NDLI: EMG in rotation-flexion of the torso.

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EMG in rotation-flexion of the torso.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Kumar, Shrawan
Description	Country affiliation: United States Author Affiliation: Kumar S ( Physical Medicine Institute, University of North Texas Health Science Center, 3500 Camp Bowie Boulevard, 431 Center for BioHealth, Fort Worth, Texas 76107, USA. Shrawan.kumar@unthsc.edu)
Abstract	The objective of this study was to determine the magnitude and phasic relationship of the torso muscles in rotation-flexion of varying degree of asymmetries of the trunk. Nineteen normal young subjects (7 males and 12 females) were stabilized on a posture stabilizing platform and instructed to assume a flexed and right rotated posture. A combination 20°, 40° and 60° of rotation and 20°, 40° and 60° of flexion resulted in nine postures. These postures were assumed in a random order. The subjects were asked to exert their maximal voluntary isometric contraction (MVC) in the plane of rotation of the posture assumed for a period of 5s. The surface EMG from the external and internal obliques, rectus abdominis, latissimus dorsi and erector spinae at the 10th thoracic and 3rd lumbar vertebral levels was recorded. The abdominal muscles had the least response at 40° of flexion, the dorsal muscles had the highest magnitude. With increasing right rotation, the left external oblique continued to decrease its activity. The ANOVA revealed that rotation and muscles had a significant main effect on normalized peak EMG (p<0.02) in both genders. There was a significant interaction between rotation and flexion in both genders (p<0.02) and rotation and muscle in females. The erector spinae activity was highest at 40° flexion, due to greater mechanical disadvantage and having not reached the state of flexion-relaxation. The abdominal muscle activity declined with increasing asymmetry, due to the decreasing initial muscle length. The EMG activity was significantly affected by rotation than flexion (p<0.02).
File Format	HTM / HTML
ISSN	10506411
Issue Number	6
Volume Number	20
e-ISSN	18735711
Journal	Journal of Electromyography and Kinesiology
Language	English
Publisher	Elsevier
Publisher Date	2010-12-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Cardiology Electromyography Muscle, Skeletal Physiology Female Humans Male Posture Rotation Spine Torque Young Adult Journal Article
Content Type	Text
Resource Type	Article
Subject	Neuroscience Neurology (clinical) Biophysics Sports Science

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