Validez y fiabilidad de los ratios de fuerza isocinética para la estimación de desequilibrios musculares Validity and reliability of isokinetic strength ratios for estimating muscle imbalances

Ayala, Francisco and Sainz de Baranda, Pilar and De Ste Croix, Mark B and Santonja, Fernando (2012) Validez y fiabilidad de los ratios de fuerza isocinética para la estimación de desequilibrios musculares Validity and reliability of isokinetic strength ratios for estimating muscle imbalances. Apunts. Medicina de l'Esport, 47 (176). pp. 131-142. ISSN 18866581

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Abstract

Several isokinetic strength ratios (bilateral and unilateral) of the knee have been extensively used: (i) to identify possible anterior cruciate ligament (ACL) and hamstring strain injury risk factors; (ii) to monitor the effectiveness of rehabilitation programs; and (iii) to determine if an athlete is able to return safely to training and competition sessions after finishing a specific rehabilitation program. However, the precision of these isokinetic strength ratios to evaluate muscle imbalances has been accepted based on theoretical and empirical knowledge, and less based on the scientific evidence regarding their validity and reliability. The purposes of this literature review were: (1) to analyse and compare the validity and reliability of unilateral and bilateral isokinetic strength ratios of the knee for estimating and monitoring possible muscle imbalances; as well as (2) to report cut-off values to categorize the muscle function as normal or with significantly high injury risk. A total of 13 scientific studies fulfilled all the previously established inclusion and exclusion criteria. After analysing all the studies, it was possible to conclude that: (i) very few studies have analysed the validity and reliability of bilateral and unilateral (conventional and functional) isokinetic strength ratios of the knee to identify muscle imbalances; (ii) a bilateral imbalance lower than 10-15% and unilateral imbalances lower than 20-40% could be an appropriate cut-off score to reduce the likelihood of developing hamstring strains and ACL injuries; (iii) the isokinetic strength ratios of the knee appear to present moderate absolute reliability scores (standard error of the measurement <15%); and (iv) more studies are needed to determine the validity and reliability of the isokinetic strength ratios of the knee in different sport modalities.

Item Type: Article
Article Type: Article
Additional Information: Original text in Spanish
Uncontrolled Keywords: Reproducibility; Strength ratios; Injury; Rehabilitation; Hamstring; Quadricep
Subjects: G Geography. Anthropology. Recreation > GV Recreation Leisure
Divisions: Schools and Research Institutes > School of Sport & Exercise > Sport and Exercise
Research Priority Areas: Sport, Exercise, Health & Wellbeing
Depositing User: Anne Pengelly
Date Deposited: 21 Sep 2015 08:57
Last Modified: 10 Mar 2016 16:33
URI: http://eprints.glos.ac.uk/id/eprint/2440

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