Contraction of the abdominal muscles associated with movement of the lower limb

Hodges, P. W. and Richardson, C. A. (1997) Contraction of the abdominal muscles associated with movement of the lower limb. Physical Therapy, 77 2: 132-142.

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Author Hodges, P. W.
Richardson, C. A.
Title Contraction of the abdominal muscles associated with movement of the lower limb
Journal name Physical Therapy   Check publisher's open access policy
ISSN 1538-6724
Publication date 1997
Sub-type Article (original research)
Open Access Status File (Publisher version)
Volume 77
Issue 2
Start page 132
End page 142
Total pages 11
Place of publication New York
Publisher American Physical Therapy Association
Language eng
Subject 11 Medical and Health Sciences
Abstract Background and Purpose. Activity of the trunk muscles is essential for maintaining stability of the lumbar spine because of the unstable structure of that portion of the spine. A model involving evaluation of the response of the lumbar multifidus and abdominal muscles to leg movement was developed to evaluate this function. Subjects. To examine this function in healthy persons, 9 male and 6 female subjects (mean age = 20.6 years, SD = 2.3) with no history of low back pain were studied. Methods. Fine-wire and surface electromyography electrodes were used to record the activity of selected trunk muscles and the prime movers for hip flexion, abduction, and extension during hip movements in each of these directions. Results. Trunk muscle activity occurring prior to activity of the prime mover of the limb was associated with hip movement in each direction. The transversus abdominis (TrA) muscle was invariably the first muscle that was active. Although reaction time for the TrA and oblique abdominal muscles was consistent across movement directions, reaction time for the rectus abdominis and multifidus muscles varied with the direction of limb movement. Conclusion and Discussion. Results suggest that the central nervous st stem deals with stabilization of the spine by contraction of the abdominal and multifidus muscles in anticipation of reactive forces produced by limb movement. The TrA and oblique abdominal muscles appear to contribute to a function not related to the direction of these forces.
Keyword Orthopedics
Abdominal Muscles
Feedforward Postural Reactions
Limb Movement
Motor Control
Spinal Stability
Anticipatory Postural Adjustments
Voluntary Arm Movements
Leg Muscles
Intraabdominal Pressure
Standing Man
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Health and Rehabilitation Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 242 times in Thomson Reuters Web of Science Article | Citations
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Created: Mon, 13 Aug 2007, 16:40:12 EST