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Comparison of corticomotor excitability during visuomotor dynamic and static tasks

Pearce, Alan J and Kidgell, Dawson J (2010) Comparison of corticomotor excitability during visuomotor dynamic and static tasks. Journal of Science and Medicine in Sport, 13 (1). pp. 167-171. ISSN 1440-2440

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Abstract

The human central nervous system (CNS) has the ability to modulate its activity during the performance of different movements. Recent evidence, however, suggests that the CNS can also modulate its activity in the same movement but with increased precision during a visuomotor static task. This study aimed to extend on these findings by using transcranial magnetic stimulation (TMS) to measure the CNS during the performance of two visuomotor dynamic tasks. Twelve volunteers participated in this study, performing two separate motor tasks. Study I (“Position Tracking”) involved participants to perform a visuomotor tracking task using a dial potentiometer and matching their response icon to the computer generated tracking icon whilst holding a pincer grip. Study II (“Force Tracking”) involved participants to perform a similar visuomotor tracking task by applying or releasing pressure against a fixed force transducer. Tasks were conducted at two speeds (“slow” being one tracking cycle in 10 s; and “fast” being two tracking cycles in 10 s) and compared to a visuomotor static task at a similar muscle contraction level. Results showed corticospinal changes with significant increases (p = 0.002) in excitability demonstrated during Study I (42.3±16.8%) and Study II (56.3±34.2%) slow speed tasks. Moreover, significant reduction in corticospinal inhibition was also observed during both tracking tasks at slow (59.3±13.7%; p = 0.001) and fast speeds (31.9±12.3%; p = 0.001). The findings may provide information on the underlying physiology during the early stages of motor skill acquisition.

Item Type: Article
Uncontrolled Keywords: ResPubID18226, transcranial magnetic stimulation; motor-evoked potentials; motor skills; motor cortex
Subjects: Faculty/School/Research Centre/Department > Centre for Ageing, Rehabilitation, Exercise & Sport Science (CARES)
FOR Classification > 1006 Computer Hardware
SEO Classification > 970111 Expanding Knowledge in the Medical and Health Sciences
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Depositing User: VUIR
Date Deposited: 21 Nov 2011 04:15
Last Modified: 13 Jan 2015 04:22
URI: http://vuir.vu.edu.au/id/eprint/4523
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Citations in Scopus: 7 - View on Scopus

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