Mechanical energy oscillations of two brachiation gaits: measurement and simulation.

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  • Author(s): Bertram JE;Bertram JE; Chang YH
  • Source:
    American journal of physical anthropology [Am J Phys Anthropol] 2001 Aug; Vol. 115 (4), pp. 319-26.
  • Publication Type:
    Journal Article; Research Support, U.S. Gov't, Non-P.H.S.
  • Language:
    English
  • Additional Information
    • Source:
      Publisher: Wiley-Blackwell Country of Publication: United States NLM ID: 0400654 Publication Model: Print Cited Medium: Print ISSN: 0002-9483 (Print) Linking ISSN: 00029483 NLM ISO Abbreviation: Am J Phys Anthropol Subsets: MEDLINE
    • Publication Information:
      Publication: Hoboken, NJ : Wiley-Blackwell
      Original Publication: Hoboken, NJ : Wiley
    • Subject Terms:
      Energy Metabolism* ; Hylobates*; Locomotion/*physiology; Animals ; Arm/physiology ; Biomechanical Phenomena ; Female ; Kinetics
    • Abstract:
      How do arm-swinging apes locomote effectively over a variety of speeds? One way to reduce the metabolic energy cost of locomotion is to transfer energy between reversible mechanical modes. In terrestrial animals, at least two transfer mechanisms have been identified: 1) a pendulum-like mechanism for walking, with exchange between gravitational potential energy and translational kinetic energy, and 2) a spring-like mechanism for running, where the elastic strain energy of stretched muscle and tendon is largely returned to reaccelerate the animal. At slower speeds, a brachiator will always have at least one limb in contact with the support, similar to the overlap of foot contact in bipedal walking. At faster speeds, brachiators exhibit an aerial phase, similar to that seen in bipedal running. Are there two distinct brachiation gaits even though the animal appears to simply swing beneath its overhead support? If so, are different exchange mechanisms employed? Our kinetic analysis of brachiation in a white-handed gibbon (Hylobates lar) indicates that brachiation is indeed comprised of two mechanically distinct gaits. At slower speeds in "continuous contact" brachiation, the gibbon utilizes a simple pendulum-like transfer of mechanical energy within each stride. At faster speeds in "ricochetal" brachiation, translational and rotational kinetic energy are exchanged in a novel "whip-like" transfer. We propose that brachiators utilize the transfer between translational and rotational kinetic energy to control the dynamics of their swing. This maneuver may allow muscle action at the shoulder to control the transfer and adjust the ballistic portion of the step to meet the requirements for the next hand contact.
      (Copyright 2001 Wiley-Liss, Inc.)
    • Publication Date:
      Date Created: 20010727 Date Completed: 20010823 Latest Revision: 20131121
    • Publication Date:
      20240829
    • Accession Number:
      10.1002/ajpa.1088
    • Accession Number:
      11471130