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Contractile properties are less affected at long than short muscle length after eccentric exercise

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European Journal of Applied Physiology Aims and scope Submit manuscript

Abstract

Purpose

The aim of the present study was to investigate whether the electrically evoked muscle responses are differently affected over time by the knee joint angle after an exercise-induced muscle damage (EIMD). We hypothesized that low-frequency-evoked responses would be less affected at long than short muscle length, and that mechanisms located within the muscle and tendinous tissues would be involved.

Methods

Fifteen males performed 45 min loaded downhill walking (DW) exercise. Maximal voluntary contraction torque (MVC), optimal angle for torque production, voluntary activation level (VAL), twitch, doublet at 10 and 100 Hz (Db10 and Db100, respectively), rate of torque development (RTD), post-activation potentiation (PAP), muscle shear elastic modulus (µ) and aponeurosis stiffness were assessed before, after, and 4, 24, 48, 72 and 168 h after the exercise at a knee angle of 40°, 90° and 120° (0°: full extension).

Results

MVC, VAL and Db100 were similarly decreased across joint angles after the DW and optimal angle was not affected. Twitch, Db10, Db10/Db100, PAP and RTD were less affected and muscle µ more increased at long than short muscle lengths (p < 0.05), especially during the first 24 h after the DW exercise.

Conclusion

Low-frequency-evoked responses were more preserved at long than short muscle length the first 24 h after the DW exercise, suggesting that joint angle should be taken into account to assess muscular alterations after EIMD. This length-dependence could be associated to the higher sensitivity to Ca2+ and the higher increase in muscle stiffness at long than short muscle length.

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Data availability

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

Abbreviations

Ca2+ :

Calcium

Db10:

Doublet at 10 Hz

Db100:

Doublet at 100 Hz

Db10/db100:

Low-frequency fatigue

DW:

Downhill walking

E–C coupling:

Excitation–contraction coupling

EIMD:

Exercise-induced muscle damage

KE:

Knee extensors

MVC:

Maximal voluntary contraction

NM:

Neuromuscular

PAP:

Post-activation potentiation

RF:

Rectus femoris

ROI:

Region of interest

RTD:

Rate of torque development

TTL:

Transistor-transistor logic

Twitch:

Mechanical response to a single stimulation

Tw:

Non-potentiated twitch

Twp :

Potentiated twitch

µ:

Shear elastic modulus

VAL:

Voluntary activation level

VL:

Vastus lateralis

References

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Acknowledgements

We would like to thank Benoît Lepetit, Stéphane Baugé, Phillippe Colin, Caroline Dussault, Stéphanie Bourdon, Marvin Subryan, Roxane Dubois, Alexandra Malgoyre, Pierre-Emmanuel Tardo-Dino, Walid Bouaziz, Olivier Nespoulous and the IRBA Biological Analyses Unit for their technical and medical support.

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Authors and Affiliations

Authors

Contributions

EC, JS, SGV and VM designed the study and drafted the manuscript. EC, JS, KC and SGV collected the data. EC, SGV, J-LG and VM participated to the data analysis. KC designed the figures. All the authors contributed to the interpretation of the data and the edition of the manuscript.

Corresponding author

Correspondence to Emeric Chalchat.

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Conflict of interest

The authors report no conflict of interest. This work is known and agreed by the co-authors identified on the manuscript’s title page.

Additional information

Communicated by Nicolas Place.

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Chalchat, E., Siracusa, J., Bourrilhon, C. et al. Contractile properties are less affected at long than short muscle length after eccentric exercise. Eur J Appl Physiol 123, 1101–1114 (2023). https://doi.org/10.1007/s00421-023-05134-2

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  • DOI: https://doi.org/10.1007/s00421-023-05134-2

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