Effects of support diameter and compliance on common marmoset (Callithrix jacchus) gait kinematics.

Title

Effects of support diameter and compliance on common marmoset (Callithrix jacchus) gait kinematics.

Creator

Young Jesse W; Stricklen Bethany M; Chadwell Brad A

Publisher

The Journal of experimental biology

Date

2016
2016-09

Description

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.

Subject

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

Identifier

Rights

Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).

Pages

2659–2672

Volume

219

Citation

Young Jesse W; Stricklen Bethany M; Chadwell Brad A, “Effects of support diameter and compliance on common marmoset (Callithrix jacchus) gait kinematics.,” NEOMED Bibliography Database, accessed October 18, 2021, https://neomed.omeka.net/items/show/4909.

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