The Laetoli footprints and early hominin locomotor kinematics

David A. Raichlen, Herman Pontzer, Michael D. Sockol

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

A critical question in human evolution is whether the earliest bipeds walked with a bent-hip, bent-knee gait or on more extended hindlimbs. The differences between these gaits are not trivial, because the adoption of either has important implications for the evolution of bipedalism. In this study, we re-examined the Laetoli footprints to determine whether they can provide information on the locomotor posture of early hominins. Previous researchers have suggested that the stride lengths of Laetoli hominins fall within the range of modern human stride lengths and therefore, Laetoli hominins walked with modern-human-like kinematics. Using a dynamic-similarity analysis, we compared Laetoli hominin stride lengths with those of both modern humans and chimpanzees. Our results indicate that Laetoli hominins could have used either a bent-hip, bent-knee gait, similar to a chimpanzee, or an extended-hindlimb gait, similar to a human. In fact, our data suggest that the Laetoli hominins could have walked near their preferred speeds using either limb posture. This result contrasts with most previous studies, which suggest relatively slow walking speeds for these early bipeds. Despite the many attempts to discern limb-joint kinematics from Laetoli stride lengths, our study concludes that stride lengths alone do not resolve the debate over early hominin locomotor postures.

Original languageEnglish (US)
Pages (from-to)112-117
Number of pages6
JournalJournal of human evolution
Volume54
Issue number1
DOIs
StatePublished - Jan 2008

Keywords

  • Australopithecus
  • Biomechanics
  • Bipedalism
  • Chimpanzee
  • Dynamic similarity
  • Froude number
  • Stride length

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Anthropology

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