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Exerc Sci > Accepted Articles
Review on Exercise Training and Protein Intake in Skeletal Muscle Metabolism
Yun-A Shin1, Il-Young Kim2
1Dankook University, Cheonam-Si, Chungnam , Korea
2Department of Geriatrics, The University of Arkansas for Medical Sciences, Jonesboro, United States
Correspondence  Yun-A Shin , Tel: 0415503830, Fax: 0415503831, Email: shinagel@empas.com
Received: May 14, 2017;  Accepted: June 7, 2017.  Published online: June 7, 2017.
BACKGROUND: Resistance exercise stimulated the synthesis of skeletal muscle protein, which is profound the effects on muscle size, and strength. Regardless of the effects of resistance exercise, an imbalance between the rates of muscle protein synthesis and breakdown results in a negative net muscle protein balance in fasted state. However, protein intake, especially the amino acids, absorbed from dietary intake have a stimulatory effect on muscle synthesis after exercise, which is induced a positive muscle protein balance. PURPOSE:
The purpose of this review was to summarize available data on the effect of exercise intervention and amino acids intake on muscle protein synthesis and provide information for developing effective exercise intervention and amino acids supplements, applicable to training practice.
In this review, I have reviewed currently available data mainly from stable isotope tracer methodology studies on exercise intervention and protein supplement for muscle protein synthesis. SUMMARY/
Taken together, it has reported that resistance exercise alone may not be effective in a positive net muscle protein balance due to protein breakdown exceeds synthesis. However, combined exercise and amino acids, especially essential amino acids, have a stimulatory effect on muscle protein synthesis after exercise. It has been shown that muscle protein synthesis is proportional to until 20g of the protein intake, but it was the difference on exercise intensity, duration, frequency, and individual training status. Taking this into consideration, it is increasingly that the effect of resistance exercise on muscle protein synthesis.
Key words: Exercise; Protein intake; Skeletal muscle metabolism; Stable isotope tracer methodology
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