Dynamometer for rat plantar flexor musclesin vivo |
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Authors: | R G Cutlip Dr W T Stauber R H Willison T A McIntosh K H Means |
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Institution: | (1) Department of Mechanical & Aerospace Engineering, West Virginia University, PO Box 9229, 26506 Morgantown, WV, USA;(2) Department of Physiology, West Virginia University, PO Box 9229, 26506 Morgantown, WV, USA;(3) Department of Neurology, West Virginia University, PO Box 9229, 26506 Morgantown, WV, USA |
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Abstract: | A dynamometer is designed and fabricated to measure the force output during static and dynamic muscle actions of the plantar
flexor muscles of anaesthetised rats in vivo. The design is based on a computer-controlled DC servomotor capable of angular
velocities in excess of 17.5 rad s−1. The system controls the range of motion, angular velocity and electrical stimulation of the muscles, while monitoring the
force output at the plantar surface of the foot. The force output is measured by a piezo-electric load cell that is rated
at 5 kg capacity. Angular velocity and position are measured by a DC tachometer and potentiometer, respectively. All measurement
devices are linear (r2=0.9998). The design minimises inertial loading during high-speed angular motions, with a variation in force output of less
than 0.2%. The dynamometer proves to be an accurate and reliable system for quantifying static and dynamic forces of rat plantar
flexor muscles in vivo. |
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Keywords: | Dynamometer Plantar flexor muscles In vivo Servomotor Load cell Force output Rats |
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