Reduction in corticospinal inhibition in the trained and untrained limb following unilateral leg strength training

Latella, Christopher, Kidgell, Dawson J. and Pearce, Alan J. 2012, Reduction in corticospinal inhibition in the trained and untrained limb following unilateral leg strength training, European journal of applied physiology, vol. 112, no. 8, pp. 3097-3107.

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Title Reduction in corticospinal inhibition in the trained and untrained limb following unilateral leg strength training
Author(s) Latella, Christopher
Kidgell, Dawson J.
Pearce, Alan J.
Journal name European journal of applied physiology
Volume number 112
Issue number 8
Start page 3097
End page 3107
Total pages 11
Publisher Springer
Place of publication Heidelberg, Germany
Publication date 2012-08
ISSN 1439-6319
1439-6327
Keyword(s) Strength
Transcranial magnetic stimulation
Cross-education
Unilateral training
Summary This study used transcranial magnetic stimulation to measure the corticospinal responses following 8 weeks of unilateral leg strength training. Eighteen healthy, non-strength trained participants (14 male, 4 female; 18–35 years of age) were matched for age, gender, and pre-training strength; and assigned to a training or control group. The trained group participated in unilateral horizontal leg press strength training, progressively overloaded and wave periodised, thrice per week for 8 weeks. Testing occurred prior to the intervention, at the end of 4 weeks and at the completion of training at 8 weeks. Participants were tested in both legs for one repetition maximum strength, muscle thickness, maximal electromyography (EMG) activity, and corticospinal excitability and inhibition. No changes were observed in muscle thickness in either leg. The trained leg showed an increase in strength of 21.2% (P = 0.001) and 29.0% (P = 0.007, compared to pre-testing) whilst the untrained contralateral leg showed 17.4% (P = 0.01) and 20.4% (P = 0.004, compared to pre-testing) increases in strength at 4 and 8 weeks, respectively. EMG and corticospinal excitability did not change; however, corticospinal inhibition was significantly reduced by 17.7 ms (P = 0.003) and 17.3 ms (P = 0.001) at 4 and 8 weeks, respectively, in the trained leg, and 25.1 ms (P = 0.001) and 20.8 ms (P = 0.001) at 4 and 8 weeks, respectively, in the contralateral untrained leg. This data support the theory of corticospinal adaptations underpinning cross-education gains in the lower limbs following unilateral strength training.
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 ©2011, Springer-Verlag
Persistent URL http://hdl.handle.net/10536/DRO/DU:30045894

Document type: Journal Article
Collection: School of Exercise and Nutrition Sciences
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