The reliability of isometric strength and fatigue measures in patients with knee osteoarthritis.

The reliability of isometric strength and fatigue measures in patients with knee osteoarthritis. Research Abstract Details 

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The reliability of isometric strength and fatigue measures in patients with knee osteoarthritis. Abstract Text:

Patients with knee osteoarthritis have both poor strength and endurance of their quadriceps muscles. It is possible to assess muscle fatigue by monitoring frequency spectrum using electromyography (EMG). This study used the closed kinetic chain approach to muscle assessment. Fifty-five subjects with knee osteoarthritis were examined twice within 1 week. To test maximum voluntary isometric contraction into extension an isokinetic dynamometer, with a closed kinetic chain "leg press" attachment was used. EMG assessment of signal median frequency was done by measuring median frequency shift associated with fatiguing of muscle during a 60s isometric contraction at 60% of maximum isometric contraction. Intra-class correlation coefficients with 95% confidence intervals, standard errors of measurement and smallest detectable differences were calculated. Results showed the reliability of the maximum voluntary isometric contraction extension strength test was ICC 0.99 and SEM 3.95Nm. The initial median frequency indices also demonstrated excellent ICC and SEM statistics (ICC 0.84-0.91, SEM 9.2-11Hz) for the three heads of the quadriceps; however, the fatigue slopes for all three muscles were unreliable with poor ICCs (0.04-0.72) and SDD values (2207-4000%). The assessment of peak muscle torque using a closed kinetic chain isometric technique is reliable, as is the determination of median frequency values for the quadriceps. Error for the assessment of fatigue was of an unacceptable scale. While the use of a closed kinetic chain leg press technique provides a reliable measurement of lower limb strength, EMG power spectrum decrease during an isometric contraction is of little value.

The reliability of isometric strength and fatigue measures in patients with knee osteoarthritis. Publishing Authors By Initials

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The reliability of isometric strength and fatigue measures in patients with knee osteoarthritis. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Manual therapy

VOLUME: 13

Page Numbers: 159-64

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ISSN: 1532-2769

DAY: 12

MONTH: 02

YEAR: 2007

The reliability of isometric strength and fatigue measures in patients with knee osteoarthritis. Information

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LANGUAGE: eng

NlmUniqueID: 9610924

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Grant and Affiliation Information for The reliability of isometric strength and fatigue measures in patients with knee osteoarthritis.

AFFILIATION: Medical School Building, The University of Warwick, Gibbet Hill Campus, Coventry CV4 7AL, UK. C.J.McCarthy@warwick.ac.uk

Country: Scotland

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MEDLINETA: Man Ther

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