Back and hip extensor fatigability in chronic low back pain patients and controls

Archives of Physical Medicine and Rehabilitation
M KankaanpääO Airaksinen

Abstract

To compare the lumbar paraspinal and gluteus maximus muscle fatigability between chronic low back pain patients and healthy controls by using electromyographic (EMG) spectral analysis during a maximal isometric endurance task. A cross-sectional comparative study between chronic low back pain patients and healthy control subjects. Physical medicine and rehabilitation clinic in Finland. Twenty women with nonspecific chronic low back pain (longer than 3 months) and 15 healthy controls. Subjects performed maximal voluntary isometric back extensions (MVC) at 30 degrees forward flexion in a specially designed measurement unit. A 50% MVC load was used in isometric endurance test. Low back pain intensity was assessed by using the visual analogue scale and functional disability by the Oswestry disability index. Time to endurance was measured. Bipolar surface EMG recordings were made over the lumbar paraspinal muscles (L3-L4, L5-S1) and over the gluteus maximus muscles. Average EMG (aEMG%), and initial spectral median frequency (MFinit) and change over time (MFslope) were computed. Pain intensity and functional disability were higher and MVC and time to endurance were lower in the chronic low back pain group (p < .05). Similar muscle act...Continue Reading

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