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Localized muscle pain causes prolonged recovery after fatiguing isometric contractions

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Abstract

The purpose of this study was to investigate the force and electromyographic (EMG) signal recorded from the muscles immediately after a sustained fatiguing contraction with or without muscle pain. Ten subjects performed sustained dorsi- and plantarflexions at two contraction levels (50 and 80% of maximum voluntary contraction) until exhaustion with or without muscle pain induced by injection of 6% hypertonic saline in one of the torque producing muscles. The muscle pain intensity was scored on a visual analogue scale (VAS, 0–10 cm). The root mean square (RMS) of the surface EMG signal from plantarflexors and dorsiflexors were estimated during maximum voluntary contractions (MVC) and ramp contractions before and after the fatiguing task at 0, 5, 10 and 15 min during the recovery phase. VAS scores immediately after the contractions with hypertonic saline (on average 3.2 ± 1.1 cm) progressively decreased during recovery and no pain was experienced 15 min after the contraction. After the painful contraction the RMS-EMG during MVC was on average decreased (23.4 ± 7.4%) compared to the non-painful condition both in muscles where pain was previously induced and in non-painful synergists. During recovery, the slope of the torque–EMG curve during ramp contraction was significantly decreased (28.4 ± 8.1%) after the painful contraction compared to the control contraction both for the muscle previously exposed to pain and also the other active synergists. The decreased EMG during recovery after painful contractions compared with control was not accompanied by significant reductions in force during MVC indicating a change in the strategy for motor unit recruitment. This study shows that localized muscle pain inhibits muscle activation and increases the effects of fatigue on EMG recovery curves both for painful and non-painful synergists probably by a central effect. These effects can modify the normal patterns of synergistic activation and can also generate overload problems in muscle pain patients if compensatory motor control strategies are applied.

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Acknowledgment

The Danish Technical Research Council supported this work.

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Authors and Affiliations

  1. Laboratory for Experimental Pain Research, Center for Sensory-Motor Interaction (SMI), Aalborg University, Fredrik Bajers Vej 7D-3, 9220, Aalborg E, Denmark

    Andrei Ciubotariu, Lars Arendt-Nielsen & Thomas Graven-Nielsen

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  1. Andrei Ciubotariu
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  2. Lars Arendt-Nielsen
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  3. Thomas Graven-Nielsen
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Correspondence to Thomas Graven-Nielsen.

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Ciubotariu, A., Arendt-Nielsen, L. & Graven-Nielsen, T. Localized muscle pain causes prolonged recovery after fatiguing isometric contractions. Exp Brain Res 181, 147–158 (2007). https://doi.org/10.1007/s00221-007-0913-4

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  • DOI: https://doi.org/10.1007/s00221-007-0913-4

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