Document Detail

Craniocervical orientation affects muscle activation when exercising the cervical extensors in healthy subjects.
MedLine Citation:
PMID:  20801261     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To evaluate the activity of neck extensor muscles during different extension exercises with muscle functional magnetic resonance imaging (mfMRI). DESIGN: Cross-sectional. SETTING: University laboratory. PARTICIPANTS: Healthy subjects (N=11; 7 men, mean age +/- SD, 34+/-5.6y; 4 women, mean age +/- SD, 23.3+/-5.2y; group mean age +/- SD, 30.1+/-7.5y). INTERVENTION: Not applicable. MAIN OUTCOME MEASURES: mfMRI measures of T2 relaxation were made for the multifidus (Mul), the semispinalis cervicis (SCe), the semispinalis capitis (SCa), and the splenius capitis (SpC) at C2-3, C5-6, and C7-T1 in response to 2 head/neck orientations: craniocervical neutral (CCN) and craniocervical extension (CCE). Subjects performed three 1-minute repetitions of each condition at 20% maximum voluntary contraction. RESULTS: Significant shifts were observed in all muscle groups at the C5-6 and C7-T1 levels after both conditions (P=.04) except the SpC muscle at C5-6 with CCN (P=.17). T2 shifts in the SCa were significantly greater in response to CCE than CCN at C2-3 (P=.03) and C5-6 (P=.02). Similarly, CCE resulted in larger shifts than CCN in the Mul/SCe at C7-T1 (P=.003). No segmental differences were observed between exercises for SpC (P=.25). CONCLUSIONS: The results of this study provide some preliminary insight into the impact of craniocervical orientation on the differential response of the deep and superficial cervical extensor muscles during the performance of cervical extensor exercises.
James M Elliott; Shaun P O'Leary; Barbara Cagnie; Gail Durbridge; Lieven Danneels; Gwendolen Jull
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Archives of physical medicine and rehabilitation     Volume:  91     ISSN:  1532-821X     ISO Abbreviation:  Arch Phys Med Rehabil     Publication Date:  2010 Sep 
Date Detail:
Created Date:  2010-08-30     Completed Date:  2010-09-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985158R     Medline TA:  Arch Phys Med Rehabil     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1418-22     Citation Subset:  AIM; IM    
Division of Physiotherapy, The University of Queensland, Brisbane, Australia.
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MeSH Terms
Cross-Sectional Studies
Exercise / physiology*
Headache / rehabilitation*
Isometric Contraction / physiology
Magnetic Resonance Imaging
Neck Muscles / physiology*
Neck Pain / rehabilitation*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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