【英语时差8，16】怎么长肌肉？
时间：2015-10-22 06:05:17
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（单词翻译）
You probably know that the way to stronger muscles is a weight or resistance training program, but do you know how weight lifting increases strength? One way is by making muscles larger in circumference1 and hence heavier in mass. Muscles are composed of cells called muscle fibers2. Strength training increases the size of these muscle fibers. This form of muscle growth is called hypertrophy.
Ultimately, muscle fibers hypertrophy by increasing their protein content. Strength training, believe it or not, increases the protein content of your muscles by damaging them. The stress of lifting a challenging weight creates tiny tears in the
structural3 proteins inside the muscle. These tears
activate4 cells on the outer surface of the muscle called satellite cells. Satellite cells multiply and send cells to help repair the damaged areas. These cells donate their
nuclei5 to the damaged fibers,
helping6 them to repair by increasing the size and number of proteins. In addition, through a complex sequence of events, your immune system also aids repair by boosting the protein content of these damaged muscle fibers.
A diet adequate in protein is important too in growing and maintaining strong muscles. Consume too little protein (less than one gram per kilogram of body weight), and your body will
counteract7 your strength training efforts by robbing protein from your muscles. However, consuming more than 1.5 grams per kilogram of body weight isn't beneficial either.
Finally, strength isn't just about beefy muscles. Learning proper technique and how to activate more muscle fibers at once increases strength. This is why newcomers to strength training will often gain strength rapidly at first. They're learning more efficient patterns of movement.
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