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Unformatted text preview: Q Q www.sciam.com SCIENTIFIC AMERICAN 99 MATT COLLINS Mark A. W. Andrews, professor of physiology and director of the independent study program at the Lake Erie College of Osteo- pathic Medicine, explains: The exact mechanism by which exercise augments strength remains unclear, but its basic principles are understood. Two processes appear to be involved: hypertrophy, or the enlarge- ment of cells, and neural adaptations that enhance nerve-mus- cle interaction. Muscle cells subjected to regular bouts of exercise, followed by periods of rest that include a sufficient intake of dietary pro- tein, undergo hypertrophy. (This should not be confused with short-term swelling resulting from water uptake into cells.) Im- proved muscle protein synthesis and incorporation of these pro- teins into cells cause the mus- cle-building effect. When a muscle cell is activated by its nerve cell, the interaction of the proteins responsible for muscle contraction—actin and myosin—generates force via changes in protein struc- ture called power strokes....
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This note was uploaded on 12/01/2010 for the course BIO SCI Bio Sci E1 taught by Professor Catherineloudin during the Spring '10 term at UC Irvine.
- Spring '10