骨骼肌肌肽含量與beta-丙胺酸對運動表現影響之初探

High-intensity exercise will cause carboxylic acid to dissociate, raising the hydrogen ion concentration, which is among the factors of peripheral muscle fatigue that may affect the overall athletic performance and training outcome. Carnosine has been shown to play a role in buffering acid-base levels and inhibit a drop in pH value; its physiological function has a positive effect on the performance of high-intensity exercises. Type II muscle fiber contains 1.71 times greater carnosine before beta-alanine supplementation than type I muscle does; and supplementation of beta-alanine is positively correlated to-and dose dependent on the amount of carnosine. The amount supplemented shall be 10 mg．Kg-1, which is equivalent to 800 mg of beta-alanine for a single supplement at the maximum permissible level, and a daily maximum amount of 6.4 g, continues for 10 weeks, then promotes the carnosine concentration to reach 80.1%. Oral administration of beta-alanine had little effect on endurance, maximum strength, and one-repetition maximum high-intensity exercise. The amount of carnosine is positively correlated to maximum power in the last 10 seconds of high-intensity exercise, and can enhance the maximum power in high-intensity exercises over the very last 30 seconds.