Effect of caffeine ingestion after creatine supplementation on intermittent high-intensity sprint performance.
Study Goal
The researchers aimed to determine whether acute caffeine ingestion enhances intermittent high-intensity sprint performance following creatine loading.
Results Summary
Caffeine ingestion after creatine supplementation significantly increased mean and peak power during sprints compared to placebo and control trials, with elevated heart rates, lactate, and glucose levels, but no differences in perceived exertion.
Population
Twelve physically active men.
Effective Dosage
6 mg/kg of caffeine administered once after creatine loading.
Duration
5 days of creatine loading followed by acute caffeine ingestion.
Interactions
None mentioned.
| Intervention | Direction | Endpoint | Population | Dosage | Impact | Claim # |
|---|---|---|---|---|---|---|
CRE + CAF (0.3 g kg(-1) day(-1) of creatine for 5 days and followed by 6 mg kg(-1) of caffeine) | increase | mean power | twelve physically active men | - | were significantly higher than | #1 |
CRE + CAF (0.3 g kg(-1) day(-1) of creatine for 5 days and followed by 6 mg kg(-1) of caffeine) | increase | peak power | twelve physically active men | - | were significantly higher than | #2 |
CRE + CAF (0.3 g kg(-1) day(-1) of creatine for 5 days and followed by 6 mg kg(-1) of caffeine) | increase | mean power | twelve physically active men | - | showed significantly higher | #3 |
CRE + CAF (0.3 g kg(-1) day(-1) of creatine for 5 days and followed by 6 mg kg(-1) of caffeine) | increase | peak power | twelve physically active men | - | showed significantly higher | #4 |
CRE + PLA (0.3 g kg(-1) day(-1) of creatine for 5 days then followed by 6 mg kg(-1) of placebo) | increase | mean power | twelve physically active men | - | was significantly greater than | #5 |
CRE + PLA (0.3 g kg(-1) day(-1) of creatine for 5 days then followed by 6 mg kg(-1) of placebo) | increase | peak power | twelve physically active men | - | was significantly greater than | #6 |
CRE + CAF (0.3 g kg(-1) day(-1) of creatine for 5 days and followed by 6 mg kg(-1) of caffeine) | increase | heart rates | twelve physically active men | - | increased significantly | #7 |
CRE + CAF (0.3 g kg(-1) day(-1) of creatine for 5 days and followed by 6 mg kg(-1) of caffeine) | increase | plasma lactate | twelve physically active men | - | increased significantly | #8 |
CRE + CAF (0.3 g kg(-1) day(-1) of creatine for 5 days and followed by 6 mg kg(-1) of caffeine) | increase | glucose | twelve physically active men | - | increased significantly | #9 |
caffeine ingestion after creatine supplements | increase | intermittent high-intensity sprint performance | twelve physically active men | - | augmented | #10 |
- | no change | RPE (rating of perceived exertion) | twelve physically active men | no significant change | No significant differences were observed | #11 |
The aim of this study was to investigate the effects of acute caffeine ingestion on intermittent high-intensity sprint performance after 5 days of creatine loading. After completing a control trial (no ergogenic aids, CON), twelve physically active men were administered in a double-blind, randomized crossover protocol to receive CRE + PLA (0.3 g kg(-1) day(-1) of creatine for 5 days then followed by 6 mg kg(-1) of placebo) and CRE + CAF (0.3 g kg(-1) day(-1) of creatine for 5 days and followed by 6 mg kg(-1) of caffeine), after which they performed a repeated sprint test. Each test consisted of six 10-s intermittent high-intensity sprints on a cycling ergometer, with 60-s rest intervals between sprints. Mean power, peak power, rating of perceived exertion (RPE), and heart rates were measured during the test. Blood samples for lactate, glucose, and catecholamine concentrations were drawn at specified intervals. The mean and peak power observed in the CRE + CAF were significantly higher than those found in the CON during Sprints 1 and 3; and the CRE + CAF showed significantly higher mean and peak power than that in the CRE + PLA during Sprints 1 and 2. The mean and peak power during Sprint 3 in the CRE + PLA was significantly greater than that in the CON. Heart rates, plasma lactate, and glucose increased significantly with CRE + CAF during most sprints. No significant differences were observed in the RPE among the three trials. The present study determined that caffeine ingestion after creatine supplements augmented intermittent high-intensity sprint performance.