Abstract：
:Our previous study revealed that, during tonic muscle contraction, remarkable functional differences among intrinsic and extrinsic muscles were observed during two different grip movements, i.e., precision and power grips. To verify whether this evidence is true even under the phasic muscle contraction, magnetic stimulation was delivered over the left scalp while a normal human subject performed phasic precision or power grip responses of the right-hand fingers in a simple reaction time (SRT) paradigm. Magnetic stimulation delivered during the latent period revealed different cortico-motoneuronal excitations between the two grip responses. In particular, the contributions of extensor carpi radialis (ECR) muscle were definitely different between the two grip responses, although motor-evoked potentials (MEPs) of first dorsal interosseous (FDI) prior to, and after EMG onset of movement initiation, were not different. These results were similar to previous results obtained during tonic muscle contraction. Thus, we have concluded that the task-dependent EMG discharge pattern in finger manipulation could not be modulated by muscle contraction modes.
journal_name
Brain Resjournal_title
Brain researchauthors
Anson JG,Hasegawa Y,Kasai T,Latash ML,Yahagi Sdoi
10.1016/s0006-8993(02)02368-5subject
Has Abstractpub_date
2002-05-03 00:00:00pages
162-6issue
2eissn
0006-8993issn
1872-6240pii
S0006899302023685journal_volume
934pub_type
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