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Related Experiment Videos

Dynamically similar locomotion in horses.

Sharon R Bullimore1, Jeremy F Burn

  • 1Department of Anatomy, University of Bristol, Southwell Street, Bristol, BS2 8EJ, UK. sbullimore@kin.ucalgary.ca

The Journal of Experimental Biology
|January 21, 2006
PubMed
Summary

Horses of different sizes trot in a dynamically similar way, meaning their movement patterns remain consistent regardless of body mass. This dynamic similarity in locomotion is maintained by compensatory mechanisms, potentially involving tendon properties.

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Area of Science:

  • Biomechanics
  • Animal Locomotion
  • Scaling Laws

Background:

  • Animals of different sizes can exhibit dynamically similar locomotion if biomechanical parameters scale appropriately.
  • Understanding size-related locomotion differences is crucial in species with significant size variation, like domestic horses.

Purpose of the Study:

  • To investigate the effects of body size on locomotion dynamics in domestic horses.
  • To test the hypothesis that horses maintain dynamically similar locomotion across their size range.

Main Methods:

  • Measured relative stride length (RSL) and duty factor (DF) in 21 trotting horses (86-714 kg).
  • Interpolated RSL and DF data at equivalent speeds using Froude numbers (0.5, 0.75, 1.0).

Main Results:

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  • Relative stride length and duty factor at equal Froude numbers showed no significant relationship with body mass.
  • Findings support the hypothesis of dynamically similar locomotion in horses across a range of body sizes.

Conclusions:

  • Horses appear to maintain dynamically similar locomotion, suggesting size-compensating mechanisms are at play.
  • Nonlinear tendon properties may contribute to this dynamic similarity, but likely do not fully explain the results.
  • A 'compensatory distortion' in locomotion may counteract size effects in horses, a principle applicable to growth-related size changes.