The use of yank-time signal as an alternative to identify kinematic events and define phases in human countermovement jumping

Sofyan B. Sahrom; Jodie C. Wilkie; Kazunori Nosaka; Anthony J. Blazevich

doi:10.1098/rsos.192093

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The use of yank-time signal as an alternative to identify kinematic events and define phases in human countermovement jumping

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The use of yank-time signal as an alternative to identify kinematic events and define phases in human countermovement jumping

Sofyan B. Sahrom, Jodie C. Wilkie, Kazunori Nosaka and Anthony J. Blazevich

Royal Society Open Science, Vol.7(8)

26/08/2020

DOI: https://doi.org/10.1098/rsos.192093

PMID: 32968500

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Abstract

Bimodal

Force Platform

Physics And Biophysics

Vertical Jump

Yank-Time

Detailed examinations of both the movement and muscle activation patterns used by animals and humans to complete complex tasks are difficult to obtain in many environments. Therefore, the ability to infer movement and muscle activation patterns after capture of a single set of easily obtained data is highly sought after. One possible solution to this problem is to capture force-time data through the use of appropriate transducers, then interrogate the signal's derivative, the yank-time signal, which amplifies, and thus highlights, temporal force-time changes. Because the countermovement vertical jump (CMJ) is a complex movement that has been well studied in humans, it provides an excellent preliminary model to test the validity of this solution. The aim of the present study was therefore to explore the use of yank-time signal, derived from vertical ground reaction force-time data, to identify and describe important kinematic (captured using three-dimensional motion analysis) and kinetic events in the CMJ, and to relate these to possible muscle activation (electromyography) events that underpin them. It was found that the yank-time signal could be used to accurately identify several key events during the CMJ that are likely to be missed or misidentified when only force-time data are inspected, including the first instances of joint flexion and centre of mass movement. Four different jump profiles (i.e. kinematic patterns) were inferred from the yank-time data, which were linked to different patterns of muscle activation. Therefore, yank-time signal interrogation provides a viable method of estimating kinematic patterns and muscle activation strategies in complex human movements.

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Title: The use of yank-time signal as an alternative to identify kinematic events and define phases in human countermovement jumping
Creators: Sofyan B. Sahrom - Edith Cowan University
Jodie C. Wilkie - Edith Cowan University
Kazunori Nosaka - Edith Cowan University
Anthony J. Blazevich - Edith Cowan University
Publication Details: Royal Society Open Science, Vol.7(8)
Publisher: The Royal Society
Grant note: Edith Cowan University Postgraduate Research Schol / Edith Cowan University Postgraduate Research Scholarship (International)
Identifiers: 991013087220002368
Copyright: © 2020 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
Academic Unit: Faculty of Health
Language: English
Resource Type: Journal article

The use of yank-time signal as an alternative to identify kinematic events and define phases in human countermovement jumping

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