| Articles : Effect of Protein Nutrition Timing on Muscle Protein Synthesis |
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| Abstract |
M
aintaining the appropriate amount of skeletal muscle is important for high-level physical performance, and for both the treatment and prevention of some health issues. These health issues include lifestyle-related diseases as well as sarcopenia and osteopenis. or aging-related loss of skeletal muscle mass and bone mass, respectively. Since protein is one of the major components of skeletal muscle, it is generally acknowledged that the dietary requirement of protein is greater in individuals who engage in regular exercise than in sedentary individuals. Protein intake at 1.2-1.4 g/kg BW/day for endurance exorcist and 1.7-1.8 g/kg BW/day for strength exercise is recommended in Japan, and these values are 20-80% higher than the current recommended dietary allowances in this country. Carbohydrates have been shown to influence muscle protein metabolism; consuming carbohydrates together with protein would facilitate skeletal muscle protein synthesis due to insulin stimulated by ingested carbohydrates. In addition, recent studies suggest the ingestion timing of these nutrients could influence muscle protein metabolism. Some studies conducted with both animals and humans show the possibility that ingesting protein and carbohydrate shortly after completing exercise is more effective in promoting skeletal muscle protein synthesis than ingesting the nutrients several hours after exercise. Increased insulin sensitivity in skeletal muscle after exercise is assumed to be involved in this mechanism. Thus. it appears that ingestion timing as well as what to eat and how much to eat should be considered to establish a nutrition exercise regimen in order to obtain a appropriate skeletal muscle mass. |
| Key Words:
ingestion timing, protein, muscle, sarcopenia, osteopenia |
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