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• W3126052110 abstract "The purpose of this study was to model the resistance mechanism of Passive Knee Joint Flexion and Extension to create a similar torque mechanism in rehabilitation equipment. In order to better model the behavior of passive knee tissues, it is necessary to exactly calculate the two coefficients of elasticity of time-independent and time-dependent parts. Ten healthy male volunteers (mean height 176.4+/−4.59 cm) participated in this study. Passive knee joint flexion and extension occurred at velocities of 15, 45, and 120 (degree/s), and in five consecutive cycles and within the range of 0 to 100° of knee movement on the sagittal plane on Cybex isokinetic dynamometer. To ensure that the muscles were relaxed, the electrical activity of knee muscles was recorded. The elastic coefficient, (K S ) increased with elevating the passive velocity in flexion and extension. The elastic coefficient, (K P ) was observed to grow with the passive velocity increase. While, the viscous coefficient (C) diminished with passive velocity rise in extension and flexion. The heightened passive velocity of the motion resulted in increased hysteresis (at a rate of 42%). The desired of passive velocity is lower so that there is less energy lost and the viscoelastic resistance of the tissue in the movement decreases. The Coefficient of Determination, R 2 between the model-responses and experimental curves in the extension was 0.96 < R 2 < 0.99 and in flexion was 0.95 < R 2 < 0.99. This modeling is capable of predicting the true performance of the components of passive knee movement and we can create a resistance mechanism in the rehabilitation equipment to perform knee joint movement. Quantitative measurements of two elastic coefficients of Time-independent and Time-dependent parts passive knee joint coefficients should be used for better accurate simulation the behavior of passive tissues in the knee which is not seen in other studies." @default.
• W3126052110 created "2021-02-01" @default.
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• W3126052110 date "2021-01-22" @default.
• W3126052110 modified "2023-09-25" @default.
• W3126052110 title "Modeling the resistance mechanism of passive knee joint flexion and extension for use in rehabilitation equipment" @default.
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• W3126052110 doi "https://doi.org/10.1177/0954411921990133" @default.
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