EVALUATION OF THE EFFECT OF FATIGUING ISOINERTIAL MOVEMENTS ON THE MOTOR OUTPUT AND MOVEMENT PATTERNS IN 38 YOUNG FEMALES

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ALIAEI GHOLAM REZA; AKBARI M.; BAGHERI H.; HADIYAN M.R.; TALEBIAN S.; AHMADVAND N.

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Journal: Tehran University Medical Journal Year:2000 | Volume:58 | Issue:1 Page(s): 71-81

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Title

EVALUATION OF THE EFFECT OF FATIGUING ISOINERTIAL MOVEMENTS ON THE MOTOR OUTPUT AND MOVEMENT PATTERNS IN 38 YOUNG FEMALES

Author(s)

Keywords

ISOINERTIAL MOVEMENTSQ4

FATIGUEQ2

MOTOR OUTPUTQ4

MUSCLESQ2

Abstract

It is generally assumed that local muscular FATIGUE predisposes the individual to injury. Despite the significance of muscular FATIGUE and endurance, there are not much dynamic endurance studies for trunk MUSCLES in the literature. Most of them have used isokinetic dynamometer which keeps the velocity of movement constant. In this studies with the help of an isoinertial dynamometer we have assessed the effect of repetitive and fatiguing flexion-extension movements patterns and MOTOR OUTPUT.Thirty eight female subjects with no history of low-back pain for the 6 months volunteered for the study. A triaxial dynamometer was used that simultaneously provided measurement of torque, angular position, velocity, impulse, work and power of each axis. Resistances were set independently for each axis by an interfaced computer. The subjects performed trunk flexion and extension movement against a saggital plane resistance equal to 50% of their maximum isometric extension strength in the upright position. The minimum resistance in the coronal and transverse planes were set-up at 5-7 Newton meters. The subjects were asked to perform trunk movement as quickly and as accurately as possible while exerting the maximum efforts until exhaustion. Immediately after dynamic test another isometric test was performed.A paired t-test procedure was performed among the selected parameters of the first middle and last three repetition cycles. The selected parameters are rang of motion, velocity, torque, impulse, work, power, time interval and time of movement. Also, a paired t-test was performed between maximum isometric strength before and after dynamic test. All the selected parameters were significantly reduced in the saggital plane. Subjects displayed significantly less motor control and greater range of motion in the coronal and transverse planes in performing the primary task of flexion and extension.The reduction of the functional capacity of the primary MUSCLES performing the required task is compensated by secondary muscle groups and the spinal structures is located in a more injury prone position, as identified by finite element models.In addition it is suggested that the FATIGUEd MUSCLES would be less able to compersate any perturbation in the load or position of the trunk. The repetitive loading results in a weakening of the viscoelastic passive elements of the spineless structure. The loss of ability to protect these weakened passive elements makes the spine susceptible to industrial and recreational injuries.

Cites

THE EFFECTS OF DIFFERENT ANGLES OF LUMBO- SACRAL ON ISOMETRIC AND DYNAMIC TORQUES OF TRUNK MUSCLES IN HEALTHY SUBJECTS

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APA: Copy

ALIAEI, GHOLAM REZA, AKBARI, M., BAGHERI, H., HADIYAN, M.R., TALEBIAN, S., & AHMADVAND, N.. (2000). EVALUATION OF THE EFFECT OF FATIGUING ISOINERTIAL MOVEMENTS ON THE MOTOR OUTPUT AND MOVEMENT PATTERNS IN 38 YOUNG FEMALES. TEHRAN UNIVERSITY MEDICAL JOURNAL (TUMJ), 58(1), 71-81. SID. https://sid.ir/paper/38123/en

Vancouver: Copy

ALIAEI GHOLAM REZA, AKBARI M., BAGHERI H., HADIYAN M.R., TALEBIAN S., AHMADVAND N.. EVALUATION OF THE EFFECT OF FATIGUING ISOINERTIAL MOVEMENTS ON THE MOTOR OUTPUT AND MOVEMENT PATTERNS IN 38 YOUNG FEMALES. TEHRAN UNIVERSITY MEDICAL JOURNAL (TUMJ)[Internet]. 2000;58(1):71-81. Available from: https://sid.ir/paper/38123/en

IEEE: Copy

GHOLAM REZA ALIAEI, M. AKBARI, H. BAGHERI, M.R. HADIYAN, S. TALEBIAN, and N. AHMADVAND, “EVALUATION OF THE EFFECT OF FATIGUING ISOINERTIAL MOVEMENTS ON THE MOTOR OUTPUT AND MOVEMENT PATTERNS IN 38 YOUNG FEMALES,” TEHRAN UNIVERSITY MEDICAL JOURNAL (TUMJ), vol. 58, no. 1, pp. 71–81, 2000, [Online]. Available: https://sid.ir/paper/38123/en

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