Neural compensation for compliant loads during rhythmic movement

D C Mackey; D P Meichenbaum; J Shemmell; Stephan Riek; R G Carson

doi:10.1007/s00221-001-0946-z

Back

Neural compensation for compliant loads during rhythmic movement

Journal article

Peer reviewed

Neural compensation for compliant loads during rhythmic movement

D C Mackey, D P Meichenbaum, J Shemmell, Stephan Riek and R G Carson

Experimental Brain Research, Vol.142(3), pp.409-417

2002

DOI: https://doi.org/10.1007/s00221-001-0946-z

PMID: 11819050

Files and links (1)

url

https://doi.org/10.1007/s00221-001-0946-zView

Published Version

Abstract

Wrist - physiology

Acoustic Stimulation

Efferent Pathways - physiology

Humans

Periodicity

Adaptation, Physiological - physiology

Male

Feedback - physiology

Muscle, Skeletal - physiology

Brain - physiology

Psychomotor Performance - physiology

Weight-Bearing - physiology

Movement - physiology

Muscle Contraction - physiology

Adult

Female

Electromyography

An experiment was performed to characterise the movement kinematics and the electromyogram (EMG) during rhythmic voluntary flexion and extension of the wrist against different compliant (elastic-viscous-inertial) loads. Three levels of each type of load, and an unloaded condition, were employed. The movements were paced at a frequency of 1 Hz by an auditory metronome, and visual feedback of wrist displacement in relation to a target amplitude of 100 degree was provided. Electromyographic recordings were obtained from flexor carpi radialis (FCR) and extensor carpi radialis brevis (ECR). The movement profiles generated in the ten experimental conditions were indistinguishable, indicating that the CNS was able to compensate completely for the imposed changes in the task dynamics. When the level of viscous load was elevated, this compensation took the form of an increase in the rate of initial rise of the flexor and the extensor EMG burst. In response to increases in inertial load, the flexor and extensor EMG bursts commenced and terminated earlier in the movement cycle, and tended to be of greater duration. When the movements were performed in opposition to an elastic load, both the onset and offset of EMG activity occurred later than in the unloaded condition. There was also a net reduction in extensor burst duration with increases in elastic load, and an increase in the rate of initial rise of the extensor burst. Less pronounced alterations in the rate of initial rise of the flexor EMG burst were also observed. In all instances, increases in the magnitude of the external load led to elevations in the overall level of muscle activation. These data reveal that the elements of the central command that are modified in response to the imposition of a compliant load are contingent, not only upon the magnitude, but also upon the character of the load.

Details

Title: Neural compensation for compliant loads during rhythmic movement
Authors: D C Mackey (Author) - University of Queensland
D P Meichenbaum (Author) - University of Queensland
J Shemmell (Author) - University of Queensland
Stephan Riek (Author) - University of Queensland
R G Carson (Author) - University of Queensland
Publication details: Experimental Brain Research, Vol.142(3), pp.409-417
Publisher: Springer
DOI: 10.1007/s00221-001-0946-z
ISSN: 1432-1106
PMID: 11819050
Organisation Unit: University of the Sunshine Coast, Queensland; Graduate Research School
Language: English
Record Identifier: 99472599402621
Output Type: Journal article

Metrics

14 Record Views

12 Times Cited - Web of Science

InCites Highlights

These are selected metrics from InCites Benchmarking & Analytics tool, related to this output

Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Neurosciences

UN Sustainable Development Goals (SDGs)

This output has contributed to the advancement of the following goals:

Source: InCites