Do highly trained monkeys walk like humans? A kinematic study of bipedal locomotion in bipedally trained Japanese macaques

Eishi Hirasaki, Naomichi Ogihara, Yuzuru Hamada, Hiroo Kumakura, Masato Nakatsukasa

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

In this study, we examined the kinematics of bipedal walking in macaque monkeys that have been highly trained to stand and walk bipedally, and compared them to the kinematics of bipedal walking in ordinary macaques. The results revealed that the trained macaques walked with longer and less frequent strides than ordinary subjects. In addition, they appear to have used inverted pendulum mechanics during bipedal walking, which resulted in an efficient exchange of potential and kinetic energy. These gait characteristics resulted from the relatively more extended hindlimb joints of the trained macaques. By contrast, the body of the ordinary macaques translated downward during the single-limb stance phase due to more flexed hindlimb joints. This resulted in almost in-phase fluctuations of potential and kinetic energy, which indicated that energy transformation was less efficient in the ordinary macaques. The findings provide two insights into the early stage of the evolution of human bipedalism. First, the finding that training considerably improved bipedal walking a posteriori may explain why the very first bipeds that might not yet have been morphologically adapted to bipedal walking continued to walk bipedally. The evolutionary transition from quadrupedalism to bipedalism might not be as difficult as has been envisioned. In addition, the finding that macaques, which are phylogenetically distant from humans and in which bipedal walking is unlike human walking, could develop humanlike gait characteristics with training, provides strong support for the commonly held but unproven idea that the characteristics of the human gait are advantageous to human bipedalism.

Original languageEnglish
Pages (from-to)739-750
Number of pages12
JournalJournal of Human Evolution
Volume46
Issue number6
DOIs
Publication statusPublished - 2004 Jun
Externally publishedYes

Fingerprint

Macaca fuscata
locomotion
walking
kinematics
Macaca
monkeys
energy
bipedalism
gait
mechanic
fluctuation
potential energy
joints (animal)
kinetic energy
kinetics
energy conversion
limbs (animal)
mechanics
limb

Keywords

  • Bipedalism
  • Energy cost
  • Hindlimb joints
  • Inverted pendulum
  • Macaca fuscata

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

Cite this

Do highly trained monkeys walk like humans? A kinematic study of bipedal locomotion in bipedally trained Japanese macaques. / Hirasaki, Eishi; Ogihara, Naomichi; Hamada, Yuzuru; Kumakura, Hiroo; Nakatsukasa, Masato.

In: Journal of Human Evolution, Vol. 46, No. 6, 06.2004, p. 739-750.

Research output: Contribution to journalArticle

Hirasaki, Eishi ; Ogihara, Naomichi ; Hamada, Yuzuru ; Kumakura, Hiroo ; Nakatsukasa, Masato. / Do highly trained monkeys walk like humans? A kinematic study of bipedal locomotion in bipedally trained Japanese macaques. In: Journal of Human Evolution. 2004 ; Vol. 46, No. 6. pp. 739-750.
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