Reliability and validity of isometric knee extensor strength test with hand-held dynamometer depending on its fixation: A pilot studyopen access
- Authors
- Kim, W.K.; Kim, D.-K.; Seo, K.M.; Kang, S.H.
- Issue Date
- Feb-2014
- Publisher
- Korean Academy of Rehabilitation Medicine
- Keywords
- Dimensional measurement accuracy; Isometric contraction; Knee joint; Muscle strength dynamometer; Physical restraint
- Citation
- Annals of Rehabilitation Medicine, v.38, no.1, pp 84 - 93
- Pages
- 10
- Journal Title
- Annals of Rehabilitation Medicine
- Volume
- 38
- Number
- 1
- Start Page
- 84
- End Page
- 93
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/13877
- DOI
- 10.5535/arm.2014.38.1.84
- ISSN
- 2234-0645
2234-0653
- Abstract
- Objective: To determine the reliability and validity of hand-held dynamometer (HHD) depending on its fixation in measuring isometric knee extensor strength by comparing the results with an isokinetic dynamometer. Methods: Twenty-seven healthy female volunteers participated in this study. The subjects were tested in seated and supine position using three measurement methods: isometric knee extension by isokinetic dynamometer, non-fixed HHD, and fixed HHD. During the measurement, the knee joints of subjects were fixed at a 35° angle from the extended position. The fixed HHD measurement was conducted with the HHD fixed to distal tibia with a Velcro strap; non-fixed HHD was performed with a hand-held method without Velcro fixation. All the measurements were repeated three times and among them, the maximum values of peak torque were used for the analysis. Results: The data from the fixed HHD method showed higher validity than the non-fixed method compared with the results of the isokinetic dynamometer. Pearson correlation coefficients (r) between fixed HHD and isokinetic dynamometer method were statistically significant (supine-right: r=0.806, p<0.05; seating-right: r=0.473, p<0.05; supine-left: r=0.524, p<0.05), whereas Pearson correlation coefficients between non-fixed dynamometer and isokinetic dynamometer methods were not statistically significant, except for the result of the supine position of the left leg (r=0.384, p<0.05). Both fixed and non-fixed HHD methods showed excellent inter-rater reliability. However, the fixed HHD method showed a higher reliability than the non-fixed HHD method by considering the intraclass correlation coefficient (fixed HHD, 0.952-0.984; non-fixed HHD, 0.940-0.963). Conclusion: Fixation of HHD during measurement in the supine position increases the reliability and validity in measuring the quadriceps strength. © 2014 by Korean Academy of Rehabilitation Medicine.
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