Posture related to myoelectric silence of erectores spinae during trunk flexion

Kippers V. and Parker A.W. (1984) Posture related to myoelectric silence of erectores spinae during trunk flexion. Spine, 9 7: 740-745.

Author Kippers V.
Parker A.W.
Title Posture related to myoelectric silence of erectores spinae during trunk flexion
Journal name Spine   Check publisher's open access policy
ISSN 1528-1159
Publication date 1984
Sub-type Article (original research)
Volume 9
Issue 7
Start page 740
End page 745
Total pages 38
Subject 2728 Clinical Neurology
2732 Orthopedics and Sports Medicine
1314 Physiology
Abstract Electromyographic activity of erectores spinae exhibits points of abrupt change during trunk flexion from the erect position and return extension. This study examined the positions at which the myoelectric activity suddenly disappeared and later reappeared. Forty adults were investigated to define accurately the inclinations of the trunk, pelvis, and vertebral column at these positions. The positions at the commencement and cessation of the period of electrical silence both occurred at two-thirds of maximum trunk flexion (x = 80° ±13° SD). At these positions, all flexion measurements were significantly less than their maxima (P <0.001). Hip flexion at the com¬mencement of electrical silence was slightly above one- half its maximum range, and similar to the position at the recommencement of electrical activity (x = 40° ± 12° SD). The most reproducible measurement (r = 0.88) in both positions was vertebral flexion (89% Max.; x = 48° ±6°SD). Eleven of the male subjects repeated the experimental task holding 10.1 kg in their hands. The effect of this was to produce inhibition and reactivation of erectores spinae at a greater degree of vertebral flexion.
Keyword Electrical silence
Electromyography
Erectores spinae
Lumbar spine
Posture
Reflex inhibition
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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