Research Outputs

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  • Publication
    A new reliable device to assess trunk extensors strength
    (Acta of Bioengineering and Biomechanics, 2021) ; ;
    Reyes-Ferrada, Waleska
    ;
    Chirosa-RĆ­os, Luis
    ;
    Chirosa-RĆ­os, Ignacio
    ;
    MartĆ­nez-GarcĆ­a, DarĆ­o
    ;
    Jerez-Mayorga, Daniel
    ;
    Rodrƭguez-Perea, Ɓngela
    Purpose: This study aimed to examine the reliability of trunk extensor strength assessment with a functional electromechanical dynamometer (FEMD). Methods: Thirty-one men performed strength assessment at different velocities (V) (V1 = 0.15 mĀ·sāˆ’1, V2 = 0.30 mĀ·sāˆ’1, V3 = 0.45 mĀ·sāˆ’1) and range of movement (R) (R1 = 25% cm; R2 = 50% cm), and isometric contraction at 90Āŗ. Reliability was obtained through the intraclass correlation coefficient (ICC), typical error (TE), and coefficient of variation (CV). Results: The absolute reliability provided stable repeatability of the average eccentric strength in the V1R1 condition (CV = 9.52%) and the maximum eccentric strength in V1R1 (CV = 9.63%) and V2R2 (CV = 9.66%). The relative reliability of the trunk extensorā€™s average strength was good (ICC = 0.77ā€“0.83) for concentric and good (ICC = 0.78ā€“0.85) and moderate (ICC = 0.67ā€“0.74) for eccentric contraction. Also, good (ICC = 0.77ā€“0.81) and moderate (ICC = 0.55ā€“0.74) reliability of the maximum strength were obtained for concentric and eccentric contraction. The most reliable manifestation to evaluate the concentric (CV = 11.33%) and eccentric (CV = 9.52%) strength was the average strength in the V1R1 condition and the maximum strength (CV = 10.29%) to isometric assessment. The average concentric strength in the V2R2 condition (r = 0.69) and the maximum eccentric strength in the V1R1 condition (r = 0.65) were the best related to the maximum isometric strength. Conclusions: FEMD is a highly reliable device to evaluate trunk extensors strength.