Is coffee an effective pre-workout drink? – The effects of ingesting naturalistic doses of caffeine on one-repetition maximum muscular strength and muscular endurance in females.
Year: 2015
Type: dissertation
Abstract: Extensive research has been conducted on the ergogenic effects of caffeine for endurance \nperformance yet far fewer studies have investigated the effects for intense, short-term \nexercise. Particularly lacking in documented literature is the effects of acute caffeine \ningestion in female athletes. This study aimed to investigate the ergogenic potential of \ncaffeine on upper body and lower body muscular strength and endurance in females. \nFourteen female participants (age 21.1 ± 0.7 years, body mass 65.9 ± 9.5 kg, stature \n165.4 ± 7.4 cm) with one year’s resistance training experience ingested caffeine (61 mg) \nor placebo 1 hour (hr) prior to testing, in a single-blind crossover design. The participants \ncompleted their 3 repetition maximum (3RM) before performing repetitions to failure set at \n60% of their estimated 1RM, for barbell bench press and leg press. A series of paired ttests \nwere performed between the control, caffeine and placebo trials to determine a \ndifference in performance, where 95% significance (P ≤ 0.05) was applied. There was no \neffect (standard error of difference = 0) of caffeine on muscular strength, as 1RM bench \npress (42.39 ± 7.25 kg) and 1RM leg press (112.26 ± 38.73 kg) were the same for all three \ntrials. Compared to placebo, there was a significant increase in repetitions to failure for \nbench press (20 ± 3 reps vs. 22 ± 3 reps, P = 0.001) and leg press (23 ± 8 reps vs. 25 ± 8 \nreps, P = 0.000). The mechanisms supporting the increased number of repetitions with \ncaffeine need to be explored in more detail. Caffeine habituated participants were more \nresponsive to the effects of caffeine than non-users during the caffeine and placebo trials \n(bench press: P = 0.006 vs. P = 0.052 and leg press: P = 0.003 vs. P = 0.018). However, a \nfew factors were identified that may have affected these results. Consequently, future \nstudies should investigate individual participant responsiveness to establish whether they \nare responders to caffeine or not.
Author: Gabrielle Thomas
Language: English
Topic: Coffee research and impacts
Subfield: Pharmacology (medical)
Field: Medicine
Domain: Health Sciences
Open Access status: green
OpenAlex ID: W2560593951