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An Investigation of Fatigue During the Flexion and Extension of the Knee as a Function of Velocity
ISSN: 0148-7191, e-ISSN: 2688-3627
Published July 09, 2001 by SAE International in United States
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This paper describes the work intended to supplement a previous study of Extravehicular Mobility Unit (EMU) strength fatigue data, collected from a variety of joints at a fixed velocity (60 degrees/second), by collecting torque data of a single joint (knee) over time, unsuited, under a condition of multiple fixed velocities. Knee flexion and extension torque values were evaluated for 8 subjects at 60, 120, 180, and 240 degrees per second. Subjects were considered “fatigued” when they reached 30% of the maximal voluntary contraction (MVC), or after 5 minutes of testing had elapsed.
Results indicated that over the five-minute testing period, subjects’ available torque output decreased to 40% of their MVC, and then reached a plateau at this level. For lower velocities, subjects gradually decreased from their MVC, but their overall decrease in torque over the five-minute period was high. For higher velocities, subjects experienced a sharp decline in torque output at the beginning of the trial, but quickly reached a plateau and had an overall smaller decrease in torque compared with lower velocities. Subjects were able to maintain a more constant torque at higher velocities at the beginning of a trial. These results will be correlated to the EMU data when it has been collected and processed, and a mathematical fatigue model will be built to aid designers and mission planners in evaluating EVA activities.
CitationRamsey, S., Maida, J., and Rajulu, S., "An Investigation of Fatigue During the Flexion and Extension of the Knee as a Function of Velocity," SAE Technical Paper 2001-01-2147, 2001, https://doi.org/10.4271/2001-01-2147.
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