Quantification of stability in an agility drill using linear and nonlinear measures of variability.

MEHDIZADEH, Sina, ARSHI, Ahmed Reza and DAVIDS, Keith (2014). Quantification of stability in an agility drill using linear and nonlinear measures of variability. Acta of bioengineering and biomechanics / Wrocław University of Technology, 16 (3), 59-67.

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Abstract

This study implemented linear and nonlinear methods of measuring variability to determine differences in stability of two groups of skilled (n = 10) and unskilled (n = 10) participants performing 3m forward/backward shuttle agility drill. We also determined whether stability measures differed between the forward and backward segments of the drill. Finally, we sought to investigate whether local dynamic stability, measured using largest finite-time Lyapunov exponents, changed from distal to proximal lower extremity segments. Three-dimensional coordinates of five lower extremity markers data were recorded. Results revealed that the Lyapunov exponents were lower (P < 0.05) for skilled participants at all joint markers indicative of higher levels of local dynamic stability. Additionally, stability of motion did not differ between forward and backward segments of the drill (P > 0.05), signifying that almost the same control strategy was used in forward and backward directions by all participants, regardless of skill level. Furthermore, local dynamic stability increased from distal to proximal joints (P < 0.05) indicating that stability of proximal segments are prioritized by the neuromuscular control system. Finally, skilled participants displayed greater foot placement standard deviation values (P < 0.05), indicative of adaptation to task constraints. The results of this study provide new methods for sport scientists, coaches to characterize stability in agility drill performance.

Item Type:	Article
Research Institute, Centre or Group - Does NOT include content added after October 2018:	Centre for Sports Engineering Research
Identification Number:	https://doi.org/10.5277/abb140307
Page Range:	59-67
Depositing User:	Carmel House
Date Deposited:	28 Jul 2016 13:52
Last Modified:	18 Mar 2021 18:07
URI:	https://shura.shu.ac.uk/id/eprint/13022

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