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Reliability of isometric and isokinetic trunk flexor strength using a functional electromechanical dynamometer.

ABSTRACT: Aim:To determine the absolute and relative reliability of functional trunk tests, using a functional electromechanical dynamometer to evaluate the isokinetic strength of trunk flexors and to determine the most reliable assessment condition, in order to compare the absolute and relative reliability of mean force and peak force of trunk flexors and to determine which isokinetic condition of evaluation is best related to the maximum isometric. Methods:Test-retest of thirty-seven physically active male student volunteers who performed the different protocols, isometric contraction and the combination of three velocities (V1 = 015 m s-1 , V2 = 0.30 m s-1, V3 = 0.45 m s-1) and two range of movement (R1 = 25% cm ; R2 = 50% cm) protocols. Results:All protocols to evaluate trunk flexors showed an absolute reliability provided a stable repeatability for isometric and dynamic protocols with a coefficient of variation (CV) being below 10% and a high or very high relative reliability (0.69 < intraclass correlation coefficient [ICC] > 0.86). The more reliable strength manifestation (CV = 6.82%) to evaluate the concentric contraction of trunk flexors was mean force, with 0.15 m s-1 and short range of movement (V1R1) condition. The most reliable strength manifestation to evaluate the eccentric contraction of trunk flexors was peak force, with 0.15 m s-1 and a large range of movement (V1R2; CV = 5.07%), and the most reliable way to evaluate isometric trunk flexors was by peak force (CV = 7.72%). The mean force of eccentric trunk flexor strength with 0.45 m s-1 and short range of movement (V3R1) condition (r = 0.73) was best related to the maximum isometric contraction. Conclusion:Functional electromechanical dynamometry is a reliable evaluation system for assessment of trunk flexor strength.

SUBMITTER: Rodriguez-Perea A

PROVIDER: S-EPMC6827544 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature

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Reliability of isometric and isokinetic trunk flexor strength using a functional electromechanical dynamometer.

Rodriguez-Perea Angela A Chirosa Ríos Luis J LJ Martinez-Garcia Dario D Ulloa-Díaz David D Guede Rojas Francisco F Jerez-Mayorga Daniel D Chirosa Rios Ignacio J IJ

PeerJ 20191018

<h4>Aim</h4>To determine the absolute and relative reliability of functional trunk tests, using a functional electromechanical dynamometer to evaluate the isokinetic strength of trunk flexors and to determine the most reliable assessment condition, in order to compare the absolute and relative reliability of mean force and peak force of trunk flexors and to determine which isokinetic condition of evaluation is best related to the maximum isometric.<h4>Methods</h4>Test-retest of thirty-seven phys ...[more]

PMID: 31695965

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Project description:BACKGROUND:Muscle strength measurements using hand-held dynamometry (HHD) can be affected by the inadequate strength of the tester and lack of stabilization of the participants and the device. A portable HHD anchoring system was designed that enabled the measurement of isometric knee extensor muscle strength in a supine position. This can be used with individuals who are unable to assume the sitting position required for the measurement of knee extensor strength in conventional isokinetic dynamometry (IKD). The aim of this study was to evaluate the reliability and validity of knee extensor strength measurements using this device. METHODS:The maximal knee extensor isometric strength of the dominant leg in healthy adults aged 20 to 40?years was tested. Three trials of three contractions were assessed by two raters using the portable dynamometer anchoring system whilst the participant was in the supine position. After the three measurement trials, peak knee extensor torque was evaluated using IKD. The intraclass correlation coefficient (ICC) and 95% limits of agreement (LOA) for intra- and inter-rater reliability were obtained. RESULTS:Thirty-nine participants (19 male and 20 female, aged 30.08?±?4.16 y), completed the three measurement trials. The ICC for intra-rater reliability was 0.98 for the maximum measurements of knee extensor strength (95% confidence interval [CI]: 0.96-0.98) and 0.98 (95% CI: 0.96-0.99) for inter-rater reliability. The mean difference (%) between the maximum knee extensor strength measurements of each trial was 1.02% (LOA range: -?11.13 to 13.16%) for intra-rater and?-?1.44% (LOA range: -?13.98 to 11.08%) for inter-rater measurements. The Pearson correlation coefficient of the maximum voluntary peak torque measurements with the portable dynamometer anchoring system and IKD was 0.927. CONCLUSIONS:The portable dynamometer anchoring system is a reliable and valid tool for measuring isometric knee extensor strength in a supine position. Future clinical feasibility studies are needed to determine if this equipment can be applied to people with severe illness or disabilities. TRIAL REGISTRATION:KCT0003041 .

Dataset Information

Reliability of isometric and isokinetic trunk flexor strength using a functional electromechanical dynamometer.

Publications

Reliability of isometric and isokinetic trunk flexor strength using a functional electromechanical dynamometer.

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