The effect of isokinetic dynamometer deceleration phase on maximum ankle joint range of motion and plantar flexor mechanical properties tested at different angular velocities

JOURNAL OF BIOMECHANICS

卷:92

Article

Pinto, Matheus Daros¹  Wilson, Cody James¹  Kay, Anthony David²  Cochrane, Jodie¹  Blazevich, Anthony John¹ 

[1] Edith Cowan Univ, Sch Med & Hlth Sci, CESSR, Perth, WA, Australia

[2] Univ Northampton, Sport Exercise & Life Sci, Northampton, England

关键词: Muscle stretching;    Flexibility;    Muscle stiffness;    Velocity-dependent;   

DOI  :  10.1016/j.jbiomech.2019.05.036

来源: Elsevier

【 摘 要 】

During range of motion (max-ROM) tests performed on an isokinetic dynamometer, the mechanical delay between the button press (by the participant to signal their max-ROM) and the stopping of joint rotation resulting from system inertia induces errors in both max-ROM and maximum passive joint moment. The present study aimed to quantify these errors by comparing data when max-ROM was obtained from the joint position data, as usual (max-ROMPOS), to data where max-ROM was defined as the first point of dynamometer arm deceleration (max-ROMACC). Fifteen participants performed isokinetic ankle joint max-ROM tests at 5, 30 and 60 degrees s(-1). Max-ROM, peak passive joint moment, end-range musculoarticular (MAC) stiffness and area under the joint moment-position curve were calculated. Greater max-ROM was observed in max-ROMPOS than max-ROMACC (13 < 0.01) at 5 (0.2 +/- 0.15%), 30 (1.8 +/- 1.0%) and 60 degrees s(-1) (5.9 +/- 2.3%), with the greatest error at the fastest velocity. Peak passive moment was greater and end-range MAC stiffness lower in max-ROMPOS than in max-ROMACC only at 60 degrees s(-1) (P < 0.01), whilst greater elastic energy storage was found at all velocities. Max-ROM and peak passive moment are affected by the delay between button press and eventual stopping of joint rotation in an angular velocity-dependent manner. This affects other variables calculated from the data. When high data accuracy is required, especially at fast joint rotation velocities (>= 30 degrees s(-1)), max-ROM (and associated measures calculated from joint moment data) should be taken at the point of first change in acceleration rather than at the dynamometer's ultimate joint position. (C) 2019 Published by Elsevier Ltd.

【 授权许可】

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