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Mild to moderate damage in knee extensor muscles accumulates after two bouts of maximal eccentric contractions

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European Journal of Applied Physiology Aims and scope Submit manuscript

Abstract

Purpose

This study aimed to determine whether mild to moderate muscle damage accumulates on the knee extensors after two bouts of maximal eccentric contractions performed over two consecutive days.

Methods

Thirty participants performed an initial bout of maximal eccentric contractions of knee extensors during the first day of the protocol (ECC1). Then, they were separated in two groups. The Experimental (EXP) group repeated the eccentric bout 24 h later (ECC2) while the Control (CON) group did not. Indirect markers of muscle damage (i.e., strength loss, muscle soreness, and shear modulus) were measured to quantify the amount of muscle damage and its time course.

Results

Two days after the initial eccentric session, participants from EXP had a higher strength deficit (− 14.5 ± 10.6%) than CON (− 6.6 ± 8.7%) (P = 0.017, d = 0.9). Although both groups exhibited an increase in knee extensors shear modulus after ECC1, we found a significant increase in muscle shear modulus (+ 13.3 ± 22.7%; P < 0.01; d = 0.5) after ECC2 for the EXP group, despite the presence of mild to moderate muscle damage (i.e., strength deficit about 16%).

Conclusion

Although the markers of muscle damage used in the current study were indirect, they suggest that the repetition of two bouts of maximal eccentric contractions with 24 h apart induces additional muscle damage in the knee extensors in presence of mild to moderate muscle damage.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

ANOVA:

Analysis of variance

CON:

Control group

D1, D2, D3, D4, D7 :

Day 1, Day 2, Day 3, Day 4, Day 7

ECC1, ECC2 :

Eccentric training 1, Eccentric training number 2

EXP:

Experimental group

MVC:

Maximal voluntary contraction

RF:

Rectus femoris

VM:

Vastus medialis

VL:

Vastus lateralis

References

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Acknowledgements

The authors thank all the participants for their participation.

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Authors and Affiliations

Authors

Contributions

Author contributions

Lilian Lacourpaille conceived and designed research. Titouan Morin and Inès Boulaouche conducted the experiments and collected the data. Lilian Lacourpaille and Titouan Morin analyzed the data. Antoine Nordez, Marc Jubeau, Robin Souron, Lilian Lacourpaille and Titouan Morin drafted the manuscript. All authors provided critical appraisal to the manuscript and approved the final version.

Corresponding author

Correspondence to Lilian Lacourpaille.

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Conflict of interest

No potential conflict of interest was reported by the authors. The results of the study are presented clearly, honestly, and without fabrication, falsification or inappropriate data manipulation.

Additional information

Communicated by Michalis G Nikolaidis.

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Cite this article

Morin, T., Souron, R., Boulaouche, I. et al. Mild to moderate damage in knee extensor muscles accumulates after two bouts of maximal eccentric contractions. Eur J Appl Physiol 123, 2723–2732 (2023). https://doi.org/10.1007/s00421-023-05257-6

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  • DOI: https://doi.org/10.1007/s00421-023-05257-6

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