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Effect of Intermittent, Supine Cervical Traction on the Myoelectric Activity of the Upper Trapezius Muscle in Subjects with Neck Pain

Ms. Jette is Assistant Professor of Physical Therapy, Simmons College, 300 The Fenway, Boston, MA 02115 (USA).
Dr. Falkel was Assistant Professor of Physical Therapy, Sargent College of Allied Health Professions, Boston University, University Rd, Boston, MA, when this study was done. He is now Assistant Professor of Physical Therapy, Department of Health and Human Services, Convocation Center, Ohio University, Athens, OH 45701.
Ms. Trombly is Associate Professor of Occupational Therapy, Sargent College of Allied Health Professions, Boston University, University Rd, Boston, MA 02215.

This study was undertaken to compare the myoelectric activity of the upper trapezius muscle before, during, and after intermittent, supine cervical traction. Twelve people with diagnosed disease or injury of the cervical spine served as subjects. Electromyographic recordings were taken from the upper trapezius muscle with bipolar surface electrodes. The subjects were treated with 20 minutes of intermittent, cervical traction at a force of 8% of their body weight. Recordings were taken with the subjects in the supine position before the traction, during one pull and release phase of the 10th and 20th minutes of traction, and after completion of the traction treatment. An analysis of variance with repeated measures showed no significant differences in the myoelectrical activity during the six time periods measured. The results of this study do not support the clinical use of intermittent, supine traction to produce cervical muscle relaxation.

Key Words: Muscle • Neck • Physical therapy • Traction

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