Study of Monkey, Ape, and Human Morphology and Physiology Relating to Strength and Endurance. Phase Viii: Factors in the Superiority of Chimpanzee over Human Strength

摘要

Detailed consideration and testing of hypotheses against available data indicate that the marked two-to-one superiority of chimpanzee over human upper extremity strength per unit of body-weight is apparently due to a combination in the chimpanzee of relatively larger upper extremities, higher proportions of contractile material, smaller average body-size, muscle origins and insertions farther from joints, obliquity of muscle fibers, greater capillary density and glycogen storage in muscles, and greater frequency and ease of innervating a higher percentage of motor endplates, but not so different physico-chemical processes of muscular contraction and not, among the subjects tested, significantly to difference in exercise, although somewhat differential response to equivalent exercise is likely. (Author)