Improvement of Sprint Performance in Wheelchair Sportsmen With Caffeine Supplementation.

Autor:	Graham-Paulson, Terri S., Perret, Claudio, Watson, Phil, Goosey-Tolfrey, Victoria L.
Předmět:	EXERCISE SALIVA analysis AFFECT (Psychology) ANALYSIS of variance ANTHROPOMETRY AROUSAL (Physiology) SPORTS nutrition ATHLETIC ability CAFFEINE CROSSOVER trials EXERCISE physiology EXERCISE tests PHYSICAL fitness ATHLETES with disabilities PROBABILITY theory RUGBY football STATISTICAL sampling STATISTICS T-test (Statistics) TIME WHEELCHAIR sports DATA analysis ERGOGENIC aids RANDOMIZED controlled trials REPEATED measures design BLIND experiment EXERCISE intensity DATA analysis software DESCRIPTIVE statistics FRIEDMAN test (Statistics)
Zdroj:	International Journal of Sports Physiology & Performance; Mar2016, Vol. 11 Issue 2, p214-220, 7p, 1 Diagram, 2 Charts, 3 Graphs
Abstrakt:	Purpose: Caffeine can be beneficial during endurance and repeated-sprint exercise in able-bodied individuals performing leg or wholebody exercise. However, little evidence exists regarding its effects during upper-body exercise. This study therefore aimed to investigate the effects of caffeine on sprint (SPR) and 4-min maximal-push (PUSH) performance in wheelchair sportsmen. Methods: Using a double-blind, placebo-controlled, crossover design, 12 male wheelchair rugby players (age 30.0 ± 7.7 y, body mass 69.6 ± 15.3 kg, training 11.1 ± 3.5 h/wk) completed 2 exercise trials, separated by 7-14 d. 70 min after ingestion of 4 mg/kg caffeine (CAF) or dextrose placebo (PLA). Each trial consisted of four 4-min PUSHes and 3 sets of 3 x 20-m SPRs, each separated by 4 min rest. Participants responded to the Felt Arousal (a measure of perceived arousal), Feeling (a measure of the affective dimension of pleasure/displeasure), and rating-of-perceived-exertion (RPE) scales. Salivary caffeine secretion rates were measured. Results: Average SPR times were faster during CAF than PLA during SPR 1 and SPR 2 (P = .037 and .016). There was no influence of supplementation on PUSHes 2-4 (P > .099); however, participants pushed significantly farther during PUSH 1 after CAF than after PLA (mean ± SD 677 ± 107 and 653 ± 118 m, P - .047). There was no influence of CAF on arousal or RPE scores (P > . 132). Feeling scores improved over the course of the CAF trial only (P = .017) but did not significantly differ between trials (P > .167). Pre-warm-up (45 min postingestion) salivary CAF secretion rates were 1.05 ± 0.94 and 0.08 ± 0.05 pg/min for CAF and PLA, respectively. Conclusion: Acute CAF supplementation can improve both 20-m-sprint performance and a 1-off bout of short-term endurance performance in wheelchair sportsmen. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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