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Is step width decoupled from pelvic motion in human evolution?

Michelle Kikel1, Rachel Gecelter1, Nathan E Thompson2

  • 1New York Institute of Technology, College of Osteopathic Medicine, Old Westbury, NY, 11568, USA.

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|May 10, 2020
PubMed
Summary
This summary is machine-generated.

Human bipedalism features narrow steps and pelvic drop. Research shows altering these gait aspects to mimic chimpanzees impacts hip adduction but doesn't fully replicate chimpanzee gait, suggesting decoupled evolutionary paths.

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Area of Science:

  • Human evolution
  • Primate locomotion
  • Biomechanics

Background:

  • Humans exhibit unique bipedal gait characteristics, including adducted hips, valgus knees, and swing-side pelvic drop.
  • These frontal-plane features are hypothesized to aid in balance and energy efficiency during walking.
  • Understanding the evolutionary origins requires analyzing the interrelationships between these gait components.

Purpose of the Study:

  • To investigate the relationship between step width, hip adduction, and pelvic list during human bipedalism.
  • To explore how altering these parameters affects gait patterns, comparing them to chimpanzee and exaggerated human gaits.

Main Methods:

  • Experimental manipulation of step width and pelvic motion in human participants.
  • Gait analysis comparing altered human gaits to chimpanzee and exaggerated human locomotion patterns.

Main Results:

  • Modifying step width or pelvic list to resemble chimpanzee gait influenced hip adduction.
  • However, these alterations did not result in a fully chimpanzee-like gait, indicating limited interdependence.
  • The human pattern of pelvic list appears evolutionarily distinct from narrow steps and valgus knees.

Conclusions:

  • The evolution of valgus knees and narrow steps in humans may be independent of the evolution of human-like pelvic list.
  • Narrow steps in hominins might be linked to reduced locomotion energy costs.
  • The evolutionary origin of the human-like pelvic list pattern remains an open question.