Reciprocal aiming precision and central adaptations as a function of mechanical constraints

Deschamps, Thibault, Murian, Alexandre and Hug, Francois (2011) Reciprocal aiming precision and central adaptations as a function of mechanical constraints. Journal of Electromyography and Kinesiology, 21 6: 968-973. doi:10.1016/j.jelekin.2011.08.009


Author Deschamps, Thibault
Murian, Alexandre
Hug, Francois
Title Reciprocal aiming precision and central adaptations as a function of mechanical constraints
Journal name Journal of Electromyography and Kinesiology   Check publisher's open access policy
ISSN 1050-6411
1873-5711
Publication date 2011-12
Year available 2011
Sub-type Article (original research)
DOI 10.1016/j.jelekin.2011.08.009
Volume 21
Issue 6
Start page 968
End page 973
Total pages 6
Place of publication London, United Kingdom
Publisher Elsevier
Collection year 2012
Language eng
Formatted abstract
The present study investigated the influence of mechanical constraints (load and movement velocity) on the movement accuracy during a reciprocal aiming precision task. Seven participants had to point rhythmically and alternatively (with flexion-extension of the right elbow) a cursor at two targets as accurately as possible. Two loads (applied to the limb effectors; 500 and 2500g), two movement frequencies (1.25 and 1.75Hz) as well as two target sizes (1 and 5cm) were manipulated. Surface EMG activity of both biceps brachii and triceps brachii was recorded. Attentional demands, reflecting the central cost associated with the performance of aiming movements was assessed using a dual-task paradigm (via a probe reaction time task - RT). While the results demonstrated a significant degradation of pointing accuracy with mechanical loading (mean absolute error - AE for 500g load: 0.32mm±0.64; mean AE for 2500g load: 0.51±0.74mm), no significant effect of movement frequency was found. For the two mechanical constraints, the mental effort to meet the task demands remained the same (mean RT -500g: 370±123ms; mean RT -2500g: 395±119ms). Electromyographic activity of both biceps brachii and triceps brachii muscles evidenced neural adaptations to changes in mechanical constraints. Put together, the present findings suggest that the cause of the observed loss of movement accuracy may probably result from more peripheral alterations such as an impairment of the afferent information processing
Keyword Movement accuracy
Attention
Motor control
Single Joint Movements
Attentional Demands
Neural Compensation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Health and Rehabilitation Sciences Publications
 
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Created: Wed, 28 Aug 2013, 16:09:15 EST by Francois Hug on behalf of School of Health & Rehabilitation Sciences