The effects of viscous loading of the human forearm flexors on the stability of coordination

Riek, S. (2004) The effects of viscous loading of the human forearm flexors on the stability of coordination. Human Movement Science, 23 3-4: 431-445. doi:10.1016/j.humov.2004.08.016

Author Riek, S.
Title The effects of viscous loading of the human forearm flexors on the stability of coordination
Journal name Human Movement Science   Check publisher's open access policy
ISSN 0167-9457
Publication date 2004-01-01
Year available 2004
Sub-type Article (original research)
DOI 10.1016/j.humov.2004.08.016
Open Access Status
Volume 23
Issue 3-4
Start page 431
End page 445
Total pages 15
Editor P.J. Beek
Place of publication Amsterdam
Publisher Elsevier BV
Language eng
Subject 321403 Motor Control
780108 Behavioural and cognitive sciences
Abstract This experiment investigated whether the stability of rhythmic unimanual movements is primarily a function of perceptual/spatial orientation or neuro-mechanical in nature. Eight participants performed rhythmic flexion and extension movements of the left wrist for 30 s at a frequency of 2.25 Hz paced by an auditory metronome. Each participant performed 8 flex-on-the-beat trials and 8 extend-on-the-beat trials in one of two load conditions, loaded and unload. In the loaded condition, a servo-controlled torque motor was used to apply a small viscous load that resisted the flexion phase of the movement only. Both the amplitude and frequency of the movement generated in the loaded and unloaded conditions were statistically equivalent. However, in the loaded condition movements in which participants were required to flex-on-the-beat became less stable (more variable) while extend-on-the-beat movements remained unchanged compared with the unload condition. The small alteration in required muscle force was sufficient to result in reliable changes in movement stability even a situation where the movement kinematics were identical. These findings support the notion that muscular constraints, independent of spatial dependencies, can be sufficiently strong to reliably influence coordination in a simple unimanual task.
Keyword Cognitive Sciences
Motor variability
Coordination stability
Sport Sciences
Psychology, Experimental
Q-Index Code C1
Institutional Status UQ

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Created: Tue, 20 Mar 2007, 00:03:30 EST by Kaye Eldridge on behalf of School of Human Movement and Nutrition Sciences