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Reduced contribution of the ipsilateral primary motor cortex to force modulation with short-term motor learning in humans: An NIRS study

Kenichi Shibuya¹, Masako Iwadate², & Tomoko Sadamoto¹

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1. Research Institute of Physical Fitness, Japan Women’s College of Physical Education, 8-19-1 Kita-Karasuyama, Setagaya-ku, Tokyo 157-8565, Japan
2. College of Humanities and Sciences, Nihon University, 3-25-40 Sakurajyosui, Setagaya-ku, Tokyo 156-8550, Japan

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Date:

Received 07 May 2008 05:00 UTC; Posted 08 May 2008

Subjects:

Neuroscience

Tags:

• learning
• motor
• cortex
• neuroscience

Abstract:

How is muscle force modulated during hand exercise? Oxygenation in the contralateral primary motor cortex (M1) has been observed to vary considerably across trials of repetitive handgrip exercise. No linear relationship was observed between the average value of oxygenation determined by a block design study and the force of the handgrip. We found reduced oxygenation in the ipsilateral M1 and unchanged oxygenation in the contralateral M1 during repetitive static handgrip exercises (40% and 60% maximal voluntary contraction; 10 s exercise/75 s rest; 5 sets), which might be due to short-term motor learning. These results support the hypothesis that the ipsilateral M1 might functionally compensate for the contralateral M1 in force modulation during unilateral exercises.

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This document is licensed to the public under the Creative Commons Attribution 3.0 License

How to cite this document:

Shibuya, Kenichi, Iwadate, Masako, and Sadamoto, Tomoko. Reduced contribution of the ipsilateral primary motor cortex to force modulation with short-term motor learning in humans: An NIRS study. Available from Nature Precedings <http://hdl.handle.net/10101/npre.2008.1865.1> (2008)

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