Cerebral activation during the exertion of sustained static force in man.

Details

Serval ID
serval:BIB_60E73D7584E4
Type
Article: article from journal or magazin.
Collection
Publications
Title
Cerebral activation during the exertion of sustained static force in man.
Journal
Neuroreport
Author(s)
Dettmers C., Lemon R.N., Stephan K.M., Fink G.R., Frackowiak R.S.
ISSN
0959-4965 (Print)
ISSN-L
0959-4965
Publication state
Published
Issued date
1996
Volume
7
Number
13
Pages
2103-2110
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov'tPublication Status: ppublish
Abstract
The aim of our study was to determine alterations of cerebral activity during prolonged static force exertion. Regional cerebral blood flow (rCBF) was measured using H2(15)O positron emission tomography (PET) while six male normal subjects pressed a morse-key with their right index finger with a constant force of 20% of their maximal voluntary contraction (MVC) for different periods of time (1.5-4.5 min). Exertion of static force led to activation which was at least as extensive as that during exertion of repetitive dynamic force pulses. Despite a considerable sense of fatigue and increased effort at the end of a 4.5 min key press, no compensatory changes of activity were detected in motor or sensory related structures. The right dorsolateral prefrontal cortex demonstrated a significant correlation between rCBF and duration of key-press, possibly reflecting processes over-riding fatigue. Prominent basal ganglia activation was demonstrated in this static force task, but not in a previous force task involving repetitive dynamic force pulses. This suggests that sustained exertion of a static force is an active process modulated, at least in part, by the basal ganglia.
Keywords
Adult, Brain/blood supply, Brain/physiology, Brain Mapping, Cerebrovascular Circulation, Electromyography, Fingers/innervation, Functional Laterality, Humans, Male, Muscle, Skeletal/innervation, Oxygen Radioisotopes/diagnostic use, Physical Exertion, Tomography, Emission-Computed
Pubmed
Web of science
Create date
16/09/2011 18:31
Last modification date
20/08/2019 14:18
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