EFFECTS OF ANGULAR VELOCITY ALTERATION ON THE MOTOR VARIABILITY OF KNEE EXTERNSOR MUSCLE SYNERGIES DURING ISOKINETIC MOVEMENTS

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KHALEGHI F.; OLYAEI GH.R.; TALEBIAN MOGHADDAM S.; MALMIR K.; BAGHERI H.; NAKHOSTIN ANSARI N.; JALAEE SH.

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Journal: Journal of Modern Rehabilitation Year:2016 | Volume:10 | Issue:1 Page(s): 88-93

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Title

EFFECTS OF ANGULAR VELOCITY ALTERATION ON THE MOTOR VARIABILITY OF KNEE EXTERNSOR MUSCLE SYNERGIES DURING ISOKINETIC MOVEMENTS

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Keywords

VARIABILITYQ1

ANGULAR VELOCITYQ1

MUSCLE SYNERGIEQ1

EXTERNSOR MUSCLEQ1

Abstract

Background and Aim: Several studies have investigated the effects of ANGULAR VELOCITY on mechanical and physiological variables such as joint net torque, muscle force and myoelectrical activity, but so far its effects on the control of the pattern of synergist muscle activation during isokinetic movements have not been studied. In this experiment, a computational method of identifying and analyzing MUSCLE SYNERGIEs were used which is based on the framework of the uncontrolled manifold hypothesis to determine the VARIABILITY of MUSCLE SYNERGIEs following movement velocity alteration.Materials and Methods: Twelve healthy females without any known neurological or motor disorders participated in the experiment. The participants were positioned on a Biodex dynamometer. They were asked to perform ten continuous knee extension and flexion motions with maximal strength at 45°/s or 300°/s.Electromyographic activity of the vastus medialis (VM), vastus lateralis (VL) and rectus femoris (RF) were recorded and variance within the UCM (VUCM) and orthogonal to the UCM (VORT) with respect to an appropriate Jacobian matrix was computed. An independent t-test was used to compare VUCM between two velocities.Results: Across subjects, VUCM was significantly higher than VORT (VUCM>VORT) in both tasks. There was no significant difference in VUCM between two velocities (p>0.05).Conclusion: Our findings suggest that ANGULAR VELOCITY is not an important parameter when a controller of a multi-element system wants to stabilize a particular value of a performance variable.

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APA: Copy

KHALEGHI, F., OLYAEI, GH.R., TALEBIAN MOGHADDAM, S., MALMIR, K., BAGHERI, H., NAKHOSTIN ANSARI, N., & JALAEE, SH.. (2016). EFFECTS OF ANGULAR VELOCITY ALTERATION ON THE MOTOR VARIABILITY OF KNEE EXTERNSOR MUSCLE SYNERGIES DURING ISOKINETIC MOVEMENTS. JOURNAL OF MODERN REHABILITATION, 10(1 ), 88-93. SID. https://sid.ir/paper/187214/en

Vancouver: Copy

KHALEGHI F., OLYAEI GH.R., TALEBIAN MOGHADDAM S., MALMIR K., BAGHERI H., NAKHOSTIN ANSARI N., JALAEE SH.. EFFECTS OF ANGULAR VELOCITY ALTERATION ON THE MOTOR VARIABILITY OF KNEE EXTERNSOR MUSCLE SYNERGIES DURING ISOKINETIC MOVEMENTS. JOURNAL OF MODERN REHABILITATION[Internet]. 2016;10(1 ):88-93. Available from: https://sid.ir/paper/187214/en

IEEE: Copy

F. KHALEGHI, GH.R. OLYAEI, S. TALEBIAN MOGHADDAM, K. MALMIR, H. BAGHERI, N. NAKHOSTIN ANSARI, and SH. JALAEE, “EFFECTS OF ANGULAR VELOCITY ALTERATION ON THE MOTOR VARIABILITY OF KNEE EXTERNSOR MUSCLE SYNERGIES DURING ISOKINETIC MOVEMENTS,” JOURNAL OF MODERN REHABILITATION, vol. 10, no. 1 , pp. 88–93, 2016, [Online]. Available: https://sid.ir/paper/187214/en

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