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BACKGROUND AND PURPOSE The purpose of this study was to assess the effects of an endurance exercise protocol on the isometric holding time of the trunk extensor muscles (mechanical fatigue measure) and on the recorded median frequency (MF) measurements from the surface electromyogram (physiological fatigue measure). SUBJECTS Twenty-eight healthy female(More)
STUDY DESIGN The authors performed an empirical prospective study of 115 patients referred to physical therapy for low back pain and 112 control subjects of similar age and gender. OBJECTIVES The authors defined and compared subgroups based on physical tests and described demographic and psychosocial characteristics by group. SUMMARY OF BACKGROUND DATA(More)
This paper is adapted in part from a thesis written for the degree of Master of Arts from New York University, New York, and was supported in part by research grant RT-1 (c6) from the Social and Rehabilitation Services, Department of Health, Education, Welfare, Washington, DC under the designation of New York University as a Rehabilitation and Training(More)
The authors define five different measurements of power of muscular performance. Using an isokinetic dynamometer, the velocity of motion is constant and thus can be controlled. Power, therefore, can be readily assessed. The speed of muscular contraction is of physiological and functional interest. The time it takes for muscles to develop force, the rate at(More)
Trunk muscles are designed to fulfill their role of continuous activity throughout the day, but pain and inactivity alter muscles so that they fatigue in normal situations. Lack of endurance of the trunk muscles is an important factor in low back pain (LBP). This paper examines some methods to objectively test endurance of trunk flexor and extensor muscles(More)
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