Enhanced physiological tremor deteriorates plantar flexor torque steadiness after bed rest

Mulder, Edwin R., Horstman, Astrid M., Gerrits, Karin, Massa, Mark, Kleine, Bert U., de Haan, Arnold, Belavý, Daniel L., Felsenberg, Dieter, Zwarts, Machiel and Stegeman, Dick F. 2011, Enhanced physiological tremor deteriorates plantar flexor torque steadiness after bed rest, Journal of electromyography and kinesiology, vol. 21, no. 2, pp. 384-393, doi: 10.1016/j.jelekin.2010.10.009.

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Title Enhanced physiological tremor deteriorates plantar flexor torque steadiness after bed rest
Author(s) Mulder, Edwin R.
Horstman, Astrid M.
Gerrits, Karin
Massa, Mark
Kleine, Bert U.
de Haan, Arnold
Belavý, Daniel L.ORCID iD for Belavý, Daniel L. orcid.org/0000-0002-9307-832X
Felsenberg, Dieter
Zwarts, Machiel
Stegeman, Dick F.
Journal name Journal of electromyography and kinesiology
Volume number 21
Issue number 2
Start page 384
End page 393
Total pages 10
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2011-04
ISSN 1873-5711
Keyword(s) Science & Technology
Life Sciences & Biomedicine
Sport Sciences
Neurosciences & Neurology
Triceps surae
Torque fluctuation
Summary This study evaluated the effectiveness of resistance training to preserve submaximal plantar flexor (PF) torque steadiness following 60 days of bed rest (BR). Twenty-two healthy male subjects underwent either BR only (CTR, n=8), or BR plus resistance training (RT, n=14). The magnitude of torque fluctuations during steady submaximal isometric PF contractions (20%, 40%, 60% and 80% of maximum) were assessed before and after BR. Across contraction intensities, torque fluctuations (coefficient of variation, CV) increased more (P<0.05) after BR for CTR (from 0.31±0.10 to 0.92±0.63; P<0.001), than for RT (from 0.30±0.09 to 0.54±0.27; P<0.01). A shift in the spectral content of torque fluctuations towards increased rhythmic activity between 6.5 and 20Hz was observed in CTR only (P<0.05). H-reflex amplitude (H(max)/M(max) ratio) declined across groups from 0.57±0.18 before BR to 0.44±0.14 following BR (P<0.01) without correlation to CV. The present study showed that increased torque fluctuation after BR resulted from enhanced physiological tremor. Resistance training prevented the spectral shift in isometric PF torque fluctuation and offset ∼50% of the decline in performance associated with long-term BR.
Language eng
DOI 10.1016/j.jelekin.2010.10.009
Field of Research 110699 Human Movement and Sports Science not elsewhere classified
Socio Economic Objective 920299 Health and Support Services not elsewhere classified
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2010, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30071026

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