If you're looking for a boost in short-to-medium duration high-intensity muscle performance, few supplements to date have fit the bill as consistently as beta-alanine.
Specifically, beta-alanine seems most effective for supporting exercise lasting longer than 60 seconds. It has not been shown to be significantly or consistently effective in shorter duration bouts of exercise, where the ATP-phosphocreatine energy system is in highest demand.
For example, in one of the first published studies on beta-alanine and human athletic performance, subjects received either a placebo, 20 g per day of creatine monohydrate, 800 mg of beta-alanine four times per day, or the same dose of beta-alanine plus 20 g of creatine monohydrate. Maximal power output in a four-minute all-out cycling test was significantly increased in the two groups receiving beta-alanine, versus those receiving the placebo or only creatine. The most significant improvement was noted in the first and fourth minutes of cycling.
Four weeks of six grams per day of bata-alanine increased the punch force of amateur boxers by an amazing 20 times.
"FOUR WEEKS OF SIX GRAMS PER DAY OF BATA-ALANINE INCREASED THE PUNCH FORCE OF AMATEUR BOXERS BY AN AMAZING 20 TIMES."
Since that early trial, beta-alanine has been consistently suggested to increase muscle power output, strength, training volume, high-intensity exercise performance and peak oxygen uptake (aerobic capacity). Most recently, when players consumed 3.2 g per day of beta-alanine for 12 weeks during a competitive soccer season, their performance was shown to improve by 34.3 percent, compared to a -7.6 percent change in those consuming a placebo. In fact, when all subject responses were analyzed, those consuming beta-alanine improved by a range of 0 to 72.7 percent, whereas those consuming the placebo had a response range of between -37.5 and +14.7 percent.
Similarly, researchers out of the U.K. presented evidence that just four weeks of six grams per day of beta-alanine (1.5 g, four times per day) increased the punch force of amateur boxers by an amazing 20 times, and punch frequency by four times, as compared to a placebo. However, when long rest periods (2-5 minutes) were provided between sets of a high-intensity strength training session, the effects of beta-alanine were insignificant.
Therefore, for the effects of beta-alanine to be most noticeable, I would recommend a high-intensity bodybuilding-style training program, HIIT or interval training, CrossFit, or all-out 1-5 minute bouts to exhaustion, with short rest periods of less than 2 minutes.
WHAT'S THE BOTTOM LINE?
As probably the most consistently effective performance-enhancing supplement to hit the sports nutrition market since creatine, beta-alanine is an ingredient I strongly recommend athletes to keep in their arsenal.