Acute effects of caffeine supplementation on resistance exercise, jumping, and Wingate performance: no influence of habitual caffeine intake

European Journal of Sport Science
Q1
Aug 2020
Citations:41
Influential Citations:3
Interventional (Human) Studies
82
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Enhanced Details

Methods
Randomized, double-blind, counterbalanced design with four sessions (two familiarization). 24 resistance-trained males participated; age not reported; no dropouts.
Intervention
One capsule per session containing caffeine (3 mg/kg body weight) or placebo (dextrose, 3 mg/kg) taken 60 minutes before exercise; four sessions separated by 4–7 days; sessions conducted in a fasted state.
Results
Acute caffeine ingestion (3 mg/kg) produced significant ergogenic effects across resistance exercise, jumping, and Wingate performance versus placebo. Bench-press velocity increased by 0.02–0.08 m/s and power by 42–156 W; muscular endurance improved by about 1.2 additional repetitions; countermovement jump height increased by about 0.9 cm; Wingate peak power increased by 31–75 W. Effects favored caffeine with small-to-large effect sizes (0.14–0.97). No significant group × condition interactions; habitual caffeine intake did not correlate with changes, and did not alter caffeine response between low and moderate-to-high habitual users. Conclusion: habitual caffeine intake might not negate the acute ergogenic effects of caffeine on these exercises at 3 mg/kg.
Limitations
Small, homogeneous sample (24 young, resistance-trained men) limits generalizability to women and older adults; habitual caffeine intake estimated by FFQ with potential recall bias and beverage-caffeine variability; coarse dichotomization (<165 mg/day vs ≥165 mg/day) may miss nuances; partial unblinding observed; short-term, four-session design; no dose–response assessment or long-term habituation data.

Abstract

Abstract This study explored the influence of habitual caffeine intake on the acute effects of caffeine ingestion on resistance exercise, jumping, and Wingate performance. Resistance-trained males were tested following the ingestion of caffeine (3 mg...