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Power and work produced in different leg muscle groups when rising from a chair.
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Power and work produced in different leg muscle groups when rising from a chair.

Author: P Wretenberg Affiliation: Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden.; UP Arborelius
Edition/Format: Article Article : English
Publication:European journal of applied physiology and occupational physiology, 1994; 68(5): 413-7
Database:From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
Summary:
The aim of this study was to determine the power output and work done by different muscle groups at the hip and knee joints during a rising movement, to be able to tell the degree of activation of the muscle groups and the relationship between concentric and eccentric work. Nine healthy male subjects rose from a chair with the seat at knee level. The moments of force about the hip and knee joints were calculated  Read more...
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Details

Document Type: Article
All Authors / Contributors: P Wretenberg Affiliation: Department of Neuroscience, Karolinska Institutet, Stockholm, Sweden.; UP Arborelius
ISSN:0301-5548
Language Note: English
Unique Identifier: 119924400
Awards:

Abstract:

The aim of this study was to determine the power output and work done by different muscle groups at the hip and knee joints during a rising movement, to be able to tell the degree of activation of the muscle groups and the relationship between concentric and eccentric work. Nine healthy male subjects rose from a chair with the seat at knee level. The moments of force about the hip and knee joints were calculated semidynamically. The power output (P) and work in the different muscle groups surrounding the joints was calculated as moment of force times joint angular velocity. Work was calculated as: work = integral of P dt. The mean peak concentric power output was for the hip extensors 49.9 W, hip flexors 7.9 W and knee extensor 89.5 W. This power output corresponded to a net concentric work of 20.7 J, 1.0 J and 55.6 J, respectively. There was no concentric power output from the knee flexor muscles. Energy absorption through eccentric muscle action was produced by the hip extensors and hip flexors with a mean peak power output of 4.8 W and 7.4 W, respectively. It was concluded that during rising, the hip and knee muscles mainly worked concentrically and that the greatest power output and work were produced during concentric contraction of the knee and hip extensor muscles. There was however also a demand for eccentric work by the hip extensors as well as both concentric and eccentric work by the hip flexors. The knee flexor muscles were unloaded.

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