FATIGUE OF THE ERECTOR SPINAE MUSCLES - A QUANTITATIVE ASSESSMENT USING FREQUENCY BANDING OF THE SURFACE ELECTROMYOGRAPHY SIGNAL

被引:91
作者
DOLAN, P
MANNION, AF
ADAMS, MA
机构
[1] Comparative Orthopaedic Research Unit, University of Bristol, Bristol
关键词
Emg; Erector spinae; Fatigue; Power spectrum;
D O I
10.1097/00007632-199501150-00005
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
Study Design. The authors investigated fatigue-induced changes in the frequency content of the surface electromyographic (EMG) signal from the erector spinae muscles. Objectives. The objective of the study was to understand the EMG changes in fatiguing muscle and to obtain a reliable index of fatigue. Summary of Background Data. Power spectral analysis has been used increasingly in recent years to monitor muscle fatigue, but parameters other than the mean or median frequency have received little attention. Methods. Thirty-five healthy volunteers participated. They pulled upward with constant force on a handlebar attached to a floor-mounted load cell while the EMG signal from the erector spinae was recorded at the levers of T10 and L3 at 1024 Hz; 1.0-sec ''windows'' of the signal were analyzed using fast Fourier transforms, and the resulting power spectra were divided into 10-frequency bands between 5 Hz and 300 Hz. The median frequency, total power, and peak amplitude-of the spectra were also calculated. Changes in the frequency content of the EMG signal were examined during submaximal contractions of different intensity and duration. Results. Median frequency decreased steadily during the contractions, whereas total power and peak amplitude increased. The most-repeatable and linear index of change was the increase in the EMG signal in the 5-30 Hz frequency band. The middle-to-high frequency component of the EMG signal increased during the early stages of the contractions, but decreased as the endurance limit was approached. Conclusions. Changes in the 5-30 Hz band of the EMG power spectrum provide a more reliable and linear index of fatigue in the erector spinae muscles than do changes in median frequency. In the erector spinae, the early effects of fatigue appear to be delayed by the recruitment of additional motor units.
引用
收藏
页码:149 / 159
页数:11
相关论文
共 44 条
[1]  
Adams M.A., Dolan P., A technique for quantifying bending moment acting on the lumbar spine in-vivo, J Biomech, 24, pp. 117-126, (1991)
[2]  
Adams M.A., Hutton W.C., Has the lumbar spine a margin of safety in forward bending?, Clin Biomech, 1, pp. 3-6, (1986)
[3]  
Andersson G., Herberts P., Ortengren R., Myoelectric back muscle activity in standardized lifting postures, International Series on Biomechanics Volume, 1A, pp. 520-529, (1976)
[4]  
Arendt-Nielsen L., Mills K.R., The relationship between mean power frequency of the EMG spectrum and muscle fibre conduction velocity, Electroencephal Clin Neurophysiol, 60, pp. 130-134, (1985)
[5]  
Bagnall K.M., Ford D.M., McFadden K.D., Greenhill B.J., Raso V.J., The histochemical composition of human vertebral muscle, Spine, 9, pp. 470-473, (1984)
[6]  
Bazzy A.R., Korten J.B., Haddad G.G., Increase in electromyogram low-frequency power in non-fatigued contracting skeletal muscle, J Appl Physiol, 61, pp. 1012-1017, (1986)
[7]  
Biedermann H.J., Shanks G.L., Forrest W.J., Inglis J., Power spectrum analysis of electromyographic activity. Discriminators in the differential assessment of patients with chronic low back pain, Spine, 16, pp. 1179-1184, (1991)
[8]  
Bigland-Ritchie B., Donovan E.F., Roussos C.S., Conduction velocity and EMG power spectrum changes in fatigue of sustained maximal efforts, J Appl Physiol, 51, pp. 1300-1305, (1981)
[9]  
Bilodeau M., Arsenault A.B., Gravel D., Bourbonnais D., The influence of an increase in the level of force on the EMG power spectrum of elbow extensors, Euro J Appl Physiol, 61, pp. 461-466, (1990)
[10]  
Bogduk N., Twomey L.T., Clinical Anatomy of the Lumbar Spine, pp. 83-120, (1991)