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Development of chimpanzee locomotion on level surfaces

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Human Evolution

Abstract

The objective of this study was to investigate kinesiologically the development of the unique characteristics of the level locomotion of the chimpanzee. The data were obtained semi-longitudinally from six chimpanzees eleven weeks through nineteen years of age. The posture, footfall order, phase duration, speed and foot force (including the hand force) in level locomotion were observed by means of foot contact switches, a 16 mm cine-camera or a video tape recorder and a force plate. The speed or the pattern of locomotion was not particularly controlled. The infants moved freely without any attachments on the body. The age change in locomotion is described. The particular characteristics of the infant chimpanzees compared with those of the adults were: 1) long stance phase duration, 2) wide variety in the difference in the cycle duration between forward movement of the limbs one after another, 3) wide variety in phase duration, speed and foot force, and 4) the forelimbs of the infant just started to stand quadrupedally to carry the larger part of the body weight than the hindlimbs. The dominance of the hindlimbs in locomotor and weight-bearing characteristics becomes clearly fixed at about one year of age. The wide variety of the locomotion pattern will be one of the characteristics of the chimpanzees of all age groups. The human acquisition of bipedal walking is discussed in connection with chimpanzee locomotion.

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Kimura, T. Development of chimpanzee locomotion on level surfaces. Hum. Evol. 2, 107–119 (1987). https://doi.org/10.1007/BF02436400

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  • DOI: https://doi.org/10.1007/BF02436400

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