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URL Address
<a href="http://doi.org/10.1242/jeb.140939" target="_blank" rel="noreferrer noopener">http://doi.org/10.1242/jeb.140939</a>
Pages
2659–2672
Volume
219
Dublin Core
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Title
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Effects of support diameter and compliance on common marmoset (Callithrix jacchus) gait kinematics.
Publisher
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The Journal of experimental biology
Date
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2016
2016-09
Subject
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Male; Animals; Callithrix/*physiology; Gait/*physiology; *Balance; *Branch stiffness; *Fine branch niche; *Locomotion; *Stability; Biomechanical Phenomena; Compliance; Forelimb/physiology; Hindlimb/physiology; Video Recording; Computer-Assisted; Image Processing
Creator
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Young Jesse W; Stricklen Bethany M; Chadwell Brad A
Description
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Locomotion is precarious in an arboreal habitat, where supports can vary in both diameter and level of compliance. Several previous studies have evaluated the influence of substrate diameter on the locomotor performance of arboreal quadrupeds. The influence of substrate compliance, however, has been mostly unexamined. Here, we used a multifactorial experimental design to investigate how perturbations in both diameter and compliance affect the gait kinematics of marmosets (Callithrix jacchus; N=2) moving over simulated arboreal substrates. We used 3D-calibrated video to quantify marmoset locomotion over a horizontal trackway consisting of variably sized poles (5, 2.5 and 1.25 cm in diameter), analyzing a total of 120 strides. The central portion of the trackway was either immobile or mounted on compliant foam blocks, depending on condition. We found that narrowing diameter and increasing compliance were both associated with relatively longer substrate contact durations, though adjustments to diameter were often inconsistent relative to compliance-related adjustments. Marmosets also responded to narrowing diameter by reducing speed, flattening center of mass (CoM) movements and dampening support displacement on the compliant substrate. For the subset of strides on the compliant support, we found that speed, contact duration and CoM amplitude explained \textgreater60% of the variation in substrate displacement over a stride, suggesting a direct performance advantage to these kinematic adjustments. Overall, our results show that compliant substrates can exert a significant influence on gait kinematics. Substrate compliance, and not just support diameter, should be considered a critical environmental variable when evaluating locomotor performance in arboreal quadrupeds.
Identifier
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<a href="http://doi.org/10.1242/jeb.140939" target="_blank" rel="noreferrer noopener">10.1242/jeb.140939</a>
Rights
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*Balance
*Branch stiffness
*Fine branch niche
*locomotion
*Stability
2016
Animals
Biomechanical Phenomena
Callithrix/*physiology
Chadwell Brad A
Compliance
Computer-Assisted
Department of Anatomy & Neurobiology
Forelimb/physiology
Gait/*physiology
Hindlimb/physiology
Image Processing
Male
NEOMED College of Medicine
Stricklen Bethany M
The Journal of experimental biology
Video Recording
Young Jesse W