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Acute changes in passive stiffness of the individual hamstring muscles induced by resistance exercise: effects of muscle length and exercise duration

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European Journal of Applied Physiology Aims and scope Submit manuscript

Abstract

Purpose

A previous study revealed that resistance exercise with eccentric contraction and a wide range of motion (ROM) can acutely decrease muscle stiffness of a specific muscle. To explore further approaches to decrease the stiffness, we examined the acute changes in passive stiffness of the individual hamstring muscles after eccentric-only resistance exercise with different combinations of muscle lengths and exercise durations.

Methods

Thirteen healthy young male participants performed three sessions of eccentric-only exercises that comprised stiff-leg deadlift with different muscle lengths and exercise durations (duration per repetition × the total number of repetitions) on separate days as follows: (1) short muscle lengths with a short duration (SS); (2) long muscle lengths with a short duration (LS); and (3) long muscle lengths with a long duration (LL). Maximal joint ROM, passive torque, shear modulus of each hamstring muscle, and maximal isometric torque of knee flexion were measured before, and at 3, 30, and 60 min after each session.

Results

The shear modulus of the semimembranosus was significantly lower at 3 min post-exercise (129.8 ± 22.7 kPa) than at pre-exercise (140.5 ± 19.1 kPa, p < 0.01) in LL, but not in SS or LS. No significant differences were observed in the shear moduli of the biceps femoris long head or semitendinosus between pre-exercise and 3 min post-exercise in any session.

Conclusion

The combination of long muscle lengths and a long duration during eccentric-only resistance exercise is important to immediately decrease the stiffness (shear modulus) of a specific muscle.

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Data availability

The data sets used in this study are available from the corresponding author on reasonable request.

Code availability

Information on software application is available upon reasonable request.

Abbreviations

BFlh:

Biceps femoris long head

CV:

Coefficient of variation

EN:

Eccentric-only contractions and a narrow exercise range of motion

ICC:

Intraclass correlation coefficient

LL:

Eccentric contraction at long muscle lengths with a long duration

LS:

Eccentric contraction at long muscle lengths with a short duration

RMS :

Root-mean-square

ROM:

Range of motion

SDL:

Stiff-leg deadlift

SM:

Semimembranosus

SS:

Eccentric contraction at short muscle lengths with a short duration

ST:

Semitendinosus

References

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Acknowledgements

This work was conducted with the support a grant from the Japan Society for the Promotion of Science (no. 21J20128).

Funding

This work was conducted with a grant support from the Japan Society for the Promotion of Science (no. 21J20128).

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Authors and Affiliations

Authors

Contributions

RK, TH, and TW conceived and designed the study. RK conducted the experiments, analyzed the data, wrote the original draft, and reviewed its draft. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Taku Wakahara.

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Conflict of interest

The authors declare no competing interests to declare that are relevant to the content of this article.

Ethics approval

The present study was approved by the Doshisha University Research Ethics Review Committee regarding Human Subject Research (number: 21006). All experimental procedures involving human participants were based on the Declaration of Helsinki and its later amendments or comparable standards.

Consent to participate

Informed consent was obtained from all individual participants included in the study.

Consent to publish

The authors affirmed that research participants provided informed consent for publication of the images in figures and experimental data.

Additional information

Communicated by Olivier Seynnes.

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Kawama, R., Hojo, T. & Wakahara, T. Acute changes in passive stiffness of the individual hamstring muscles induced by resistance exercise: effects of muscle length and exercise duration. Eur J Appl Physiol 123, 655–666 (2023). https://doi.org/10.1007/s00421-022-05092-1

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  • DOI: https://doi.org/10.1007/s00421-022-05092-1

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