Effect of viscoelastic properties on passive torque variations at different velocities of the knee joint extension and f
- PDF / 3,971,282 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 83 Downloads / 184 Views
ORIGINAL ARTICLE
Effect of viscoelastic properties on passive torque variations at different velocities of the knee joint extension and flexion movements Mansoor Amiri 1 & Farhad Tabatabai Ghomsheh 2 & Farshad Ghazalian 3 Received: 27 February 2020 / Accepted: 16 August 2020 / Published online: 25 September 2020 # International Federation for Medical and Biological Engineering 2020
Abstract This study aimed to investigate the rate of passive torque variations of human knee joint in the different velocities of knee flexion and extension movements. Ten healthy men were invited to participate in the tests. All passive torque tests were performed for the knee joint extension and flexion on the sagittal plane in three different angular velocities of 15, 45, and 120°/s; in 5 consecutive cycles; and within 0° to 100° range of motion. The electrical activity of knee joint extensor and flexor muscles was recorded until there was no muscle activity signal. A Three-element Solid Model (SLS) was used to obtain the viscose and elastic coefficients. As the velocity increases, the stretch rate in velocity-independent tissues increases, and the stretch rate in velocity-dependent tissues decreases. By increasing the velocity, the resistance of velocity-dependent parts increases, and the velocity-independent parts are not affected by velocity. Since the first torque that resists the joint movement is passive torque, the elastic and viscous torques should be simultaneously used. It is better to perform the movement at a low velocity so that less energy is lost. The viscoelastic resistance of tissues diminishes. Keywords Knee joint . Extension and Flexion movement . Passive viscoelastic torque
1 Introduction Many recent studies show that neuromuscular factors provide and maintain knee joint stability; moreover, the researches have shown that joint injuries and diseases cause changes in joints kinematics [1]. Understanding the biomechanics of a * Farhad Tabatabai Ghomsheh [email protected] Mansoor Amiri [email protected] Farshad Ghazalian [email protected] 1
Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
2
Pediatric Neurorehabilitation Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
3
Department of physical Education sport sciences, science and research Branch, Islamic Azad University, Tehran, Iran
knee joint is in urgent need of designing knee-assistive devices and optimizing a rehabilitation exercise program [1].The joint’s presence due to cartilage, tendons, ligaments, and the shape of joint surface produces the resistance to movement, and all resistance forces produced in the joint are referred to as passive torque [2]. A joint torque is the sum of active and passive torques. (1) Active torque is obtained from active forces. (2) Passive torque is the deformation of passive tissues, which resulted from tendons, ligaments, skin, and inactive parts [3]. The joint’s mechanical properties reflect the combined effec
Data Loading...
