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Changes in force and stiffness after static stretching of eccentrically-damaged hamstrings

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Abstract

Purpose

This study compared responses to static stretching between eccentrically damaged and non-damaged muscles.

Methods

Twelve young men performed 60 maximum knee flexor eccentric contractions of one leg, and received a 300-s continuous passive static stretching at tolerable intensity without pain to both knee flexors at 2 and 4 days after the eccentric exercise. Range of motion (ROM) and passive stiffness during knee extension, passive torque at onset of pain (PT), maximum voluntary isometric (MVC-ISO) and isokinetic concentric contraction torque (MVC-CON), and visual analogue scale (VAS) for muscle soreness were measured before, immediately after, 60 min, 2 and 4 days after exercise as well as before, immediately after, 20 and 60 min after the stretching. Changes in these variables after eccentric exercise and stretching were compared between limbs.

Results

The eccentric exercise decreased MVC-ISO, MVC-CON, ROM and PT, and increased passive stiffness and VAS (p < 0.05), suggesting that muscle damage was induced to the knee flexors. ROM and PT increased after stretching for both limbs; however, the magnitude of the increase was greater (p < 0.05) for the damaged than non-damaged limb. Passive stiffness decreased for both limbs similarly (4–7 %) at immediately after stretching (p < 0.05). Significant decreases in MVC-ISO torque (7–11 %) after stretching were observed only for the non-damaged limb (p < 0.05), but MVC-CON torque did not change after stretching for both limbs. VAS decreased for the exercised limb after stretching (p < 0.05).

Conclusions

These results suggest that the static stretching at tolerable intensity without pain produced greater positive effects on damaged than non-damaged muscles.

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Abbreviations

ANOVA:

Analysis of variance

CK:

Creatine kinase

CV:

Coefficient of variation

DOMS:

Delayed onset muscle soreness

EMG:

Electromyogram

ICC:

Intra-class correlation coefficients

MVC-CON torque:

Maximum voluntary concentric contraction torque

MVC-ISO torque:

Maximum voluntary isometric contraction torque

PT:

Passive torque

RFD:

Rate of force development

RMS:

Root mean square

ROM:

Range of motion

SD:

Standard deviation

SPT:

Static passive torque

VAS:

Visual analogue scale

References

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Acknowledgments

This work was supported in part by a grant from A-kit Co., Ltd. and the Public Advertisement Research Project of Nihon Fukushi University.

Conflict of interest

All the authors declare that there is no conflict of interest regarding this article.

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Authors and Affiliations

Authors

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Correspondence to Shigeyuki Suzuki.

Additional information

Communicated by Olivier Seynnes.

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Matsuo, S., Suzuki, S., Iwata, M. et al. Changes in force and stiffness after static stretching of eccentrically-damaged hamstrings. Eur J Appl Physiol 115, 981–991 (2015). https://doi.org/10.1007/s00421-014-3079-3

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  • DOI: https://doi.org/10.1007/s00421-014-3079-3

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