Meridian-like character of reflex electromyogram activity in longissimus dorsi muscles
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We studied the temporal and spacial character of the electromyogram (EMG) evoked by acupuncture in longissimus dorsi (LD) muscles of rat, and evaluated the effect of needling direction or local blockade on EMG propagation. When certain sites on LD muscle were acupunctured, asynchronous EMG could be activated not only at the acupunctured point, but also within the muscle region supplied by the adjacent 2–3 vertebral segments. The EMG evoked by stimulation on the borderline of aponeurosis and muscle venter was larger in amplitude than those on the other sites in the same vertebral segment. When the distance from the recorded site to stimulated site increased, the EMG amplitude decreased, and its latency prolonged. Acupuncture in an oblique direction toward rostral or caudal side of the muscle enhanced the EMG amplitude in the same direction. EMG activity was weakened and its propagation was blocked by local injection of procaine. These results indicated that the character of EMG propagation evoked by acupuncture was related to the mechanism of needle-feeling propagation along the meridian.
Keywordslongissimus dorsi muscle reflex electromyogram activity acupuncture needle-feeling propagation
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- 1.Lin, V. Z., Observation of the sensory receptors and afferent pathway of meridian points in human body, in Study of Acupuncture and Acupuncture Anesthesia (ed. Zhang, X. T.), Beijing: Science Press, 1986, 323.Google Scholar
- 2.Xie, Y. K., Li, H. Q., Xiao, W. H., Neurobiological mechanisms of the meridian and the propagation of needle feeling along the meridian pathway, Science in China, Ser. C., 1996, 39: 99.Google Scholar
- 3.Zheng, Z., Yu, M., Xie, Y. K., Relationship between the partitioning properties of motoneuron recruitment and the needle feeling propagation, Chinese Science Bulletin, 1998, 43: 285.Google Scholar
- 5.Vanden, N. S., Hamm, T. M., Stuart, D. G., Partitioning of monosynaptic Ia excitatory postsynaptic potential in the motor nucleus of the cat lateral gastrocnemius muscle, J. Neurophysiol., 1986, 55: 569.Google Scholar
- 7.Luscher, H. R., Ciamann, H. P., Relation between structure and function in information transfer in spinal monosynaptic reflex, Physiol. Rev., 1992, 72: 71.Google Scholar
- 8.Clamann, H. P., Henneman, E., Luscher, H. R. et al., Structural and topographical influences on functional connectivity in spinal monosynaptic reflex arcs in the cat, J. Physiol. Lond., 1985, 358: 483.Google Scholar
- 9.Loeb, G. E., Motoneurone task groups: coping with kinematic heterogeneity, J. Exp. Biol., 1985, 115: 137.Google Scholar
- 10.Zhou, H. H., Xie, Y. K., Excitatory connections between spinal motoneurons in the adult rat, Chin. Med. Sci. J., 2000, 15: 35.Google Scholar