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《Chinese Journal of Rehabilitation Medicine》 2003-06
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A study on the function of lumber paraspinal muscle and glutenu maximus in patients with acute low back pain

YU Hongjun,WU Zongyao,LIU Hongliang The Southwest Hospital of the Third Military College,Chongqing,400038  
Objective:To study the function of lumber paraspinal muscle and glutenu maximus by surface electromyography in the healthy subject with and without acute low back pain.Method:7healthy subjects without history of low back pain are recruited.All subjects performed a set of movement on Cybex-330:①Isometric contraction at different position(flexion15,30,45,60,90)with different effort(50%,75%and100%of maximal voluntary contraction).Every movement last30followed by60rest.②After24hour,low back pain(LBP)was induced by1ml subcutaneous injection of distilled water to the L4/L5interspinous space5min prior to the measurement.Then the movements were repeated as what were did the day before.Torque was measured with Cybex330.Surface EMG were taken with the electrode placed over glutenu maximus and the paraspinal muscles at L3/L4and L5/S1level.Result:①The MVC(maximal voluntary contraction)is lower and the VAS is higher in low back pain than those of normal.②In isometric movement,the MPF of LBP is higher than those without LBP.The RMS is lower in LBP than those without LBP.The RMS decreased only on L5/S1and glutenu maximus.Conclusion:①To subcutaneously inject1ml distilled water to interspinous is available for setting up the acute low back pain model.②In the early period of muscle contraction,the MPF of LBP is higher than that of normal and the RMS is lower.It may be the result that acute pain recruited fiber I more.
【CateGory Index】: R49
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