The dose-dependent effect of caffeine supplementation on performance, reaction time and postural stability in CrossFit - a randomized placebo-controlled crossover trial.
Study Goal
The researchers aimed to evaluate the dose-dependent effects of acute caffeine supplementation on specific performance and cognitive functions in CrossFit practitioners.
Results Summary
The study found that caffeine supplementation at 6 mg/kg body mass showed limited but clinically considered improvements in performance and reaction time, though the changes were statistically nonsignificant. Higher doses did not demonstrate clear additional benefits.
Population
26 moderately trained CrossFit practitioners
Effective Dosage
3, 6, or 9 mg/kg body mass (acute pre-exercise supplementation)
Duration
Acute (single-dose intervention)
Interactions
None mentioned
| Intervention | Direction | Endpoint | Population | Dosage | Impact | Claim # |
|---|---|---|---|---|---|---|
Caffeine (CAF) ingestion | increase | performance in a broad range of exercise tasks | - | - | improves | #1 |
acute supplementation of three different doses of CAF and placebo (PLA) | neutral | specific performance, reaction time | CrossFit/High-Intensity Functional Training (HIFT) | - | effect | #2 |
Supplementation of 6 mg/kg body mass (BM) CAF | increase | specific performance | 26 moderately trained CrossFit practitioners | - | improved | #3 |
Supplementation of 6 mg/kg body mass (BM) CAF | increase | R (reaction time) | 26 moderately trained CrossFit practitioners | - | improved | #4 |
CAF supplementation | neutral | specific performance, R (reaction time) | - | statistically nonsignificant but clinically considered changes | dose-dependent effect | #5 |
BACKGROUND: Caffeine (CAF) ingestion improves performance in a broad range of exercise tasks. Nevertheless, the CAF-induced, dose-dependent effect on discipline-specific performance and cognitive functions in CrossFit/High-Intensity Functional Training (HIFT) has not been sufficiently investigated. The aim of this study was to evaluate the effect of acute supplementation of three different doses of CAF and placebo (PLA) on specific performance, reaction time (R METHODS: In a randomized double-blind placebo-controlled crossover design, acute pre-exercise supplementation with CAF (3, 6, or 9 mg/kg body mass (BM)) and PLA in 26 moderately trained CrossFit practitioners was examined. The study protocol involved five separate testing sessions using the Fight Gone Bad test (FGB) as the exercise performance evaluation and biochemical analyses, HR and RPE monitoring, as well as the assessment of R RESULTS: Supplementation of 6 mg CONCLUSIONS: The dose-dependent effect of CAF supplementation appears to be limited to statistically nonsignificant but clinically considered changes on specific performance, R