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Non-local acute stretching effects on strength performance in healthy young adults

Behm, David G and Alizadeh, Shahab and Drury, Ben and Granacher, Urs and Moran, Jason (2021) 'Non-local acute stretching effects on strength performance in healthy young adults.' European Journal of Applied Physiology. ISSN 1439-6319 (In Press)

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Abstract

Background Static stretching (SS) can impair performance and increase range of motion of a nonexercised or non-stretched muscle respectively. An underdeveloped research area is the effect of unilateral stretching on non-local force output. Objective The objective of this review was to describe the effects of unilateral SS on contralateral, non-stretched, muscle force and identify gaps in the literature. Methods A systematic literature search following Preferred Reporting Items for Systematic Review and Meta-Analyses Protocols guidelines was performed according to prescribed inclusion and exclusion criteria. Weighted means and ranges highlighted the non-local force output response to unilateral stretching. The Physiotherapy Evidence Database scale was used to assess study risk of bias and methodological quality. Results Unilateral stretching protocols from six studies involved 6.3±2 repetitions of 36.3±7.4 seconds with 19.3±5.7 seconds recovery between stretches. The mean stretchinduced force deficits exhibited small magnitude effect sizes for both the stretched (-6.7±7.1%, d=-0.35: 0.01 to -1.8) and contralateral, non-stretched, muscles (-4.0±4.9%, d=-0.22: 0.08 to -1.1). Control measures exhibited trivial deficits. Conclusion The limited literature examining non-local effects of prolonged SS revealed that both the stretched and contralateral, non-stretched, limbs of young adults demonstrate small magnitude force deficits. However, the frequency of studies with these effects were similar with three measures demonstrating deficits, and four measures showing trivial changes. These results highlight the possible global (non-local) effects of prolonged SS. Further research should investigate effects of lower intensity stretching, upper versus lower body stretching, different age groups, incorporate full warm-ups, and identify predominant mechanisms among others.

Item Type: Article
Uncontrolled Keywords: flexibility; power; crossover; fatigue; mental fatigue; neural inhibition
Divisions: Faculty of Science and Health > Sport, Rehabilitation and Exercise Sciences, School of
Depositing User: Elements
Date Deposited: 01 Mar 2021 10:01
Last Modified: 01 Mar 2021 10:01
URI: http://repository.essex.ac.uk/id/eprint/29966

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