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Lienhard K, Cabasson A, Meste O, et al. sEMG during Whole-Body Vibration Contains Motion Artifacts and Reflex Activity. J Sports Sci Med. 2015;14(1):54-61
Lienhard, K., Cabasson, A., Meste, O., & Colson, S. S. (2015). sEMG during Whole-Body Vibration Contains Motion Artifacts and Reflex Activity. Journal of sports science & medicine, 14(1), 54-61.
Lienhard, Karin, et al. "sEMG during Whole-Body Vibration Contains Motion Artifacts and Reflex Activity." Journal of sports science & medicine vol. 14,1 (2015): 54-61.
Lienhard K, Cabasson A, Meste O, Colson SS. sEMG during Whole-Body Vibration Contains Motion Artifacts and Reflex Activity. J Sports Sci Med. 2015 Mar 01;14(1):54-61. eCollection 2015 Mar. PMID: 25729290; PMCID: PMC4306783.
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J Sports Sci Med. 2015 Mar 01;14(1):54-61. eCollection 2015 Mar.

sEMG during Whole-Body Vibration Contains Motion Artifacts and Reflex Activity.

Journal of sports science & medicine

Karin Lienhard, Aline Cabasson, Olivier Meste, Serge S Colson

Affiliations

  1. University of Nice Sophia Antipolis , CNRS, I3S, UMR7271, Sophia Antipolis, France ; University of Nice Sophia Antipolis , LAMHESS, EA 6309, Nice, France; University of Toulon, LAMHESS, EA 6309, La Garde, France.
  2. University of Nice Sophia Antipolis , CNRS, I3S, UMR7271, Sophia Antipolis, France.

PMID: 25729290 PMCID: PMC4306783

Abstract

The purpose of this study was to determine whether the excessive spikes observed in the surface electromyography (sEMG) spectrum recorded during whole-body vibration (WBV) exercises contain motion artifacts and/or reflex activity. The occurrence of motion artifacts was tested by electrical recordings of the patella. The involvement of reflex activity was investigated by analyzing the magnitude of the isolated spikes during changes in voluntary background muscle activity. Eighteen physically active volunteers performed static squats while the sEMG was measured of five lower limb muscles during vertical WBV using no load and an additional load of 33 kg. In order to record motion artifacts during WBV, a pair of electrodes was positioned on the patella with several layers of tape between skin and electrodes. Spectral analysis of the patella signal revealed recordings of motion artifacts as high peaks at the vibration frequency (fundamental) and marginal peaks at the multiple harmonics were observed. For the sEMG recordings, the root mean square of the spikes increased with increasing additional loads (p < 0.05), and was significantly correlated to the sEMG signal without the spikes of the respective muscle (r range: 0.54 - 0.92, p < 0.05). This finding indicates that reflex activity might be contained in the isolated spikes, as identical behavior has been found for stretch reflex responses evoked during direct vibration. In conclusion, the spikes visible in the sEMG spectrum during WBV exercises contain motion artifacts and possibly reflex activity. Key pointsThe spikes observed in the sEMG spectrum during WBV exercises contain motion artifacts and possibly reflex activityThe motion artifacts are more pronounced in the first spike than the following spikes in the sEMG spectrumReflex activity during WBV exercises is enhanced with an additional load of approximately 50% of the body mass.

Keywords: Stretch reflex; filtering; frequency analysis; power spectral density; spectral linear interpolation; vibration training

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