PMID: 22349085Feb 22, 2012Paper

Acute caffeine ingestion's increase of voluntarily chosen resistance-training load after limited sleep

International Journal of Sport Nutrition and Exercise Metabolism
Christian CookScott Drawer

Abstract

This study aimed to determine whether caffeine ingestion would increase the workload voluntarily chosen by athletes in a limited-sleep state. In a double-blind, crossover study, 16 professional rugby players ingested either a placebo or 4 mg/kg caffeine 1 hr before exercise. Athletes classified themselves into nondeprived (8 hr+) or sleep-deprived states (6 hr or less). Exercise comprised 4 sets of bench press, squats, and bent rows at 85% 1-repetition maximum. Athletes were asked to perform as many repetitions on each set as possible without failure. Saliva was collected before administration of placebo or caffeine and again before and immediately after exercise and assayed for testosterone and cortisol. Sleep deprivation produced a very large decrease in total load (p = 1.98 × 10(-7)). Caffeine ingestion in the nondeprived state resulted in a moderate increase in total load, with a larger effect in the sleep-deprived state, resulting in total load similar to those observed in the nondeprived placebo condition. Eight of the 16 athletes were identified as caffeine responders. Baseline testosterone was higher (p < .05) and cortisol trended lower in non-sleep-deprived athletes. Changes in hormones from predose to preexercise corr...Continue Reading

Citations

Nov 22, 2017·Sports Health·Matthew B Baird, Irfan M Asif
Jun 27, 2018·Clinical Journal of Sport Medicine : Official Journal of the Canadian Academy of Sport Medicine·Gregory W KirschenLauren Hale
Aug 15, 2015·International Archives of Occupational and Environmental Health·Alexander WolkowLuana C Main
Oct 30, 2014·The Aging Male : the Official Journal of the International Society for the Study of the Aging Male·Lawrence D HayesFergal M Grace
Feb 13, 2018·European Journal of Sport Science·Ian C DunicanPeter R Eastwood
Apr 17, 2020·Journal of the International Society of Sports Nutrition·Jozo GrgicZeljko Pedisic
Oct 10, 2018·Sports Medicine·Jozo GrgicZeljko Pedisic
Jul 9, 2020·Journal of Strength and Conditioning Research·Georgia A BrownHugh H K Fullagar
Sep 1, 2019·Chest·Ashley A BrauerMichael A Grandner
May 1, 2021·International Journal of Environmental Research and Public Health·Angus R TeeceMatthew W Driller

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