Definition: "An ergogenic aid is any substance or phenomenon that enhances performance "
Heavy training + betaine = more testosterone
A demanding training schedule can lower athletes' testosterone levels, which can compromise muscle recovery. Betaine supplementation may prevent this, according to a study in which young football players were used as test subjects.
The players in both groups had a similar training schedule.
As the suplementation period progressed, testosterone levels in the placebo group [PG] dropped - probably as a result of the training. In the [BG] supplementation group, however, the testosterone level increased. Because testosterone stimulates muscle growth, this may mean that football players recover better in the longer term by supplementing with betaine.
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"More research is necessary to determine if the increases in anabolic hormones are sustainable for longer than 14 weeks of supplementation, and if a longer supplementation period would translate to meaningful physiological adaptations."