Corticospinal adaptations and strength maintenance in the immobilized arm following 3 weeks unilateral strength training

Pearce, A. J., Hendy, A., Bowen, W. A. and Kidgell, D. J. 2013, Corticospinal adaptations and strength maintenance in the immobilized arm following 3 weeks unilateral strength training, Scandinavian journal of medicine and science in sports, vol. 23, no. 6, pp. 740-748.

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Title Corticospinal adaptations and strength maintenance in the immobilized arm following 3 weeks unilateral strength training
Author(s) Pearce, A. J.
Hendy, A.
Bowen, W. A.
Kidgell, D. J.
Journal name Scandinavian journal of medicine and science in sports
Volume number 23
Issue number 6
Start page 740
End page 748
Total pages 9
Publisher Wiley-Blackwell Publishing, Inc.
Place of publication Malden, Mass.
Publication date 2013-12
ISSN 0905-7188
Keyword(s) transcranial magnetic stimulation
neuroplasticity
exercise
cross education
Summary Cross-education strength training has being shown to retain strength and muscle thickness in the immobilized contralateral limb. Corticospinal mechanisms have been proposed to underpin this phenomenon; however, no transcranial magnetic stimulation (TMS) data has yet been presented. This study used TMS to measure corticospinal responses following 3 weeks of unilateral arm training on the contralateral, immobilize arm. Participants (n = 28) were randomly divided into either immobilized strength training (Immob + train) immobilized no training (Immob) or control. Participants in the immobilized groups had their nondominant arm rested in a sling, 15 h/day for 3 weeks. The Immob + train group completed unilateral arm curl strength training, while the Immob and control groups did not undertake training. All participants were tested for corticospinal excitability, strength, and muscle thickness of both arms. Immobilization resulted in a group x time significant reduction in strength, muscle thickness and corticospinal excitability for the untrained limb of the Immob group. Conversely, no significant change in strength, muscle thickness, or corticospinal excitability occurred in the untrained limb of the Immob + train group. These results provide the first evidence of corticospinal mechanisms, assessed by TMS, underpinning the use of unilateral strength training to retain strength and muscle thickness following immobilization of the contralateral limb.
Language eng
Field of Research 110903 Central Nervous System
Socio Economic Objective 920412 Preventive Medicine
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2012, Wiley-Blackwell Publishing, Inc.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30045895

Document type: Journal Article
Collections: School of Psychology
School of Exercise and Nutrition Sciences
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