Murdoch University Research Repository

Welcome to the Murdoch University Research Repository

The Murdoch University Research Repository is an open access digital collection of research
created by Murdoch University staff, researchers and postgraduate students.

Learn more

Primary sensorimotor cortex activation with task-performance after fatiguing hand exercise

Benwell, N.M., Byrnes, M.L., Mastaglia, F.L. and Thickbroom, G.W. (2005) Primary sensorimotor cortex activation with task-performance after fatiguing hand exercise. Experimental Brain Research, 167 (2). pp. 160-164.

Link to Published Version: http://dx.doi.org/10.1007/s00221-005-0013-2
*Subscription may be required

Abstract

We have compared functional MRI signals in primary sensorimotor cortex (SM1) during a paced motor task of each hand before and after unimanual (right hand) fatiguing exercise. Our aims were to determine whether the degree of activation is different when a motor task is performed after a fatiguing exercise, and whether there are any differences in activation between movement of the fatigued and non-fatigued hands. There was a significant reduction in the number of voxels activated in SM1 in the hemisphere contralateral to movement of both the fatigued hand (38±5 pre-exercise versus 21±3 post-exercise; P<0.05) and the non-fatigued hand (32±4 pre-exercise vs 18±4 post-exercise; P<0.05). There was no significant difference in the magnitude of the functional magnetic resonance imaging signal before or after exercise, however, the variance increased significantly after exercise (6.0±0.5 pre-exercise vs 7.3±0.6 post-exercise; P<0.01). Reduced functional activation in SM1 may reflect increased variability in the activation rather than a reduction in activation of cortical motor networks after fatigue.

Item Type: Journal Article
Publisher: Springer-Verlag Berlin Heidelberg
URI: http://researchrepository.murdoch.edu.au/id/eprint/25691
Item Control Page Item Control Page