Participants
POLAND, CHRONIC DISEASES
Fifty-five participants were initially enrolled to participate in this study. A total of 43 completed the entire study protocol and were included in analyses. The participants recreationally and regularly trained in CF at different gyms in Poznan, Poland. The criteria for qualifying for the study included good health, age between 18 and 45, male gender, at least one year of CF training experience, and a minimum of two CF sessions a week. The exclusion criteria were current injury or a serious injury in the six months before the study, the use of illegal performance enhancing drugs, vitamin B, choline, or BET supplementation during three weeks preceding the study, metabolic or other chronic diseases. The sample size calculation was performed using G*Power 3.1.9.7. It was estimated that a total of 26 participants were necessary to achieve an anticipated effect size = 0.30 and power (1−ß) = 0.95 at α = 0.05 with correlation among measurements = 0.5 in FGB.