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Home / Equine Research Bank / Proc Biol Sci / Timing of head movements is consistent with energy minimizat...
Proceedings. Biological sciences2016; 283(1843); 20161908; doi: 10.1098/rspb.2016.1908

Timing of head movements is consistent with energy minimization in walking ungulates.

Abstract: Many ungulates show a conspicuous nodding motion of the head when walking. Until now, the functional significance of this behaviour remained unclear. Combining in vivo kinematics of quadrupedal mammals with a computer model, we show that the timing of vertical displacements of the head and neck is consistent with minimizing energy expenditure for carrying these body parts in an inverted pendulum walking gait. Varying the timing of head movements in the model resulted in increased metabolic cost estimate for carrying the head and neck of up to 63%. Oscillations of the head-neck unit result in weight force oscillations transmitted to the forelimbs. Advantageous timing increases the load in single support phases, in which redirecting the trajectory of the centre of mass (COM) is thought to be energetically inexpensive. During double support, in which-according to collision mechanics-directional changes of the impulse of the COM are expensive, the observed timing decreases the load. Because the head and neck comprise approximately 10% of body mass, the effect shown here should also affect the animals' overall energy expenditure. This mechanism, working analogously in high-tech backpacks for energy-saving load carriage, is widespread in ungulates, and provides insight into how animals economize locomotion.
© 2016 The Author(s).
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Publication Date: 2016-12-03 PubMed ID: 27903873PubMed Central: PMC5136594DOI: 10.1098/rspb.2016.1908Google Scholar: Lookup
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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.

The research article focuses on the rhythmic head movement in ungulates (hoofed mammals) during walking. The study reveals that this head bobbing serves to minimize their energy expenditure, much like the mechanics seen in high-tech energy-saving backpacks.

Objective and Methods

  • The overarching objective of this research was to understand the functional significance of nodding motions, a common phenomenon observed in ungulates when they walk. To address this, the researchers combined in vivo kinematics data from quadrupedal mammals with a computer-generated model.
  • The focus was mainly on the timing of vertical displacements of the head and neck in accordance with the energy minimization theory in an inverted pendulum walking gait.

Findings

  • The researchers discovered that altering the timing of head movements resulted in increased estimated metabolic cost for carrying the head and neck, which could go up to 63%. This indicates that the head-necks’ systematic oscillations work to optimize energy use.
  • These oscillations also result in weight force fluctuations that are transmitted to the forelimbs. When the load on single support phases increases due to the favorable timing, it redirects the trajectory of the centre of mass (COM), which according to the study is energetically efficient.
  • Conversely, during double support phases, which are considered more energetically expensive due to directional changes of the COM impulse according to collision mechanics, the observed timing decreases the load.

Conclusions and Implications

  • The team concluded that since the head and neck constitute nearly 10% of the body mass, the mechanism they pinpointed has a significant impact on the animals’ overall energy expenditure.
  • This study sheds light on how animals economize locomotion, which can be instrumental in the fields of animal physiology and biomechanics.
  • Moreover, the insight into this natural mechanism, which works similar to high-tech backpacks designed for energy-saving load carriage, could potentially be leveraged in designing more efficient load-bearing equipment in the future.

Cite This Article

APA
Loscher DM, Meyer F, Kracht K, Nyakatura JA. (2016). Timing of head movements is consistent with energy minimization in walking ungulates. Proc Biol Sci, 283(1843), 20161908. https://doi.org/10.1098/rspb.2016.1908

Publication

Proceedings. Biological sciences
ISSN: 1471-2954
NlmUniqueID: 101245157
Country: England
Language: English
Volume: 283
Issue: 1843
PII: 20161908

Researcher Affiliations

Loscher, David M
  • AG Humanbiologie, Department of Biology, Freie Universität Berlin, Albrecht-Thaer-Weg 6, 14195 Berlin, Germany.
Meyer, Fiete
  • FG Mechatronische Maschinendynamik, Department of Mechanics, Einsteinufer 5, Technische Universität Berlin, 10587 Berlin, Germany.
Kracht, Kerstin
  • PAConsult GmbH, Environmental and Structural Dynamics Test Lab, Birkenau 3, 22087 Hamburg, Germany.
Nyakatura, John A
  • AG Morphologie und Formengeschichte, Image Knowledge Gestaltung: an interdisciplinary laboratory, Institute of Biology, Humboldt University, Philippstraße 13, 10115 Berlin, Germany john.nyakatura@hu-berlin.de.

MeSH Terms

  • Animals
  • Biomechanical Phenomena
  • Energy Metabolism
  • Gait
  • Head Movements
  • Horses / physiology
  • Walking

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Citations

This article has been cited 10 times.
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