Journal article
Movement Accuracy Changes Muscle-Activation Strategies in Female Subjects During a Novel Single-Leg Weight-Bearing Task
PM & R, Vol.1(4), pp.319-328
2009
DOI: 10.1016/j.pmrj.2009.01.002
PMCID: PMC2763312
PMID: 19627914
Abstract
Understanding of how female subjects learn to move accurately during a resisted weight-bearing task is limited. The purpose of this study was to examine the muscle activation patterns used by female subjects in learning a novel single-leg squat (SLS) task under visual and nonvisual conditions.
Prospective training study.
University research setting.
Ten healthy young female participants.
Subjects tracked a sinusoidal target (knee displacement) during a resisted SLS exercise during the course of 4 days, under eyes open (EO) and eyes closed (EC) conditions with the use of a custom-designed weight-bearing exercise device.
The accuracy of performance in tracking the target and electromyographic activity (EMG) of 5 muscles around the knee were monitored.
Subjects improved their accuracy of performance by day 2 (40% decrease in error) and retained the accuracy on day 4. Error during the EC condition was 3 times greater than EO condition. Quadriceps-to-hamstrings coactivation ratio increased with the improved accuracy from the learning. Absence of visual feedback was accompanied by a decrease in the quadriceps-to-hamstrings coactivation ratio for this task.
The muscle synergistic activity around the knee changes as the accuracy of the task improves during a resisted weight-bearing task. This activation pattern represents a feed forward control plan that the central nervous system adopted to optimize accurate weight-bearing knee displacement. Rehabilitation specialists should consider manipulating the visual feedback and accuracy of performance when developing weight-bearing rehabilitation training protocols to improve neuromuscular control in female patients.
Details
- Title: Subtitle
- Movement Accuracy Changes Muscle-Activation Strategies in Female Subjects During a Novel Single-Leg Weight-Bearing Task
- Creators
- Sangeetha Madhavan - Neural Plasticity Lab/Rehab Institute of Chicago, Chicago, IL † † Disclosure: 8B NIHRichard K Shields - Graduate Program in Physical Therapy & Rehabilitation Science, The University of Iowa, 1-252 Medical Education Building, Iowa City, IA 52242-1190 ‡ ‡ Disclosure: 8B NIH
- Resource Type
- Journal article
- Publication Details
- PM & R, Vol.1(4), pp.319-328
- DOI
- 10.1016/j.pmrj.2009.01.002
- PMID
- 19627914
- PMCID
- PMC2763312
- NLM abbreviation
- PM R
- ISSN
- 1934-1482
- eISSN
- 1934-1563
- Publisher
- Elsevier Inc
- Grant note
- DOI: 10.13039/100000002, name: National Institutes of Health, award: NR0213478
- Language
- English
- Date published
- 2009
- Academic Unit
- Orthopedics and Rehabilitation; Physical Therapy and Rehabilitation Science
- Record Identifier
- 9984046828902771
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