Abstract
Objective
To investigate the applicability and reliability of isokinetic strength measurements
during concentric and eccentric actions of the shoulder muscles in fibromyalgia (FM)
patients.
Design
Test-retest reliability study.
Setting
University laboratory.
Participants
Women with FM (N=25) aged 37 to 69.
Interventions
Not applicable.
Main Outcome Measures
Two isokinetic tests of the shoulder were repeated after an interval of 7 days. Each
test involved 3 repetitions of abduction and adduction performed at a rate of 60°/s.
The first test involved 2 concentric muscle actions (concentric/concentric test).
The second test involved concentric abduction followed by eccentric adduction (concentric/eccentric
test). Unilateral peak torque (Nm) and average work (J) were measured. Applicability
was calculated as the proportion of participants who were able to complete every test.
Reliability was analyzed by intraclass coefficient (ICC), standard error of measurement,
and smallest real difference (SRD).
Results
Applicability was 84% for the concentric/concentric test and 52% for the concentric/eccentric
test. The main factor influencing applicability was age. In the concentric/eccentric
test, measurement of peak torque showed high reliability for the abduction (ICC=.88;
standard error of measurement=1.82; SRD=5.05) and adduction (ICC=.89; standard error
of measurement=3.83; SRD=10.62) phases. In the concentric/concentric test, measurement
of peak torque showed low reliability in the abduction phase (ICC=.29; standard error
of measurement=6.45; SRD=17.87) and excellent reliability in the adduction phase (ICC=.92;
standard error of measurement=5.95; SRD=16.50).
Conclusions
The applicability of shoulder isokinetic tests in FM patients who are women may be
affected by age. In comparison, the concentric/concentric test was more applicable
and less reliable than the concentric/eccentric test during abduction and adduction.
These findings will facilitate the clinical interpretation of changes in isometric
and isokinetic shoulder adduction and abduction tests in women with FM.
Keywords
List of abbreviations:
FM (fibromyalgia), FIQ (Fibromyalgia Impact Questionnaire), ICC (intraclass correlation coefficient), ROM (range of motion), SRD (smallest real difference)To read this article in full you will need to make a payment
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Article info
Publication history
Published online: August 20, 2012
Footnotes
Supported by a predoctoral fellowship by the Spanish Ministry of Education (FPU3839); and the Government of Extremadura and European Union Regional Development Fund (ERDF-FEDER) funds (GRI0127).
No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit on the authors or on any organization with which the authors are associated.
Identification
Copyright
© 2013 American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved.
