Caffeine consumption around an exercise bout: effects on energy expenditure, energy intake, and exercise enjoyment.
Schubert MM1, Hall S2, Leveritt M3, Grant G2, Sabapathy S2, Desbrow B2.
Author information
1Griffith University m.schubert@griffith.edu.au.
2Griffith University.
3The University of Queensland.
Abstract
Combining an exercise and nutritional intervention is arguably the optimal method of creating energy imbalance for weight loss.
This study sought to determine if combining exercise and caffeine supplementation was more effective for promoting acute energy deficits and manipulations to substrate metabolism than exercise alone.
Fourteen recreationally-active participants (Mean ± SD BMI: 22.7 ± 2.6 kg∙m-2) completed a resting control trial (CON), a placebo exercise trial (EX), and a caffeine exercise trial (EX+CAF, 2x 3 mg∙kg-1 of caffeine 90 min before and 30 min after exercise) in a randomized, double-blinded design.
Gas exchange, appetite perceptions, and blood samples were obtained periodically.
Two hours after exercise, participants were offered an ad libitum test meal where energy and macronutrient intake were recorded.
EX+CAF resulted in significantly greater energy expenditure and fat oxidation compared to EX (+250 kJ; +10.4 g) and CON (+3126 kJ; +29.7 g) (P < 0.05).
A trend for reduced energy and fat intake compared to CON (-718 kJ; -8 g) (P = 0.055) was observed.
Consequently, EX+CAF created a greater energy deficit (P < 0.05).
Caffeine also led to exercise being perceived as less difficult and more enjoyable (P < 0.05).
Combining caffeine with exercise creates a greater energy deficit and the implications of this protocol for weight loss or maintenance over longer time periods in overweight/obese populations require further investigation.
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