This began promptly under extensive stretch, much later under mild stretch. The amount of hypertrophy and hyperplasia is proportional to the degree of stretch.Įxcluding an increase caused by fibers splitting, fiber counts of complete cross sections of anterior latissimus dorsi muscles taken at intervals after the onset of stretch showed a steady increase in the total number of fibers. ATPase differentiation of fibers weakens when hypertrophy exceeds 35–40%, producing muscle fibers exhibiting, in general, a homochromatic, light ATPase response. These changes include enlargement of nuclei, nuclear proliferation, and invasion with subsequent splitting of the units producing fibers of varying diameters. The rate of certain histological changes which accompany hypertrophy keeps pace with the rate of the hypertrophy. The teres minor muscle, which was stretched at the same time, also hypertrophied the posterior latissimus dorsi muscle, consisting of red and white fibers, did not change significantly in weight, but its position in the body is such that it was not stretched adequately. In the anterior latissimus dorsi muscle of the chicken hypertrophy was obtained by stretching, whether the muscle was innervated or not.
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