Document Detail

Quantitative assessment and training of isometric cervical extension strength.
MedLine Citation:
PMID:  1781507     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to evaluate the reliability and variability of repeated measurements of isometric cervical extension strength and determine the effect of 10 weeks of dynamic variable resistance cervical extension training on isometric cervical extension strength. Seventy-three subjects (age, 29 +/- 12 years [mean +/- SD]) completed isometric cervical extension strength tests on 4 separate days (D1, D2, D3, and D4). For each test, isometric cervical strength was measured at 126 degrees, 108 degrees, 90 degrees, 72 degrees, 54 degrees, 36 degrees, 18 degrees, and 0 degrees of cervical flexion. Between-day correlation coefficients over the eight angles of cervical flexion were high for D2 versus D3 (r = 0.90 to 0.96). Test variability (standard error of estimate) between D2 versus D3 was low (7.4% to 10.2% of mean) through the entire range of motion. Regression analysis showed that the isometric cervical extension strength curve is linear and descending from flexion to extension. In a second study, 14 subjects (age, 25 +/- 3 years) trained the cervical extensor muscles for 10 weeks while 10 subjects (age, 23 +/- 3 years) served as controls. Training included 8 to 12 cervical extensions to volitional fatigue, 1 day per week. The training group improved isometric cervical extension strength at six of eight angles before to after training (P less than or equal to 0.05). During the same time period the control group did not change. These data indicate that repeated measures of isometric cervical extension strength are highly reliable and can be used for the quantification of isometric cervical extension strength through a 126 degrees range of motion.(ABSTRACT TRUNCATED AT 250 WORDS)
S H Leggett; J E Graves; M L Pollock; M Shank; D M Carpenter; B Holmes; M Fulton
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of sports medicine     Volume:  19     ISSN:  0363-5465     ISO Abbreviation:  Am J Sports Med     Publication Date:    1991 Nov-Dec
Date Detail:
Created Date:  1992-03-09     Completed Date:  1992-03-09     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7609541     Medline TA:  Am J Sports Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  653-9     Citation Subset:  IM    
Department of Medicine, University of Florida, Gainesville 32610.
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MeSH Terms
Evaluation Studies as Topic
Exercise / physiology*
Isometric Contraction
Middle Aged
Neck Muscles / physiology*
Range of Motion, Articular / physiology*
Regression Analysis
Reproducibility of Results

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

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