An existing rheological model of skeletal muscle (Forcinito et al., 1998) was modified with a nonlinear Maxwell fluid element to provide a phenomenological model capable of analyzing the strain-stiffening behavior typically found in passive, and occasionally observed in active, skeletal muscle. This new model describes both active and passive muscular behavior as a combination of the behavior of each model component, without requiring prior knowledge of the force-length or force-velocity characteristics of the muscle.
Human Performance Laboratory, University of Calgary, 2500 University Dr., Calgary, AB, Canada T2N 1N4
Dept. of Mechanical Engineering
Dept. of Orthopedics and Rehabilitation
Dept. of Biomedical Engineering
Dept. of Family Medicine, University of Wisconsin-Madison, Madison, WI 53706.