Validity and reliability of evaluating hip abductor strength using different normalization methods in a functional electromechanical device
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PLOS
Date
2018-08-20Referencia bibliográfica
Cerda Vega E, Jerez-Mayorga D, Machado Payer R, Campos Jara C, Guzman- Guzman I, Reyes Ponce A, et al. (2018) Validity and reliability of evaluating hip abductor strength using different normalization methods in a functional electromechanical device. PLoS ONE 13(8): e0202248.
Abstract
The hip abductor muscles are vitally important for pelvis stability, and common strength deficits
can negatively affect functionality. The muscle strength can be measured using different
dynamometers and be evaluated in three positions (side-lying, standing, and supine).
Obtained strength data can be expressed in different ways, with data normalization providing
more objective and comparable results. The aim of this study was to establish the validity
and reliability of three protocols in evaluating the isometric strength of the hip abductor muscles.
A new functional electromechanical dynamometer assessed strength in three positions,
with findings subjected to three data normalization methods. In two identical sessions,
the hip abductor strengths of 29 subjects were recorded in the side-lying, standing, and
supine positions. Peak force was recorded in absolute terms and normalized against body
mass, fat-free mass, and an allometric technique. The peak force recorded in the side-lying
position was 30% and 27% higher than in the standing and supine positions, respectively,
independent of data normalization methodology. High inter-protocol correlations were found
(r: 0.72 to 0.98, p 0.001). The supine position with allometric data normalization had the
highest test-retest reliability (0.94 intraclass correlation coefficient and 5.64% coefficient of
variation). In contrast, the side-lying position with body mass data normalization had a 0.66
intraclass correlation coefficient and 9.8% coefficient of variation. In conclusion, the functional
electromechanical dynamometer is a valid device for measuring isometric strength in
the hip abductor muscles. The three assessed positions are reliable, although the supine
position with allometric data normalization provided the best results.