resveratrol, β-hydroxy β-methylbutyrate, phosphatidic acid and ursolic acid may also promote or attenuate skeletal muscle adaptations to endurance and strength training.
When taken together, it is clear that sports nutrition is very much at the heart of the Olympic motto, Citius, Altius, Fortius (faster, higher, stronger).

Monday, November 21, 2016

Exercise may not provide benefit over physical therapy after knee replacement

Exercise may not provide benefit over physical therapy after knee replacement

                     
In a randomized trial of patients who underwent total knee replacement as a treatment for osteoarthritis, a group program of strengthening and aerobic exercises was not better at alleviating long-term knee pain or overcoming activity limitations compared with usual care, which included physical therapy.

Although most patients experienced less knee pain and improved physical function after undergoing total knee replacement, marked deficits in physical performance measures remained 12 months later.
The findings are published in Arthritis Care & Research.
Source

Diet and exercise can improve kidney function in patients with fatty liver disease

Diet and exercise can improve kidney function in patients with fatty liver disease

                     
Non-alcoholic steatohepatitis (NASH) is a potentially serious liver condition characterized by excess fat in the liver associated with inflammation and scarring. NASH may progress to cirrhosis of the liver and liver cancer, and it can also compromise kidney function.

In a post hoc analysis of a large clinical trial, patients with biopsy-confirmed NASH who consumed a low-fat/low-calorie diet and participated in an exercise program often experienced reduced liver inflammation and scarring. Importantly, in patients whose liver disease improved, there was also an improvement in kidney function even after several adjustments by potential confounding factors such as diabetes, hypertension, concurrent medications and weight loss by itself.

“The exact mechanism to explain these findings have not yet been entirely elucidated; however, it may be a reflection of the improvement in oxidative stress, insulin sensitivity, inflammation, and vascular endothelial function and permeability that may contribute to positive changes in kidney function,” said Dr. Naga Chalasani, senior author of the Alimentary Pharmacology and Therapeutics analysis.
Source
 

Gut bacteria affect our metabolism

Gut bacteria affect our metabolism

     
Mice that receive gut bacteria transplants from overweight humans are known to gain more weight than mice transplanted with gut bacteria from normal weight subjects, even when the mice are fed the same diet. A study from the National Food Institute confirms this finding while seeking new perspectives on the reasons behind this link.

The human gut microbiota has repeatedly been linked to obesity.

In a new study, researchers from the National Food Institute transferred bacterial communities from 32 children and adolescents – half of which were owerweight and half within the normal weight range – into specially bred mice with no bacteria in their intestines. The researchers subsequently examined differences in weight gain and metabolism among the mice and compared these findings with the corresponding differences between the children, who had originally ‘donated’ the bacteria.
Same diet, different weight gain

”The study, in which we have used gut bacteria from children, confirms results from previous studies among adults, which have shown that mice colonized with gut bacteria from overweight people gain more weight than mice whose intestines are colonized by bacteria from people within the normal weight range – even though they eat the same diet,” Professor Tine Rask Licht from the National Food Institute explains.

The new study is based on a larger number of humans than previous similar studies. As such it is possible to compare each mouse with their ‘bacteria donor’ and to examine other differences between the donors which are potentially transferred to the mice. Additionally, the researchers have investigated how the spread of bacteria between individual mice affects their digestion/metabolism.
The study design is different than previous studies within this field and as such the researchers are able to obtain new observations related to the effect of gut microbes on host metabolism.
Bacterial composition affects metabolism

The National Food Institute study has measured a larger amount of unspent energy in faeces from mice with the smallest weight gain.

”The bacterial community in the intestine of mice with the smallest weight gain has been less capable of converting dietary fibre in the feed, which partly explains the difference in weight between the animals,” Tine Rask Licht says.

The study also shows that the gut bacterial composition affects a number of other measurements, which have to do with the ability of the mice to convert carbohydrates and fats, and which affect the development of diseases such as type 2 diabetes (e.g. levels of insulin and tryglycerides). However, it cannot be concluded that bacterial communities from the overweight children affects the mice in a specific direction e.g. in relation to the risk of developing type 2 diabetes.

Meanwhile, the study shows that the spread of bacteria from mouse to mouse, which occurs e.g. through the keeper’s handling, is enough to affect the measurements – and this is a completely new observation.

When interpreting studies such as this one it is important to keep in mind that not all gut bacteria from humans are able to establish themselves in the mouse intestine.
”The larger number of human ’bacteria donors’ in our study has given us a unique opportunity to follow which of the human-derived bacteria that generally colonize the mouse gut, and which don’t. This provides important insights for future research,” Tine Rask Licht explains.
Read more

The study has been carried out in cooperation with the Novo Nordisk Foundation Center for Basic Metabolic Research at University of Copenhagen as well as Holbæk Hospital. The hospital has provided faecal samples from 32 Danes aged 6-17 years that have been transplanted into 64 mice.
Read about the study in a scientific article in The ISME Journal: Environmental spread of microbes impacts the development of metabolic phenotypes in mice transplanted with microbial communities from humans (http://www.nature.com/ismej/journal/vaop/ncurrent/pdf/ismej2016151a.pdf). The Danish Council for Independent Research and Innovation Fund Denmark have partially funded the study, which is carried out a as a part of the Gut, Grain and Greens (3G – http://www.3g-center.dk/) research centre as well as the research projects BioChild (http://biochild.ku.dk/) and Target (http://metabol.ku.dk/research/research-project-sites/target/).

The National Food Institute’s Research Group for Gut Microbiology and Immunology studies the effects of diet and environment on the bacterial composition of the gut as well as how the microbial population affects the development of e.g. overweight and various diseases. Read more about the research group on the institute’s website (http://l.dtu.dk/m7tg). Also read the institute’s press release from 11 February 2016: Transition to family food determines infants’ gut bacteria

(http://l.dtu.dk/8fut).


Source

Thursday, November 17, 2016

Crawling is the new fitness fad

 
Danielle Johnson demonstrates how to crawl for exercise.On any given morning, as the sun peeks over the horizon, Danielle Johnson can be found crawling down the hallways of her Rochester, Minnesota, home.
It may sound bizarre, but Johnson crawls every day to strengthen her core muscle groups.
“You can crawl in many ways. You can crawl on your hands and knees. You can also prop up on your toes and just hover, one or two inches above the ground, which is really going to pull in those core muscles and work those muscles effectively,” said Johnson, a physical therapist at the Mayo Clinic Healthy Living Program.
“Then, as you start to move, you’re working on your shoulder girdle, you’re working on your hips,” she said. “If I could give one exercise to almost everybody, this would be it.

 

Danielle Johnson demonstrates how to crawl for exercise.

 
Crawling has been used as a physical therapy tool, Johnson said, and now it has been adopted for strengthening and fitness.

 

The idea of turning crawling like a baby into exercise has been championed by the training system Original Strength, which repurposes fundamental movements into a fitness regimen.
 

 

Monday, November 14, 2016

Skipping breakfast and not enough sleep can make children overweight

 





Mothers smoking in pregnancy, children skipping breakfast and not having a regular bedtime or sufficient sleep all appear to be important factors in predicting whether a child will become overweight or obese, according to new research led by UCL.

All three are early life factors which can be modified and the research highlights the possibility that prompt intervention could have an impact in curbing the growth in childhood overweight and obesity.
The paper, which was published in US journal Pediatrics, is the first research in the UK to look at the patterns of body mass index (BMI) weight development in the first 10 years of a child’s life and to examine the lifestyle factors that appear to predict weight gain.

Being overweight or obese is linked to a child having poorer mental health, which can extend into adolescence and adulthood. This poorer psychosocial well-being includes low self-esteem, unhappiness as well as risky behaviours such as cigarette smoking and alcohol consumption.
The research is based on the Millennium Cohort Study, a study of children born into 19,244 families in the UK between September 2000 and January 2002. Data on weight and height was collected when the children were 3, 5, 7 and 11.

This research used observational information which does not allow firm cause and effect conclusions to be drawn. However the results are based on data from thousands of children and the researchers were able to take account of many of the influences on the development of a child’s weight.
“It is well known that children of overweight or obese mothers are more likely to be overweight themselves, probably reflecting the ‘obesogenic’ environment and perhaps a genetic predisposition to gain weight,” said Professor Yvonne Kelly (UCL Epidemiology and Public Health), who led the research.

“This study shows that disrupted routines, exemplified by irregular sleeping patterns and skipping breakfast, could influence weight gain through increased appetite and the consumption of energy-dense foods. These findings support the need for intervention strategies aimed at multiple spheres of influence on BMI growth.”

Smoking in pregnancy has been linked to a higher risk of a child being overweight, possibly due to a link between foetal tobacco exposure and infant motor co-ordination which could be a developmental pathway to BMI growth.

The study identified four patterns of weight development. The large majority of children, 83.3%, had a stable non-overweight BMI, while 13.1% had moderate increasing BMIs while 2.5% had steeply increasing BMIs. The smallest group, 0.6%, had BMIs in the obese range at the age of 3 but were similar to the stable group by the age of 7.

Girls were more likely to be in the “moderately increasing” group while Pakistani, Black Caribbean and Black African children were more likely to belong to the “high increasing” group.

The research also looked at other factors to see what influence, if any, they had on children’s weight.
After taking account of background factors, breastfeeding and the early introduction of solid food were not associated with children’s weight. Likewise, sugary drink consumption, fruit intake, TV viewing and sports participation were not strong predictors of unhealthy weight gain.
###
The study was supported by a grant from the Economic and Social Research Council.
Source

Is osteoarthritis a metabolic disorder?

Is osteoarthritis a metabolic disorder?

     
Br Med Bull. 2015 Sep;115(1):111-21. doi: 10.1093/bmb/ldv028. Epub 2015 Jul 14.
Is osteoarthritis a metabolic disorder?

 Kluzek S1, Newton JL2, Arden NK3.

 Author information

1ARUK Sports, Exercise and Osteoarthritis Centre, University of Oxford, Oxford, UK Oxford NIHR Musculoskeletal Biomedical Research Unit, University of Oxford, Oxford, UK.
2ARUK Sports, Exercise and Osteoarthritis Centre, University of Oxford, Oxford, UK Oxford NIHR Musculoskeletal Biomedical Research Unit, University of Oxford, Oxford, UK The Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences (NDORMS), University of Oxford, Oxford OX3 7LD, UK julia.newton@ouh.nhs.uk.

3ARUK Sports, Exercise and Osteoarthritis Centre, University of Oxford, Oxford, UK Oxford NIHR Musculoskeletal Biomedical Research Unit, University of Oxford, Oxford, UK MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton, UK.

Abstract

BACKGROUND:

Obesity is associated with an increased risk of developing osteoarthritis (OA), even in non-weight bearing joints. High levels of adipose tissue-associated inflammation may explain this association.

SOURCES OF DATA AND AREAS OF DEBATE:

Published evidence looking at the associations between components of Metabolic Syndrome (MetS) and knee, hip or hand OA and the higher mortality described with knee OA.

EMERGING POINTS:

Development of MetS and OA shares a relationship with adipose tissue-associated inflammation. This review supports this inflammatory pathway being part of the shared mechanism behind obesity as a risk factor for OA and the recently described OA-associated increased mortality.

TIMELY AREAS FOR DEVELOPMENT:

In an era of an obesity epidemic, this review identifies a need for well-designed cohort studies assessing early metabolic changes in populations at high risk of OA and MetS, and to identify risk factors for increased mortality in patients with OA.

Source

Thursday, November 10, 2016

10 Tips to Avoid Weight Gain During the Holidays

10 Tips to Avoid Weight Gain During the Holidays





Newswise — The holiday season is officially in full gear and with it comes the tempting Thanksgiving-to-New-Year’s food fest. During the holiday season, good eating habits spiral out of control and exercise plans are thrown out the window resulting in undesired weight gain.
With a little self-control and a few simple adjustments to your traditional approach, you can still enjoy all of the highly-anticipated feasts without sabotaging your weight, said Kristen Kizer, a registered dietitian at Houston Methodist Hospital.

“Lack of sleep, an abundance of decadent food and the stress of the holidays are the perfect storm for weight gain,” she said. “Remind yourself how it feels to over eat and implement a personal wellness plan to get you through the holiday season without adding to your waistline.”

Kizer suggest these tips to maintain a healthy weight and still enjoy the holidays.

1. Sign up for a race after the holidays. Incorporating a race during the holidays like a turkey trot or jingle bell dash is great, but signing up for a walk or 5K in January can really motivate us to move during a time of the year when we’re quick to give ourselves an excuse to skip our exercise.

2. Eat breakfast. Instead of saving up all your calories for the big meal, eat a small but satisfying breakfast in the morning so you won’t be starving when you arrive. Be sure to include a protein-rich food item such as low-fat Greek yogurt.

3. Cut out the casserole. Between the fried onion strings, condensed soup, and canned beans, green bean casserole lacks nutritional value. Leave this unhealthy dish off the dinner table and replace it with something healthier. Try fresh steamed green beans with some low-fat cheese sprinkled on top or roasted green beans with a little olive oil and fresh garlic.

4. Eliminate the extra sweets. The Pilgrims did not add marshmallows to their sweet potatoes, and neither should you. Ditch the marshmallows and brown sugar, and enjoy the natural sweetness of the sweet potato.


5. Get plenty of sleep. Getting less than six hours of sleep a night causes cravings for starchy, sugary foods (hello frosted Santa-shaped cookies) and dissolves your resolve to make healthy food decisions. Most health experts recommend at least seven hours of sleep a night to feel fully rested.

6. Lighten your carb intake. Holiday meals are typically heavy in carbohydrates, so try reducing your carb consumption for the day by replacing mashed potatoes with mashed cauliflower. Your guests probably won’t even notice the difference.

7. Enjoy guilt-free dessert. Substitute natural applesauce for oil or butter in your dessert recipes. This simple ingredient swap not only adds moisture and flavor to baked goods, but fiber and nutrients.

8. Choose alcohol or dessert. Before going out to a party decide beforehand to treat yourself with either alcohol or dessert, but not both. If you choose dessert, limit yourself. When it’s time for dessert, pick one treat and enjoy it slowly. There is no need to try every sweet on the table. As for alcohol, choose a drink with lower calories, such as a wine spritzer instead of creamy holiday drinks that can easily pack 500 calories. And remember, moderation is key.

9. Prepare less food. Cut back on the amount of food you prepare for your guests. Instead of fourteen dishes, try pairing down to seven or eight dishes. By doing this you, you can save time and money and avoid eating leftovers for the several days following.

10. Skip the leftovers. It’s not the meal that gets us, it’s the fact that we then eat Thanksgiving for the next three days. Decline taking party leftovers or limit the number of dishes you prepare.

For more information about Houston Methodist, visit houstonmethodist.org. Follow us on Twitter and Facebook.

 -30-

Monday, November 7, 2016

12-Week Exercise Program Significantly Improved Testosterone Levels in Overweight, Obese Men

 



              
Phoenix (November 4, 2016)—Twelve weeks of aerobic exercise significantly boosted testosterone levels in overweight and obese men, with the greatest increases seen among vigorous exercisers, according to research presented today at the Integrative Biology of Exercise 7 meeting in Phoenix.
Researchers from Tsukuba University and Ryutsu Keizai University in Japan previously found that a combination of diet and exercise was effective in increasing the testosterone in this population. For this study, however, they looked specifically at the effect of regular aerobic exercise on testosterone levels.

“Testosterone is a male sex hormone, and low circulating testosterone levels lead to various health disorders in men. Obesity, one of the biggest problems in the world, results in reduction in circulating testosterone levels in men,” the research team wrote. Fatigue, decreased sex drive and decreases in muscle and bone mass are some of the common symptoms of low testosterone in men.

The research team compared 16 normal weight men to 28 overweight/obese men. None of the men were regular exercisers. At baseline, the overweight/obese men had significantly lower total, free and bioavailable testosterone level than normal weight men. All of the study volunteers completed a 12-week aerobic exercise plan that entailed 40–60 minutes of walking or jogging on one to three days per week. Testosterone levels were also recorded at the end of the study.

While their testosterone was still at lower levels than the normal weight men at baseline, overweight and obese men saw a significant increase in all measured testosterone levels. This effect was particularly evident among the men who exercised vigorously. However, the exercise intervention had no significant effect on testosterone levels in the normal weight men.

Normal Weight Men
Pre-Exercise InterventionPost-Exercise Intervention
Total Testosterone21.2 ± 1.3 nnol/l21.1 ± 1.3 nmol/l
Free Testosterone0.47 ± 0.04 nnol/l0.48 ± 0.05 nmol/l
Bioavailable Test.11.65 ± 0.76 nnol/l11.88 ± 1.11 nmol/l
Overweight/Obese Men
Pre-Exercise InterventionPost-Exercise Intervention
Total Testosterone15.4 ± 1.0 nnol/l18.1 ± 1.1 nmol/l
Free Testosterone0.33 ± 0.02 nnol/l0.40 ± 0.02 nmol/l
Bioavailable Test.8.07 ± 0.53 nnol/l9.63 ± 0.55 nmol/l
 
Body weight also significantly decreased following the exercise intervention in the overweight/obese cohort. “I think decrease in body mass is one of the factors for increasing serum testosterone levels,” said Hiroshi Kumagai, lead researcher on the study. “However, the degree of weight loss is small, and we found that the increase in vigorous physical activity was independently associated with the increase in serum testosterone levels. So, it seems the increase in physical activity, especially vigorous physical activity, is the main factor for increasing serum testosterone levels.”

Wednesday, October 12, 2016

DHA supplementation improves cognition in older adults with mild cognitive impairment

DHA supplementation improves cognition in older adults with mild cognitive impairment

     

Results from a recent study published in the Journal of Alzheimer’s Disease support the cognitive benefits of DHA, which have been consistently demonstrated with doses of 900 mg/day or greater. The study, which took place in Tianjin, China, was a randomized, double-blind, placebo-controlled trial in 240 (219 completed) Chinese individuals aged 65 and older with mild cognitive impairment. The participants received either 2g/day of DHA or a corn oil placebo for 12 months and specific measures of cognitive function were measured at baseline, six months and 12 months.

The study results showed that there was a significant difference in the Full-Scale Intelligence Quotient (IQ) in the DHA group versus placebo, with IQ in the DHA group measuring 10% higher than the placebo group. Additionally, there were statistically significant increases in two IQ sub-tests (Information and Digit Span). The Information and Digit Span Subdomains are considered indicators of long-term and short-term memory, respectively. The findings suggest that DHA supplementation of 2g/day for 12 months in MCI subjects can significantly improve cognitive function.

While additional larger longer-term studies are needed to confirm the results, this paper adds to the body of science supporting DHA omega-3s and their role in supporting cognitive function.
###
Abstract: http://content.iospress.com/articles/journal-of-alzheimers-disease/jad160439
Source

Wrist-worn heart rate monitors not as accurate as chest straps; JAMA

Wrist-worn heart rate monitors not as accurate as chest straps; JAMA


                


In a study published online by JAMA Cardiology, Marc Gillinov, M.D., of the Cleveland Clinic, and colleagues assessed the accuracy of 4 popular wrist-worn heart rate monitors under conditions of varying physical exertion.
Wrist-worn fitness and heart rate (HR) monitors are popular. While the accuracy of chest strap, electrode-based HR monitors has been confirmed, the accuracy of wrist-worn, optically based HR monitors is uncertain. Assessment of the monitors’ accuracy is important for individuals who use them to guide their physical activity and for physicians to whom these individuals report HR readings.
This study included 50 healthy adults; average age, 37 years; 28 participants were women. Participants wore standard electrocardiographic limb leads and a Polar H7 chest strap monitor. Each participant was randomly assigned to wear 2 different wrist-worn HR monitors. Four wrist-worn monitors were assessed: Fitbit Charge HR (Fitbit), Apple Watch (Apple), Mio Alpha (Mio Global), and Basis Peak (Basis). Heart rate was assessed with the participant on a treadmill at rest and at 2,3,4,5 and 6 mph. Participants exercised at each setting for 3 minutes to achieve a steady state; HR was recorded instantaneously at the 3-minute point. After completion of the treadmill protocol, HR was recorded at 30, 60, and 90 seconds’ recovery.
Across all devices, 1,773 HR values were recorded. When compared with electrocardiogram, the HR monitors had variable accuracy. While the Basis Peak overestimated HR during moderate exercise, the Fitbit Charge HR underestimated HR during more vigorous exercise. Analysis showed that variability occurred across the spectrum of midrange HRs during exercise. The Apple Watch and Mio Fuse had 95 percent of differences fall within -27 beats per minute (bpm) and +29 bpm of the electrocardiogram, while Fitbit Charge HR had 95 percent of values within -34 bpm and +39 bpm and the corresponding values for the Basis Peak were within -39 bpm and +33 bpm.

“We found variable accuracy among wrist-worn HR monitors; none achieved the accuracy of a chest strap-based monitor. In general, accuracy of wrist-worn monitors was best at rest and diminished with exercise,” the authors write.
“Electrode-containing chest monitors should be used when accurate HR measurement is imperative. While wrist-worn HR monitors are often used recreationally to track fitness, their accuracy varies; 2 of 4 monitors had suboptimal accuracy during moderate exercise. Because cardiac patients increasingly rely on these monitors to stay within physician-recommended, safe HR thresholds during rehabilitation and exercise, appropriate validation of these devices in this group is imperative.”
###
(JAMA Cardiology. Published online October 12, 2016; doi:10.1001/jamacardio.2016.3340. Available pre-embargo to the media at http://media.jamanetwork.com.)
Editor’s Note: The research was supported by The Mary Elizabeth Holdsworth Fund at the Cleveland Clinic. All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest and none were reported.
Source

 

Friday, October 7, 2016

Stem cell therapy for arthritis and cartilage damage

 
 
The science is still out on this fairly new revolutionary procedure.
 
By all accounts this should be God send for people suffering from
 
Arthritis and cartilage damage.
 
It is presently not covered by insurance.
 
The out of pocket can be anywhere between $3000-8000 per injection.
 
Hopefully with more studies down the road and refinement of the procedure,
 
it will be shown to be an effective non-invasive therapy for those currently suffering from pain.
 
 
Feel free to click on the link and read more for yourself.


Monday, September 19, 2016

Meal frequency and timing: impact on metabolic disease risk

 

     
Curr Opin Endocrinol Diabetes Obes. 2016 Oct;23(5):379-83. doi: 10.1097/MED.0000000000000280.
Meal frequency and timing: impact on metabolic disease risk.
Varady KA1.
Author information
1Department of Kinesiology and Nutrition, University of Illinois at Chicago, Chicago, Illinois, USA.
Abstract
PURPOSE OF REVIEW:
The purpose of this article is to provide an overview of the most recent human intervention trials that have examined the impact of meal frequency or meal timing on metabolic disease risk factors.
RECENT FINDINGS:
Findings from intervention studies published over the past 12 months indicate that weight loss may be more pronounced with decreased meal frequency (two meals per day) versus increased meal frequency (six meals per day) under hypocaloric conditions. However, under isocaloric conditions, no effect on body weight was noted. Plasma lipid concentrations and glucoregulatory factors (fasting glucose, insulin, and insulin sensitivity) were not affected by alterations in meal frequency. As for meal timing, delaying the lunchtime meal by 3.5 h (from 1.30 p.m. to 4.30 p.m.) has no impact on body weight, but may impair glucose tolerance in young healthy adults.
SUMMARY:
In sum, altering meal frequency has little impact on body weight, plasma lipids, or glucoregulatory factors, whereas eating the majority of calories later in the day may be detrimental for glycemic control. These preliminary findings, however, still require confirmation by longer term, larger scale controlled trials.

Wednesday, September 14, 2016

Eating Your Greens Could Enhance Sport Performance

 

     
Newswise — Nitrate supplementation in conjunction with Sprint Interval Training in low oxygen conditions could enhance sport performance a study has found.

Researchers from the University of Leuven in Belgium carried out a study with twenty-seven moderately trained participants. These were given nitrate supplements ahead of Sprint Interval Training (SIT), which took the form of short but intense cycling sessions three times a week.

Nitrate is commonly found in diets rich in leafy green foods, like spinach and is important for the functioning of the human body, especially during exercising.

To assess differences in performance in different conditions, the study included workouts in normal oxygen conditions and in hypoxia conditions, which are low oxygen levels such as those found in high altitudes.
The observations published in Frontiers in Physiology were unexpected: after only five weeks, the muscle fiber composition changed with the enhanced nitrate intake when training in low oxygen conditions.

“This is probably the first study to demonstrate that a simple nutritional supplementation strategy, i.e. oral nitrate intake, can impact on training-induced changes in muscle fiber composition;” stated Professor Peter Hespel from the Athletic Performance Center at the University of Leuven.

For athletes participating in sports competitions which require energy production in conditions with limited amounts of oxygen, this study is particularly interesting. In fact, exercising at high altitudes has become a training strategy for many athletes, albeit the uncertainties about such methods.

In these conditions, performing intense workouts requires high input of fast-oxidative muscle fibers to sustain the power. Enhancing these muscle fiber types through nutritional intake could very well boost the performance in this type of events.

However, this remains a question mark for the time being. “Whether this increase in fast-oxidative muscle fibers eventually can also enhance exercise performance remains to be established;” said Professor Hespel.

He cautioned: “consistent nitrate intake in conjunction with training must not be recommended until the safety of chronic high-dose nitrate intake in humans has been clearly demonstrated”.

 
In times where athletes push the limits of their bodies and thrive for ever greater performances, this is clearly only the beginning of the research into how athletes can improve their competitive edge through dietary supplements. Looking to the future, Professor Hespel suggested: “it would now be interesting to investigate whether addition of nitrate-rich vegetables to the normal daily sports diet of athletes could facilitate training-induced muscle fiber type transitions and maybe in the long term also exercise performance”.

Healthy diet boosts children’s reading skills

 

     
A heathy diet is linked to better reading skills in the first three school years, shows a recent study from Finland. Published in the European Journal of Nutrition, the study constitutes part of the Physical Activity and Nutrition in Children Study conducted at the University of Eastern Finland and the First Steps Study conducted at the University of Jyväskylä.

The study involved 161 children aged 6-8 years old, and followed up on them from the first grade to the third grade in school. The quality of their diet was analysed using food diaries, and their academic skills with the help of standardised tests. The closer the diet followed the Baltic Sea Diet and Finnish nutrition recommendations – i.e. high in vegetables, fruit and berries, fish, whole grain, and unsaturated fats and low in red meat, sugary products, and saturated fat – the healthier it was considered.

Nutrition & Diet Learning Charts

The study showed that children whose diet was rich in vegetables, fruit, berries, whole grain, fish and unsaturated fats, and low in sugary products, did better in tests measuring reading skills than their peers with a poorer diet quality.

The study also found that the positive associations of diet quality with reading skills in Grades 2 and 3 were independent of reading skills in Grade 1. These results indicate that children with healthier diets improved more in their reading skills from Grade 1 to Grades 2-3 than children with poorer diet quality.

“Another significant observation is that the associations of diet quality with reading skills were also independent of many confounding factors, such as socio-economic status, physical activity, body adiposity, and physical fitness,” says Researcher Eero Haapala, PhD, from the University of Eastern Finland and the University of Jyväskylä.

Parents, schools, governments and companies can improve the availability of healthy foods
A healthy diet seems to be an important factor in supporting learning and academic performance in children. By making healthy choices every meal, it is possible to promote a healthy diet and enhance diet quality. Parents and schools have an important role in making healthy foods available to children. Furthermore, governments and companies play a key role in promoting the availability and production of healthy foods.
###
The study was funded by the Jenny and Antti Wihuri Foundation and the Päivikki and Sakari Sohlberg Foundation.

Monday, September 12, 2016

New Clues Into How Meditation May Boost The Immune System

 

                   


Most people are aware of the fact that meditation, in its many forms, can tweak the brain and body in a number of beneficial ways. It’s been shown to increase volume in certain brain regions, to reduce anxiety and depression, and even to improve immunity. Of course, exactly how meditation is doing all these things isn’t totally understood. But a new study, in the journal Translational Psychiatry, helps suss out the molecular mechanisms behind meditation’s effects on the immune system. And it turns out that the effects are more than from just the relaxation element – there seems to be something intrinsic about meditation itself that can shift gene expression and even boost mood over time.

In the new study, the team of researchers from the Icahn School of Medicine at Mount Sinai, University of California at San Francisco, and Harvard Medical School had 94 women come to the Chopra Center for Well Being in California. Half of the women went in for a six-day vacation retreat, the half for a six-day meditation retreat. Neither of these groups of women had any experience with meditation – but a third group, made up of 30 experienced meditators also visiting the Center, were also studied. The team took blood samples from the participants, so they could analyze what genes were expressed, before the retreat, directly after it, one month, and 10 months later.

More

Men’s hidden body fat fears fueling gym attendance

 

     
Men’s hidden fears about body fat are fuelling gym attendance motivated by feelings of guilt and shame rather than a desire to build muscle, new research has shown.

Psychology researchers from the UK and Australia discovered that while male attitudes towards muscle or body mass index (BMI) did not predict how frequently they would attend the gym, their perceptions of body fat did.

The researchers found that men worried about body fat were more likely than others to undertake spontaneous, unplanned work-outs – and warned that these ‘sporadic’ exercise patterns tend to be difficult to sustain over time.

The findings raise questions over the effect portrayals of the ‘ideal body’ online and in the media have on healthy exercise behaviours in an era of ‘selfies’. This has important real-life implications for health and exercise professionals and their intervention programmes, the researchers suggest.

The study is the first of its kind to examine men’s body attitudes alongside both their conscious (explicit) and non-conscious (implicit) motivations for attending the gym. The findings could help health and fitness professionals improve gym attendance in the long-term by focusing on pro-active goal-setting and personal autonomy, rather than body image.

The study was carried out by Dr David Keatley from the School of Psychology at the University of Lincoln, UK, and Kim Caudwell from Curtin University, Australia.

Dr Keatley, a specialist in the study of complex patterns of behaviour and motivation, said: “Coaches, trainers, and even ‘gym buddies’ need to be aware of individuals’ motivations and reasons for attending a gym. Spontaneous gym goers are more likely to be motivated by guilt, shame or pressure, so it’s important to turn this around and place a focus on positive feelings of achievement and pride, fostering a long-term healthier behaviour change.

“Anyone can be affected by what they see online, the social cues images can give, and the popular conceptions of an ‘ideal body image’. With the recent growth of ‘selfies’ and the return of muscle-bound Hollywood hero icons like Vin Diesel and Hugh Jackman, there’s a real risk that males may be more influenced to attend the gym more regularly and workout to a point where it becomes dangerous or detracts from their wellbeing.

“This study is important in showing that whilst they may be more unlikely to admit it, body dissatisfaction and dysmorphia can and do affect males as well as females, and therefore should be investigated fully.”

To assess their motivations for exercising, 100 men completed a self-report questionnaire and a second test which evaluated their non-conscious motivation by measuring how long it took them to associate particular words with themselves.

All participants had a slightly elevated BMI and said they work out for around an hour, two or three times a week. Nearly 60 per cent of the men listed health and fitness as their primary reason for attending a gym or fitness activity. Just 16 per cent labelled appearance or amateur body building as their motivation, and eight per cent said training or competing was their main focus.

Participants responded to a series of statements about body image, for example “seeing my reflection makes me feel bad about my body fat and muscularity”. They also evaluated a series of statements about their motivation, such as “I feel under pressure to exercise or work out regularly from people I know well”. These were scored on a scale from one to four, with one being not very true and four being very true.

To examine hidden, non-conscious motivations, the researchers also asked participants to complete an Implicit Association Test (IAT), a task designed to assess automatic associations. It paired positive and negative feelings about exercising, such as ‘spontaneous’ and ‘willing’ or ‘restricted’ and ‘forced’, with words relating to the self and others, such as ‘me’ and ‘mine’ or ‘they’ and ‘theirs’.
The study is published in the Journal of Strength and Conditioning Research.


Tuesday, September 6, 2016

In COPD patients, physical activity reduces anxiety and depression: European Lung Foundation

 

                    

A study presented today (5 September, 2016) at this year’s European Respiratory Society (ERS) International Congress in London shows that increased physical activity among patients with chronic obstructive pulmonary disease (COPD) reduces their risk of anxiety or depression. The study is by Drs Milo Puhan, Anja Frei, and Tsung Yu, University of Zurich, Switzerland, and Dr Gerben ter Riet, University of Amsterdam, the Netherlands.
Comorbidities (other health conditions) are highly prevalent in patients with COPD. Low physical activity (PA), a critical feature of COPD, is believed to be an important risk factor for comorbidities. In this new study, the authors assessed the association of PA with incidence of 7 categories of comorbidities in COPD.

The study included 409 patients from primary care practice in the Netherlands and Switzerland. The researchers assessed PA using the Longitudinal Ageing Study Amsterdam Physical Activity Questionnaire at baseline and followed patients for up to 5 years. During follow-up, patients reported their comorbidities (cardiovascular, neurological, hormonal, musculoskeletal, cancer, and infectious diseases) and completed the Hospital Anxiety and Depression Scale questionnaire for mental health assessment.

The results suggested that higher levels of PA at baseline were associated with an 11% reduced risk of developing anxiety over the next 5 years, and a 15% reduced risk of becoming depressed. The researchers did not observe statistically significant associations of PA with the other categories of comorbidities.

The authors conclude: “In COPD patients, those with high PA are less likely to develop depression or anxiety over time. PA promotion programs may be considered to lower the burden of mental disorders in COPD patients.”

They add: “These findings have particular significance since mental disorders are common in patients with COPD. The prevalence of depression and anxiety is approximately 40% in COPD patients while the corresponding figure is less than 10% in the general population.”

Source
 

Basic pushup technique gets fine-tuned

 

     
BMC Musculoskelet Disord. 2015 Feb 10;16:23. doi: 10.1186/s12891-015-0486-5.

The effects of exercise type and elbow angle on vertical ground reaction force and muscle activity during a push-up plus exercise.
San Juan JG1, Suprak DN2, Roach SM3, Lyda M4.

Author information

1Department of Physical Education, Health and Recreation, Western Washington University, Bellingham, WA, USA. jun.sanjuan@gmail.com.
2Department of Physical Education, Health and Recreation, Western Washington University, Bellingham, WA, USA. dave.suprak@wwu.edu.
3Western Institute of Neuromechanics, Eugene, OR, USA. tensegrity1@msn.com.
4Western Institute of Neuromechanics, Eugene, OR, USA. mhlyda@msn.com.

Abstract

BACKGROUND:

Proper alignment of the scapula during upper extremity motion is important in maintaining shoulder joint function and health. Push-up plus exercise is considered as one of the best exercise to strengthen the muscles that stabilize the scapula. The purpose of the study is to examine the effects of push-up plus variants and elbow position on vertical ground reaction force and electromyographical activity of four shoulder muscles during concentric contraction.

METHODS:

A total of 22 healthy subjects volunteered for the study. Each of the subjects performed both modified and traditional push-up plus. Modified push-up plus was performed with both knees and hands touching the ground while the traditional push-up plus was executed with hands and feet contacting the ground. Electromyography (EMG) of the upper trapezius (UT), lower trapezius (LT), infraspinatus (INFRA), and serratus anterior (SA), and vertical ground reaction forces (vGRF) were collected.

RESULTS:

The traditional push-up plus exhibited higher EMG activity in all muscles tested (P < .05) and vertical ground reaction force (P < .001) compared to modified push-up plus. The highest difference in EMG activity between the two exercises was observed with the Serratus Anterior muscle (22%). Additionally, the traditional push-up plus presented a higher vGRF compared to the modified push-up plus (P < .001) by 17%. The SA had the greatest EMG activity compared to the other muscles tested during the concentric phase of the traditional push-up plus, and this did not occur during the plus phase of the exercise.



CONCLUSION:

 
The highest activity of the serratus anterior occurred at 55° of elbow extension during the concentric phase of the traditional PUP and not at the plus phase of the exercise. This suggests that when prescribing an exercise to target the serratus anterior, a traditional push-up is adequate and the plus-phase is not necessary. However, for patients that cannot perform a traditional push-up, the modified push-up plus would be a great alternative to strengthen their serratus anterior.

Extended Rest Between Weight Lifting Sets Could Help Muscle Growth: New Data

 

Newswise — Researchers from the University of Birmingham have found that extended rest intervals between sets of weight-lifting could help with muscle growth.
The findings, published in Experimental Physiology, go against the conventional belief that favours shorter periods of rest. The study highlights that short rest intervals may actually impair the processes that control muscle growth.

16 males completed resistance exercises interspersed by either one minute or five minutes of rest. Muscle biopsies were obtained at 0, 4, 24 and 28 hours post-exercise and analysed to determine myofibrillar protein synthesis (MPS) and intercellular signalling.

In the early part of recovery, the increase in MPS from resting levels was two-fold greater in those with longer rest periods. They saw a 152% increase, versus 76% increase in those with short rest intervals.

Dr Leigh Breen, from the University of Birmingham, explained, “With short rests of one minute, though the hormonal response is superior, the actual muscle response is blunted. If you’re looking for maximised muscle growth with your training programme, a slightly longer interval between sets may provide a better chance of having the muscle response you’re looking for.”

The team recommend that novices starting out on weight training programs should take sufficient rest, of at least 2-3 minutes, between weight lifting sets.

Dr Breen added, “Over time, they may need to find ways to push beyond the plateau of muscle building that commonly occurs, and so may gradually decrease their rest periods. For experienced lifters, it’s possible that they may not experience the same blunted muscle building response to short rest intervals, particularly if they have trained this way for a prolonged period and adapted to this unique metabolic stress. Nonetheless, similar recommendations of 2-3 minutes between sets should help to ensure maximal muscle growth in well trained individuals”.

The research team are currently following up the investigation with a longer term study to see effects over a number of months, and further research into how individuals can maximise their training outcomes by manipulating variables, such a rest, in their training.

The paper ‘Short Inter-Set Rest Blunts Resistance Exercise-Induced Increases in Myofibrillar Protein Synthesis and Intracellular Signaling in Young Males.’ (doi: 10.1113/EP085647), was accepted in Experimental Physiology and published online on 29 April 2016.