An in vivo animal model for the investigation of acute and chronic skeletal muscle injury.
Cutlip-RG; Wirth-O; Miller-R; Geronilla-K; Mowrey-K
Advances in Occupational Ergonomics and Safety: XVth Annual Conference of the International Society for Occupational Ergonomics and Safety, Fairfax, Virgina, June 4 - 7, 2001. AC Bittner Jr, PC Champney, SJ Morrissey, eds., Washington, DC: IOS Press, 2001 Jan; 4:394-401
An in vivo model to study skeletal muscle injury is described. A computer-controlled custom-designed rat dynamometer is used to control biomechanical inputs such as range of motion, velocity, acceleration, and number of repetitions to study skeletal muscle injury in rats. Anesthetized rats are placed supine in the dynamometer and the left foot placed in a load cell with the ankle axis aligned with the axis of rotation of the motor. Platinum electrodes are placed subcutaneously to branch either the peroneal nerve (to activate the dorsi flexor muscles of the hind limb) or the tibial nerve (to activate the plantar flexor muscles of the hind limb). The free ends of the wire electrodes are connected to a computer-controlled nerve stimulator. The dynamometer can be programmed to produced controlled angular movement about the ankle axis to generate isometric, concentric, and reciprocal concentric/eccentric muscle actions of either the plantar flexor or dorsi flexor muscles. This model has distinct advantages as compared to invasive in vitro or in situ preparations of isolated muscles or muscle fibers. Muscle response and injury can be studied in a more physiologically representative fashion with the neural and vascular supplies and muscle-tendon complexes intact. The non-invasive features of this model are well suited for the study of chronic muscle injury. When the biomechanical data from the dynamometer are combined with histological and biochemical analyses of muscle tissue, this model can provide comprehensive data for studying acute and chronic skeletal muscle pathomechanics.
In-vivo-studies; Laboratory-animals; Animals; Animal-studies; Models; Skeletal-system-disorders; Musculoskeletal-system-disorders; Injuries; Muscle-tissue
Bittner-AC Jr.; Champney-PC; Morrissey-SJ
Advances in Occupational Ergonomics and Safety: XVth Annual Conference of the International Society for Occupational Ergonomics and Safety, Fairfax, Virgina, June 4 - 7, 2001