Independent activation in adjacent lumbar extensor muscle compartments

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
Marilee M NugentTheodore E Milner

Abstract

The purpose of this study was to examine compartmentalization in human lumbar spine extensors. Structure and innervation of these muscles would suggest the possibility of more segmentally specific biomechanical functions than have been found in previous studies examining muscle activation patterns during simple spine bending and twisting tasks. We selected specialized tasks to more effectively investigate the degree of independent control possible within lumbar spine extensors. We recorded surface electromyograms (SEMG) from the right posterior lumbar region during performance of two segmentally specific bellydance skills by seven novice and five trained subjects. These movements were performed at two frequencies (0.5 and 1Hz). Cross-correlations were performed between pairs of rectified, low-pass filtered (6Hz) SEMG signals to determine temporal lags between rhythmic bursts. Results showed a difference in the timing of muscle activation above and below the third lumbar vertebra. Temporal asynchrony was independent of either skill level or tempo, suggesting a hard-wired capacity for independent control of adjacent muscle compartments. The results have implications for understanding trunk control in the context of postural stabi...Continue Reading

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Citations

Nov 20, 2016·Journal of Back and Musculoskeletal Rehabilitation·Tabitha CastrillonMichael Masaracchio
Dec 30, 2016·Journal of Neurophysiology·Marilee M Nugent, Theodore E Milner

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