Effects of intermanual transfer induced by repetitive precision grip on input-output properties of untrained contralateral limb muscles

Experimental Brain Research Volume 182 Issue 4 Page 459-467 published_at 2007-10
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Title ( eng )
Effects of intermanual transfer induced by repetitive precision grip on input-output properties of untrained contralateral limb muscles
Creator
Ni Zhen
Yahagi Susumu
Source Title
Experimental Brain Research
Volume 182
Issue 4
Start Page 459
End Page 467
Abstract
Although there were many reports relating to intermanual transfer of behavioral motor tasks in humans, it is still not well-known whether the transfer phenomenon between the trained and untrained hand is accompanied by corresponding changes in motor system. In the present study we applied transcranial magnetic stimulation to investigate the practice effects of unilateral fingertip precision grip on corticospinal excitability, regarding both the trained and untrained hand muscles. The results showed that after practice fingertip grip force became steady and safety margin dramatically decreased not only in the trained hand, but also in the untrained hand. Regarding MEP and background EMG (B.EMG) activities, the regression slope of MEP/B.EMG ratio in the first dorsal interosseous (FDI) muscle became significantly steeper after practice in both hands, but in the thenar (TH) muscle there were no clear modulations. These results indicated that through practice qualitative or functional changes of corticospinal systems related to the reorganization for a fingertip precision grip prominently reflect only on FDI muscle which plays a dominant role in the task. More importantly, such effects were simultaneously seen in the untrained hand correspondent to the trained hand, i.e., changes of input-output property in M1 occur not only in the trained hand, but also in the untrained hand. Based on the present results, we suggest that training-induced neural adaptations of the central nervous system may include improvement of its predicting fingertip grip force for self-lifting of the object in the untrained hand.
Keywords
fingertip precision grip
international transfer
input-output property
motor evoked potential
MEP
transcranial magnetic stimulation
TMS
NDC
Sports and physical training [ 780 ]
Medical sciences [ 490 ]
Language
eng
Resource Type journal article
Publisher
Springer-Verlag
Date of Issued 2007-10
Rights
Copyright (c) 2007 Springer-Verlag
Publish Type Author’s Original
Access Rights open access
Source Identifier
[ISSN] 0014-4819
[DOI] 10.1007/s00221-007-1004-2
[NCID] AA00640970
[DOI] http://dx.doi.org/10.1007/s00221-007-1004-2