Comparison in muscle damage between maximal voluntary and electrically evoked isometric contractions of the elbow flexors

Jubeau, Marc, Muthalib, Makii, Millet, Guillaume Y., Maffiuletti, Nicola A. and Nosaka, Kazunori 2012, Comparison in muscle damage between maximal voluntary and electrically evoked isometric contractions of the elbow flexors, European journal of applied physiology, vol. 112, no. 2, pp. 429-438, doi: 10.1007/s00421-011-1991-3.

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Title Comparison in muscle damage between maximal voluntary and electrically evoked isometric contractions of the elbow flexors
Author(s) Jubeau, Marc
Muthalib, Makii
Millet, Guillaume Y.
Maffiuletti, Nicola A.
Nosaka, Kazunori
Journal name European journal of applied physiology
Volume number 112
Issue number 2
Start page 429
End page 438
Total pages 10
Publisher Springer
Place of publication Heidelberg, Germany
Publication date 2012-02
ISSN 1439-6319
Keyword(s) electrostimulation
muscle length
delayed onset muscle soreness
creatine kinase
muscle temperature
Elbow Joint
Electric Stimulation
Muscle Fatigue
Muscle, Skeletal
Physical Endurance
Young Adult
Summary This study compared between maximal voluntary (VOL) and electrically stimulated (ES) isometric contractions of the elbow flexors for changes in indirect markers of muscle damage to investigate whether ES would induce greater muscle damage than VOL. Twelve non-resistance-trained men (23-39 years) performed VOL with one arm and ES with the contralateral arm separated by 2 weeks in a randomised, counterbalanced order. Both VOL and ES (frequency 75 Hz, pulse duration 250 μs, maximally tolerated intensity) exercises consisted of 50 maximal isometric contractions (4-s on, 15-s off) of the elbow flexors at a long muscle length (160°). Changes in maximal voluntary isometric contraction torque (MVC), range of motion, muscle soreness, pressure pain threshold and serum creatine kinase (CK) activity were measured before, immediately after and 1, 24, 48, 72 and 96 h following exercise. The average peak torque over the 50 isometric contractions was greater (P < 0.05) for VOL (32.9 ± 9.8 N m) than ES (16.9 ± 6.3 N m). MVC decreased greater and recovered slower (P < 0.05) after ES (15% lower than baseline at 96 h) than VOL (full recovery). Serum CK activity increased (P < 0.05) only after ES, and the muscles became more sore and tender after ES than VOL (P < 0.05). These results showed that ES induced greater muscle damage than VOL despite the lower torque output during ES. It seems likely that higher mechanical stress imposed on the activated muscle fibres, due to the specificity of motor unit recruitment in ES, resulted in greater muscle damage.
Language eng
DOI 10.1007/s00421-011-1991-3
Field of Research 110699 Human Movement and Sports Science not elsewhere classified
1106 Human Movement And Sports Science
Socio Economic Objective 970111 Expanding Knowledge in the Medical and Health Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2011, Springer
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Document type: Journal Article
Collections: Faculty of Health
School of Exercise and Nutrition Sciences
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