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  • Title: Influence of knee joint angle on muscle properties of paralyzed and nonparalyzed human knee extensors.
    Author: Gerrits KH, Maganaris CN, Reeves ND, Sargeant AJ, Jones DA, de Haan A.
    Journal: Muscle Nerve; 2005 Jul; 32(1):73-80. PubMed ID: 15795891.
    Abstract:
    Muscles of individuals with a spinal cord injury (SCI) exhibit an unexpected leftward shift in the force (torque)-frequency relationship. We investigated whether differences in torque-angle relationships between SCI and able-bodied control muscles could explain this shift. Electrically stimulated knee-extensor contractions were obtained at knee flexion angles of between 30 degrees and 90 degrees. Torque-frequency relationships were obtained at 30 degrees, 90 degrees, and optimum angle. Optimum angle was not different between groups but SCI-normalized torques were lower at the extreme angles. At all angles, SCI muscles produced higher relative torques at low stimulation frequencies. Thus, there was no evidence of a consistent change in the length of paralyzed SCI muscles, and the anomalous leftward shift in the torque-frequency relationship was not the result of testing the muscle at a relatively long length. The results provide valuable information about muscle changes occurring in various neurological disorders.
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