The Research On The Mechanics Characteristic Of Flexor And Extensor During Trunk Isokinetic Exercise In Patients With Chronic Nonspecific Low Back Pain

Purpose:Chronic nonspecific low back pain exists generally, suffering from chronic disease, quality of life of patients with low back pain is decreased, their labor efficiency is reduced, and these seriously influence their daily life and work. This thesis is written to find out the mechanics characteristic of trunk muscles in the chronic nonspecific low back pain patients compared to the general people, to explore the mechanics indexes of trunk muscles in patients with or without chronic nonspecific low back pain under the condition of isokinetic testing, to provide a theory basis to prevent the waist injury, and to give a clinical diagnosis and guide the rehabilitation training to patients with low back pain。Methods:There are 10 young men with chronic nonspecific low back pain and 10 young men without low back pain volunteered to take part in the study, Respectively as patient group and the normal group, by using CON - TREX trunk muscle strength isokinetic testing and training system made in Switzerland, participants were requested to perform the isokinetic centripetal and centrifugal exercise in different angular velocity. And then compare all of the indexes as PT/BW,F/E,AP,T@0.2 and TPT between two groups, in order to analyze the mechanics characteristic of trunk muscle in chronic nonspecific low back pain patients.Results:(1)During the isokinetic centripetal exercise, PT/BW, AP ,T@0.2 of flexor in patient group did not appear significant difference(P﹥0.05) compared with normal group in different angular velocity. TPT were longer than normal group in 90°/ s and 120°/ s , they were shorter than normal group in 30°/ s and 60°/ s, did not appear significant difference (P﹥0.05)compared with normal group.(2)During the isokinetic centripetal exercise, PT/BW, AP and T@0.2 of extensor in patient group were lower than normal group in different angular velocity, and have significant difference (P﹤0.05)in 30°/ s, 60°/ s and 90°/ s, have very significant difference (P﹤0.01)in 120°/ s. TPT were longer than the normal group in different angular velocity, and have significant difference (P﹤0.05).(3)During the isokinetic centrifugal exercise, PT/BW,AP of flexor and extensor did not appear significant difference(P﹥0.05) compared with normal group in two angular velocity. T@0.2 were lower than normal group in two angular velocity, and have extremely significant difference (P﹤0.01).TPT were longer than normal group in two angular velocity, flexor have significant difference(P﹤0.05) in 45°/ s, and the others have extremely significant difference (P﹤0.01).(4)During the isokinetic centripetal exercise, F/E values of patient group were larger than normal group in different angular velocity, and have significant difference (P﹤0.05). During the isokinetic centrifugal exercise, F/E value of patient group did not appear significant difference (P﹥0.05)compared with normal group in two angular velocity.Conclusions :(1)The patients with chronic nonspecific low back pain have the phenomena that balance and strength of trunk muscle become dropping. And it is more apparent during the centripetal exercise.(2)The work efficiency of trunk muscle of patients with chronic nonspecific low back pain is dropping compared to normal group, and there is a distinct decline in the work efficiency of extensor during the centripetal exercise.(3)The explosive force of flexor and extensor appears to decline in patients with chronic nonspecific low back pain, and the explosive force is more obvious dropping during the centripetal exercise of extensor and the centrifugal exercise of flexor and extensor.