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Effects of long- and short-term fatiguing stretch-shortening cycle exercises on reflex EMG and force of the tendon-muscle complex

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Abstract

This study examined the fatigue effects of stretch-shortening cycle exercises of different intensity and duration on stretch reflex EMG and mechanical responses of the triceps surae muscle. Twelve subjects performed either a 10-km run (n=6) or short but exhaustive rebound exercise on a sledge apparatus (n=6). Passive reflex tests (mechanically induced ankle dorsiflexions) were examined before, after as well as 2 h, 2 and 7 days after exercise. Mechanical reflex responses were recorded from the ergometer torque signal. An acute contractile failure was observed as large reductions in twitch responses, especially in the sledge subgroup who showed high post-exercise peak blood lactate and an increased EMG/torque ratio. Independently of the exercise, the delayed fatigue analysis revealed strong relationships between the reflex-induced EMG and mechanical changes. In addition to muscle damage, these results may be explained by inhibitory effects via the sensitisation of small muscle afferents particularly during the exercise-induced delayed recovery process.

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Acknowledgements

The authors would like to acknowledge the assistance of Ms. Taija Finni, Pirkko Puttonen, Marja-Liisa Romppanen, Sirpa Roivas and Mr. Markku Ruuskanen for technical support. This study was supported in part by a grant (121/722/2000) from the Ministry of Education (Finland).

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Authors and Affiliations

  1. Neuromuscular Research Center, Department of Biology of Physical Activity, University of Jyväskylä, PO Box 35 (LL), Jyväskylä, Finland

    S. Kuitunen, H. Kyröläinen, J. Avela & P. V. Komi

  2. UPRES EA3285, Department of Biology of Physical Activity, University of the Mediterranean, 163 avenue de Luminy, 13288, Marseille Cedex 9, France

    C. Nicol

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  1. C. Nicol
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  2. S. Kuitunen
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  3. H. Kyröläinen
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  4. J. Avela
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  5. P. V. Komi
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Correspondence to P. V. Komi.

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Nicol, C., Kuitunen, S., Kyröläinen, H. et al. Effects of long- and short-term fatiguing stretch-shortening cycle exercises on reflex EMG and force of the tendon-muscle complex. Eur J Appl Physiol 90, 470–479 (2003). https://doi.org/10.1007/s00421-003-0862-y

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