Journal article
Determining the Force-Length-Velocity Relations of the Quadriceps Muscles: III. A Pilot Study
Journal of applied biomechanics, Vol.15(2), pp.200-209
05/1999
DOI: 10.1123/jab.15.2.200
Abstract
The purpose of this study was to propose and evaluate a method for the in vivo determination of the force-length-velocity relations of individual quadriceps muscles. One female subject performed maximum effort knee extensions on an isokinetic dynamometer. The gravitational and inertial effects were taken into consideration when determining the resultant knee torque. Selected anatomical and geometric parameters of the quadriceps muscles were obtained from radiography and magnetic resonance imaging (MRI). Hill’s (1938) mechanical model was used to represent the force-velocity relation of a muscle at a given length, and the constants in Hill’s model were assumed to vary with muscle length. Experimentally determined knee torque and muscle shortening velocity data were used to determine the unknown parameters in the muscle model. The relation between each muscle parameter and muscle length for each muscle was obtained using regression analysis. On average, the muscle model overestimated the knee torque by 15.5 ± 5.1%. The overestimations may have resulted from the lack of low torque-high velocity data for the determination of muscle model parameters. When a set of fixed Hill constants was used, the knee torque was underestimated by 29.0 ± 10.6%. The results demonstrate the feasibility of the method proposed in this study.
Details
- Title: Subtitle
- Determining the Force-Length-Velocity Relations of the Quadriceps Muscles: III. A Pilot Study
- Creators
- John W. ChowWarren G. DarlingJames G. HayJames G. Andrews
- Resource Type
- Journal article
- Publication Details
- Journal of applied biomechanics, Vol.15(2), pp.200-209
- DOI
- 10.1123/jab.15.2.200
- ISSN
- 1065-8483
- eISSN
- 1543-2688
- Language
- English
- Date published
- 05/1999
- Academic Unit
- Mechanical Engineering; Physical Therapy and Rehabilitation Science; Health and Human Physiology
- Record Identifier
- 9984259658802771
Metrics
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