Caffeine, but Not Creatine, Improves Anaerobic Power Without Altering Anaerobic Capacity in Healthy Men During a Wingate Anaerobic Test.
Study Goal
The researchers aimed to determine the effects of combined and isolated caffeine and creatine supplementation on anaerobic power and capacity.
Results Summary
Caffeine ingestion increased peak anaerobic power but had no effect on mean power or anaerobic capacity. Creatine supplementation did not significantly impact anaerobic power or capacity.
Population
24 healthy men
Effective Dosage
5 mg/kg of body mass (caffeine)
Duration
8 days
Interactions
None mentioned
| Intervention | Direction | Endpoint | Population | Dosage | Impact | Claim # |
|---|---|---|---|---|---|---|
creatine (CRE) supplementation | increase | body mass | healthy men | +0.87 ± 0.23 kg | changes in body mass were greater | #1 |
placebo (maltodextrin) | increase | body mass | healthy men | +0.13 ± 0.27 kg | changes in body mass were | #2 |
caffeine (CAF) | increase | peak power | healthy men | 1,033.4 ± 209.3 W | peak power was higher | #3 |
placebo (cellulose) | increase | peak power | healthy men | 1,003.3 ± 204.4 W | peak power was | #4 |
caffeine (CAF) | no change | mean power | healthy men | - | mean power was not different | #5 |
placebo (cellulose) | no change | mean power | healthy men | - | mean power was not different | #6 |
caffeine (CAF) | increase | anaerobic power | healthy men | - | increases | #7 |
creatine (CRE) | no change | anaerobic power | healthy men | - | not | #8 |
creatine (CRE) | no change | anaerobic capacity | healthy men | - | has no effect | #9 |
caffeine (CAF) | no change | anaerobic capacity | healthy men | - | has no effect | #10 |
There is a lack of evidence on the additional benefits of combining caffeine (CAF) and creatine (CRE) supplementation on anaerobic power and capacity. Thus, the aim of the present study was to test the effects of combined and isolated supplementation of CAF and CRE on anaerobic power and capacity. Twenty-four healthy men performed a baseline Wingate anaerobic test and were then allocated into a CRE (n = 12) or placebo (PLA; n = 12) group. The CRE group ingested 20 g/day of CRE for 8 days, while the PLA group ingested 20 g/day of maltodextrin for the same period. On the sixth and eighth days of the loading period, both groups performed a Wingate anaerobic test 1 hr after either CAF (5 mg/kg of body mass; CRE + CAF and PLA + CAF conditions) or PLA (5 mg/kg of body mass of cellulose; CRE + PLA and PLA + PLA conditions) ingestion. After the loading period, changes in body mass were greater (p < .05) in the CRE (+0.87 ± 0.23 kg) than in the PLA group (+0.13 ± 0.27 kg). In both groups, peak power was higher (p = .01) in the CAF (1,033.4 ± 209.3 W) than in the PLA trial (1,003.3 ± 204.4 W), but mean power was not different between PLA and CAF trials (p > .05). In conclusion, CAF, but not CRE ingestion, increases anaerobic power. Conversely, neither CRE nor CAF has an effect on anaerobic capacity.