During exercise, a buildup of metabolic waste limits muscle contraction, with hydrogen ions being the worst. This is primarily true of our fast fibers, which are most sensitive to hydrogen ions and extremely susceptible to fatigue. If hydrogen ions can be buffered, muscle strength can be maintained for a longer time before fatigue sets in. Anyone, including bodybuilders, involved in exercise where lactic acid buildup is a limiting factor, stands to benefit from supplementation with beta-alanine. In the gym, this benefit may translate into more reps at a given weight.
Research also indicates that beta-alanine increases lactate threshold, improves the ability to maintain maximal power output during high-intensity exercise, and decreases neuromuscular fatigue. When carnosine levels are elevated, nerves fire at a faster rate. For example, instead of one’s body operating at 80% the day after exercise, carnosine may help it perform closer to the highest possible levels. Beta-alanine is primarily intended for athletes who are constantly using the same muscles, without the ability to take a break and recover for a few days.