Dietary Caffeine and Polyphenol Supplementation Enhances Overall Metabolic Rate and Lipid Oxidation at Rest and After a Bout of Sprint Interval Exercise.
Study Goal
The researchers aimed to investigate the effects of a caffeine-polyphenol supplement on metabolic rate, fat oxidation at rest and after sprint interval exercise (SIE), and SIE performance.
Results Summary
The caffeine-polyphenol supplement significantly increased energy expenditure, VO2, and fat oxidation at rest and post-SIE compared to placebo, but did not improve SIE performance. Post-SIE heart rate was higher with the supplement, but no differences were observed in blood pressure or power output during sprints.
Population
12 subjects (11 male, 1 female) with an average body mass of 76.1 kg, height of 169.8 cm, BMI of 22.7, and body fat percentage of 21.6%.
Effective Dosage
Not specified in the abstract.
Duration
2 testing sessions after an initial familiarization visit.
Interactions
None mentioned.
| Intervention | Direction | Endpoint | Population | Dosage | Impact | Claim # |
|---|---|---|---|---|---|---|
caffeine-polyphenol supplement | increase | energy expenditure at rest | 12 subjects (male: n = 11; female: n = 1) | +7.99% | resulted in significantly greater | #1 |
caffeine-polyphenol supplement | increase | energy expenditure post-SIE | 12 subjects (male: n = 11; female: n = 1) | +10.16% | resulted in significantly greater | #2 |
caffeine-polyphenol supplement | increase | V[Combining Dot Above]O2 at rest | 12 subjects (male: n = 11; female: n = 1) | +9.64% | resulted in significantly greater | #3 |
caffeine-polyphenol supplement | increase | V[Combining Dot Above]O2 post-SIE | 12 subjects (male: n = 11; female: n = 1) | +12.10% | resulted in significantly greater | #4 |
caffeine-polyphenol supplement | increase | fat oxidation rate at rest | 12 subjects (male: n = 11; female: n = 1) | +10.60% | resulted in significantly greater | #5 |
caffeine-polyphenol supplement | increase | fat oxidation rate post-SIE | 12 subjects (male: n = 11; female: n = 1) | +9.76% | resulted in significantly greater | #6 |
caffeine-polyphenol supplement | no change | peak and average power at all sprint intervals | 12 subjects (male: n = 11; female: n = 1) | no significant change | No significant differences were detected for | #7 |
caffeine-polyphenol supplementation | increase | Post-SIE HR | 12 subjects (male: n = 11; female: n = 1) | 90.8 ± 3.5 vs. 85.1 ± 3.6 b·min | was significantly greater | #8 |
caffeine-polyphenol supplement | no change | BP | 12 subjects (male: n = 11; female: n = 1) | no significant change | There were no significant between-treatment differences for | #9 |
Jo, E, Lewis, KL, Higuera, D, Hernandez, J, Osmond, AD, Directo, DJ, and Wong, M. Dietary caffeine and polyphenol supplementation enhances overall metabolic rate and lipid oxidation at rest and after a bout of sprint interval exercise. J Strength Cond Res 30(7): 1871-1879, 2016-The purpose of this study was to investigate the effects of a caffeine-polyphenolic supplement on (a) metabolic rate and fat oxidation at rest and after a bout of sprint interval exercise (SIE) and (b) SIE performance. In a double-blind, randomized, placebo-controlled, crossover study and after an initial familiarization visit, 12 subjects (male: n = 11; female: n = 1) (body mass = 76.1 ± 2.2 kg; height = 169.8 ± 1.6 cm; body mass index = 22.7 ± 3.0 kg·m; body fat % = 21.6 ± 2.0%) underwent 2 testing sessions during which time they consumed either a caffeine-polyphenol supplement or placebo. After supplementation, resting energy expenditure, heart rate (HR), and blood pressure (BP) were assessed. Subsequently, subjects performed 30 minutes of SIE while researchers collected performance data. Subjects were then tested for post-SIE energy expenditure, HR, and BP. The caffeine-polyphenol treatment resulted in significantly (p ≤ 0.05) greater energy expenditure (+7.99% rest; +10.16% post-SIE), V[Combining Dot Above]O2 (+9.64% rest; +12.10% post-SIE), and fat oxidation rate (+10.60% rest; +9.76% post-SIE) vs. placebo at rest and post-SIE. No significant differences were detected for peak and average power at all sprint intervals between treatments. Post-SIE HR was significantly (p ≤ 0.05) greater with caffeine-polyphenol supplementation vs. placebo (90.8 ± 3.5 vs. 85.1 ± 3.6 b·min). There were no significant between-treatment differences for BP. It may be concluded that the observed thermogenic response after SIE was directly attributable to caffeine-polyphenol supplementation as opposed to an indirect manifestation of enhanced performance and work output. Collectively, these results corroborate the use of dietary caffeine and polyphenols to support efforts to reduce adiposity and improve overall body composition especially in conjunction with SIE.