Caffeine’s ergogenic effects persist during various exercise modalities; however, information establishing its efficacy during CrossFit®
protocols is limited. This study aimed to determine the effects of caffeine supplementation on CrossFit®
performance. Twenty CrossFit®
-trained men (age = 26.7 ± 6.2 years, experience = 3.7 ± 2.9 years) were randomized in a double-blind, crossover design. Participants completed two sessions separated by a seven-day washout period, 60 min after consuming 5 mg/kg body mass of caffeine or a placebo. In each session, participants completed as many rounds as possible in 20 min of five pull-ups, 10 push-ups, and 15 air squats. CrossFit®
performance was the total number of repetitions completed in 20 min. Paired-samples t-tests were used to compare CrossFit®
performance between caffeine and placebo conditions and to test for a potential learning effect between the first and second sessions. CrossFit®
performance was not significantly different during the caffeine condition compared to the placebo (468.6 ± 114.7 vs. 466.7 ± 94.3 repetitions, p
= 0.861). A significant learning effect was identified between the first and second sessions (452.4 ± 101 vs. 483.8 ± 106.5 repetitions, p
= 0.001), with no significant effect of treatment order (p
= 0.438). Caffeine’s ergogenic effect were not present during the CrossFit®
workout “Cindy”; however, future research should include familiarization sessions and examine other CrossFit®
workouts in novice and women participants.
This is an open access article distributed under the Creative Commons Attribution License
which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.