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Changes in central and peripheral neuromuscular fatigue indices after concentric versus eccentric contractions of the knee extensors

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Abstract

Purpose

To better understand neuromuscular characteristics of eccentric exercise-induced muscle damage, this study compared between concentric (CONC) and eccentric (ECC) exercises of knee extensor muscles, and the first (ECC1) and second bouts of the eccentric exercise (ECC2) for central and peripheral parameters associated with neuromuscular fatigue.

Methods

Twelve young men performed three exercise bouts separated by at least 1 week between CONC and ECC1, and 2 weeks between ECC1 and ECC2. In each exercise, maximal voluntary concentric or eccentric contractions of the knee extensors were performed until a reduction in maximal voluntary isometric contraction (MVC) torque of at least 40% MVC was achieved immediately post-exercise. MVC torque, central (voluntary activation and normalised electromyographic activity), and peripheral neuromuscular indices (evoked torque and M-wave amplitude), and muscle soreness were assessed before (PRE), immediately after (POST), 1 h (1H), and 1–4 days after exercise (D1, D2, D3, and D4).

Results

MVC torque decreased at only POST for CONC (− 52.8%), but remained below the baseline at POST (− 48.6%), 1H (− 34.1%), and D1–D4 (− 34.1 to − 18.2%) after ECC1, and at POST (− 45.2%), 1H (− 24.4%) and D1 (− 13.4%) after ECC2 (p < 0.05). Voluntary activation decreased immediately after ECC1 (− 21.6%) and ECC2 (− 21.1%), but not after CONC. Electrically evoked torques decreased similarly at POST and 1H for the three conditions, but remained below the baseline at D1 only post-ECC1.

Conclusion

These results showed that both central and peripheral factors contributed to the MVC decrease after ECC1 and ECC2, but the decrease was mainly due to peripheral factors after CONC.

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Abbreviations

DB:

Potentiated doublet amplitude evoked at rest

DBsup:

Superimposed doublet amplitude

EMG:

Electromyography

MMAX :

Maximal M wave

MVC:

Maximal voluntary contraction

2 :

Partial eta-squared

RF:

Rectus femoris

RMS:

Root mean square

VA:

Voluntary activation

VAS:

Visual analogue scale

VL:

Vastus lateralis

VM:

Vastus medialis

References

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Acknowledgements

The authors sincerely thank Clément Billet for his essential help during all the testing sessions.

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Authors and Affiliations

Authors

Contributions

RS was involved in the conception of the research, the acquisition, analysis, and interpretation of the data. RS was also involved in the revision of the manuscript. MJ and KN were involved in the conception of the research design, the analysis and interpretation of the results and the writing of the manuscript (revising the work). As the contributing author, MJ gave his final approval for submission.

Corresponding author

Correspondence to Marc Jubeau.

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Conflict of interest

The authors declare that they have no conflict of interest.

Additional information

Communicated by Nicolas Place.

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Souron, R., Nosaka, K. & Jubeau, M. Changes in central and peripheral neuromuscular fatigue indices after concentric versus eccentric contractions of the knee extensors. Eur J Appl Physiol 118, 805–816 (2018). https://doi.org/10.1007/s00421-018-3816-0

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  • DOI: https://doi.org/10.1007/s00421-018-3816-0

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