ArticleBiology open2013
A new look at the Dynamic Similarity Hypothesis: the importance of swing phase.
Article in Biology open, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed.
- Overground walking patterns after chronic incomplete spinal cord injury show distinct response patterns to unloading.Journal of neuroengineering and rehabilitation · 2018Trial
- The travel speeds of large animals are limited by their heat-dissipation capacities.PLoS biology · 2023Article
- Development of running is not related to time since onset of independent walking, a longitudinal case study.Frontiers in human neuroscience · 2023Article
- Positional Behavior of Introduced Monk Parakeets (Animals : an open access journal from MDPI · 2022Article
- Natural Frequency Method: estimating the preferred walking speed ofRoyal Society open science · 2021Article
- Human Locomotion in Hypogravity: From Basic Research to Clinical Applications.Frontiers in physiology · 2017Review
- Locomotor preferences in terrestrial vertebrates: An online crowdsourcing approach to data collection.Scientific reports · 2016Article
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Authors and funding
3 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The Dynamic Similarity Hypothesis (DSH) suggests that when animals of different size walk at similar Froude numbers (equal ratios of inertial and gravitational forces) they will use similar size-corrected gaits. This application of similarity theory to animal biomechanics has contributed to fundamental insights in the mechanics and evolution of a diverse set of locomotor systems. However, despite its popularity, many mammals fail to walk with dynamically similar stride lengths, a key element of gait that determines spontaneous speed and energy costs. Here, we show that the applicability of the DSH is dependent on the inertial forces examined. In general, the inertial forces are thought to be the centripetal force of the inverted pendulum model of stance phase, determined by the length of the limb. If instead we model inertial forces as the centripetal force of the limb acting as a suspended pendulum during swing phase (determined by limb center of mass position), the DSH for stride length variation is fully supported. Thus, the DSH shows that inter-specific differences in spatial kinematics are tied to the evolution of limb mass distribution patterns. Selection may act on morphology to produce a given stride length, or alternatively, stride length may be a "spandrel" of selection acting on limb mass distribution.
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Registered trials
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