Determining the validity and reliability of the Nicholas Manual Muscle Tester as a measure of isometric strength in women with arthritis Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/0g354j91d

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  • The purpose of this investigation was to determine the validity and reliability of the Nicholas Manual Muscle Tester (NMMT), a portable dynamometer, as a measure of the isometric strength in women with arthritis. Female subjects (N=13; 66 ± 13.89 yrs.) with arthritis were tested for isometric muscle strength on the shoulder and hip (abduction, adduction, flexion, extension). Subjects were tested on three separate days using NMMT and Kincom 500-H dynamometers. Each subject performed three maximal isometric contractions for each joint action. A visual analog pain scale was used to determine level of pain prior to testing. Reliability values based on intraclass correlations coefficients (R) ranged from .85 to .93., with the exception of shoulder abduction being .49. Validity was determined correlating the mean value of the NMMT score with corresponding Kincom isometric measure. Pearson product moment correlations ranged from (r) .02 to .86, with 4 of 8 values meeting .05 level of significance. Correlation coefficients for pain and isometric force values were inconclusive and ranged from -.305 to .218. Major conclusions were: a) NMMT had high test-retest reliability in this sample; b) NMMT provides little criterion evidence of validity with the Kincom for most movements of hip and shoulder; c) level of pain was not a significant factor in subject reliability.
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