Muscle Fiber Types

Muscle fiber can be typed according to histologic, biochemical, neurophysiologic, and ultrastructural differences. The relationship between muscle fiber typing and clinical areas of investigation is summarized. Genetic factors are largely responsible for the distribution of main muscle fiber types. Strength training produces relatively slight alterations in muscle properties, as defined by present analytic techniques. The functional adaptation of skeletal muscle are dependent on a multitude of factors, which at the present time are not completely understood.