Improving exercise performance Exercise causes an increase in serotonin levels, which are believed to cause fatigue. But BCAAs are believed to reduce serotonin levels, and thus cancel out the fatigue and actually enhance exercise performance. There have been many studies that promote this exact ability: In 1998, subjects ingested either BCAA or a placebo before taking an endurance cycle ride in the heat. The BCAA group cycled 153.1 minutes on average, while the placebo group averaged only 137 minutes. A more recent Japanese study looked at the effects of a BCAA mixture on athletes during a one-month training stint and found that indices of blood oxygen-carrying capacity were increased. However, many other studies indicate that BCAAs have no improvement and the amino acids are said to be ineffective for this use.
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