Motor-unit coherence and its relation with synchrony are influenced by training

Semmler, John G., Sale, Martin V., Meyer, François G. and Nordstrom, Michael A. 2004, Motor-unit coherence and its relation with synchrony are influenced by training, Journal of neurophysiology, vol. 92, no. 6, pp. 3320-3331.

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Title Motor-unit coherence and its relation with synchrony are influenced by training
Author(s) Semmler, John G.
Sale, Martin V.
Meyer, François G.
Nordstrom, Michael A.
Journal name Journal of neurophysiology
Volume number 92
Issue number 6
Start page 3320
End page 3331
Publisher American Physiological Society
Place of publication Bethesada, Md.
Publication date 2004-12
ISSN 0022-3077
1522-1598
Summary The purpose of the study was to quantify the strength of motor-unit coherence from the left and right first dorsal interosseous muscles in untrained, skill-trained (musicians), and strength-trained (weightlifters) individuals who had long-term specialized use of their hand muscles. The strength of motor-unit coherence was quantified from a total of 394 motor-unit pairs in 13 subjects using data from a previous study in which differences were found in the strength of motor-unit synchronization depending on training status. In the present study, we found that the strength of motor-unit coherence was significantly greater in the left compared with the right hand of untrained right-handed subjects with the largest differences observed between 21 and 24 Hz. The strength of motor-unit coherence was lower in both hands of skill-trained subjects (21–27 Hz) and the right (skilled) hand of untrained subjects (21–24 Hz), whereas the largest motor-unit coherence was observed in both hands of strength-trained subjects (3–9 and 21–27 Hz). A strong curvilinear association was observed between motor-unit synchronization and the integral of coherence at 10–30 Hz in all motor-unit pairs (r2 = 0.77), and was most pronounced in strength-trained subjects (r2 = 0.90). Furthermore, this association was accentuated when using synchronization data with broad peaks (>11 ms), suggesting that the 10- to 30-Hz coherence is due to oscillatory activity in indirect branched common inputs. The altered coherence with training may be due to an interaction between cortical inhibition and the number of direct common inputs to motor neurons in skill- or strength-trained hands.
Language eng
Field of Research 110905 Peripheral Nervous System
HERDC Research category C1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30002486

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