20 km time trial
hypertrophy
CONTRACTION, HYPERTROPHY
Participants experienced a significant increase in peak power with the supplement compared to the placebo, with an average increase in peak power of 11%. There was also a moderate positive correlation for VOMore research is needed to determine if the benefits from BCAA supplementation are allocated to specific muscles, types of movements, and/or exercise modality. This study did not assess changes in lean tissue mass; therefore, it is unclear if the supplement enhanced muscle functionality in the absence of hypertrophy. Future studies could assess this aspect noninvasively by using ultrasonography to image muscle structure and examine change in the muscle to better understand the effects of supplementation on performance measures [BCAAs are also noted to be of importance for their protein-sparing effect in the period after exercise [The addition of citrulline is likely to have also played a role in the observed effects in the present study as oral supplementation of citrulline increases arginine, which is the primary substrate for NO biosynthesis, resulting in increased blood flow, oxygen, and nutrient delivery to muscles [As strenuous exercise can create a significant, short-term decrease in free choline in the blood that would inhibit excitation – contraction coupling at the neuromuscular junction [Previous studies reported increases in average power from BCAA supplementation [Various studies have found BCAA ingestion before exercise contributes to reduced perceived exertion during exercise [