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

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Abstract

Background

Static stretching (SS) can impair performance and increase range of motion of a non-exercised 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 s with 19.3 ± 5.7 s recovery between stretches. The mean stretch-induced 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.

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Data availability statement

All pertinent data are provided in the listed tables (PEDro scale analysis, individual and mean study characteristics) and figures (PRISMA flow chart).

Abbreviations

EMG:

Electromyography

MVC:

Maximal voluntary contraction

PEDro:

Physiotherapy evidence database

PIC:

Persistent inward currents

PICOS:

Population, intervention, comparison and outcomes

PRISMA-P:

Preferred reporting items for systematic review and meta-analysis protocols

ROM:

Range of motion

SS:

Static stretching

References

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Funding

Partial funding was provided by the Natural Science and Engineering Research Council of Canada.

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Authors and Affiliations

Authors

Contributions

All authors contributed to the conception, writing and revisions to the manuscript. DGB, SA, conducted the literature search and collected and collated the data. DGB wrote the first draft of the manuscript. JM, BD and UG provided input into the analysis and revised the original manuscript.

Corresponding author

Correspondence to David G. Behm.

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Conflicts of interest

The authors declare no conflicts of interest with the contents of this manuscript.

Additional information

Communicated by Michael Lindinger.

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Behm, D.G., Alizadeh, S., Drury, B. et al. Non-local acute stretching effects on strength performance in healthy young adults. Eur J Appl Physiol 121, 1517–1529 (2021). https://doi.org/10.1007/s00421-021-04657-w

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  • DOI: https://doi.org/10.1007/s00421-021-04657-w

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