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Nature2002; 414(6866); 895-899; doi: 10.1038/414895a

Horses damp the spring in their step.

Abstract: The muscular work of galloping in horses is halved by storing and returning elastic strain energy in spring-like muscle-tendon units.These make the legs act like a child's pogo stick that is tuned to stretch and recoil at 2.5 strides per second. This mechanism is optimized by unique musculoskeletal adaptations: the digital flexor muscles have extremely short fibres and significant passive properties, whereas the tendons are very long and span several joints. Length change occurs by a stretching of the spring-like digital flexor tendons rather than through energetically expensive length changes in the muscle. Despite being apparently redundant for such a mechanism, the muscle fibres in the digital flexors are well developed. Here we show that the mechanical arrangement of the elastic leg permits it to vibrate at a higher frequency of 30-40 Hz that could cause fatigue damage to tendon and bone. Furthermore, we show that the digital flexor muscles have minimal ability to contribute to or regulate significantly the 2.5-Hz cycle of movement, but are ideally arranged to damp these high-frequency oscillations in the limb.
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Publication Date: 2002-01-10 PubMed ID: 11780059DOI: 10.1038/414895aGoogle Scholar: Lookup
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  • Journal Article

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

This research study explores how horses efficiently use their energy when galloping, revealing a mechanism akin to a child’s pogo stick, allowing the storage and return of elastic energy through their leg muscles.

Research Objective

The main objective of this research was to understand how horses minimize the work of galloping and how their musculoskeletal adaptations contribute to this. Specifically, the study aimed to unveil the possible reasons for the unique arrangement of muscular and tendon structures in a horse’s leg.

Horse’s Galloping Mechanism

  • The researchers found that the muscles and tendons in a horse’s leg behave like a spring, similar to how a child’s pogo stick works, which is tuned to stretch and recoil at 2.5 strides per second.
  • Unique musculoskeletal adaptations have been observed where digital flexor muscles have extremely short fibers and substantial passive properties, whereas the tendons are very long and span multiple joints. This arrangement allows for the stretching of the spring-like digital flexor tendons, hence reducing the energetically costly length changes in the muscle.
  • Despite seeming redundant for this mechanism, the muscle fibers in the digital flexors are well developed.

Vibration and Fatigue Damage

  • The study reveals that apparently the mechanical structure of the horse’s tendon-peppered leg allows it to vibrate at a high frequency of about 30-40 Hz. Such high-frequency vibration could cause fatigue damage to both the tendons and bone if not regulated.
  • The evidence suggests that, in spite of their minimal contribution to the regular 2.5 Hz movement cycle, the digital flexor muscles are precisely arranged to dampen these high-frequency vibrations, acting as shock absorbers, so to speak, preventing potential fatigue damage.

Conclusion

In conclusion, the research provides an insightful understanding of the efficient energy usage in horses during galloping. It demonstrates the critical role of the muscle-tendon units in energy storage and return, and highlights the protective effect of the digital flexor muscles against high-frequency vibrations. This study could guide further research on animal locomotion mechanisms and their potential biomechanical adaptations.

Cite This Article

APA
Wilson AM, McGuigan MP, Su A, van Den Bogert AJ. (2002). Horses damp the spring in their step. Nature, 414(6866), 895-899. https://doi.org/10.1038/414895a

Publication

Nature
ISSN: 0028-0836
NlmUniqueID: 0410462
Country: England
Language: English
Volume: 414
Issue: 6866
Pages: 895-899

Researcher Affiliations

Wilson, A M
  • Department of Veterinary Basic Sciences, The Royal Veterinary College, Hatfield, Herts AL9 7TA, UK. awilson@rvc.ac.uk
McGuigan, M P
    Su, A
      van Den Bogert, A J

        MeSH Terms

        • Animals
        • Biomechanical Phenomena
        • Elasticity
        • Forelimb
        • Gait
        • Horses / anatomy & histology
        • Horses / physiology
        • Leg Bones / physiology
        • Locomotion
        • Models, Biological
        • Muscle Fibers, Skeletal / physiology
        • Muscle, Skeletal / anatomy & histology
        • Muscle, Skeletal / physiology
        • Tendons / anatomy & histology
        • Tendons / physiology
        • Vibration

        Citations

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