1. When exercising, protein's catabolism increases, and nitrogen excretion in urine and sweat increases, even negative nitrogen balance appears.
In addition, exercise can accelerate the oxidation and energy supply of branched-chain amino acids including valine, leucine and isoleucine, and reduce the concentration of branched-chain amino acids in tissues and blood. Proper supplementation of protein powder is helpful to prevent the injury caused by protein deficiency.
2. protein's anabolism is enhanced in the recovery period after exercise. If protein is insufficient, it may affect the repair of sports injury, which is not conducive to the demand for muscle gain.
Insufficient supplementation of protein may also lead to sports anemia. When the level of branched-chain amino acids in plasma drops, it may cause exercise-induced central fatigue, which is manifested by the decline of exercise ability.
It's worth noting that the more protein you supplement after fitness, the better. Excessive intake of protein will increase the burden of liver and kidney, and increase acid metabolites, leading to physical fatigue. Specific dietary supplements of protein powder should be taken under the guidance of a sports dietitian.