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Title: Assessment of lower limb muscle strength and power using hand-held and fixed dynamometry: a reliability and validity study.
Epworth Authors: Williams, Gavin
Other Authors: Mentiplay, Benjamin
Perraton, Luke
Bower, Kelly
Adair, Brooke
Pua, Yong-Hao
McGaw, Rebekah
Clark, Ross
Keywords: Muscle Strength
Hand-Held Dynamometry
Isometric Muscle Power
Muscle Power Assessment
Rate of Force Development
Measurement Reliability
Department of Physiotherapy
Lafayette Model-01165
Hoggan MicroFET2
KinCom Dynamometer
Rehabilitation, Mental Health and Chronic Pain Clinical Institute, Epworth HealthCare, Victoria, Australia
Epworth HealthCare, Melbourne, Victoria, Australia
Issue Date: Oct-2015
Publisher: PLOS
Citation: PLoS ONE 10(10): e0140822
Abstract: INTRODUCTION: Hand-held dynamometry (HHD) has never previously been used to examine isometric muscle power. Rate of force development (RFD) is often used for muscle power assessment, however no consensus currently exists on the most appropriate method of calculation. The aim of this study was to examine the reliability of different algorithms for RFD calculation and to examine the intra-rater, inter-rater, and inter-device reliability of HHD as well as the concurrent validity of HHD for the assessment of isometric lower limb muscle strength and power. METHODS: 30 healthy young adults (age: 23±5 yrs, male: 15) were assessed on two sessions. Isometric muscle strength and power were measured using peak force and RFD respectively using two HHDs (Lafayette Model-01165 and Hoggan microFET2) and a criterion-reference KinCom dynamometer. Statistical analysis of reliability and validity comprised intraclass correlation coefficients (ICC), Pearson correlations, concordance correlations, standard error of measurement, and minimal detectable change. RESULTS: Comparison of RFD methods revealed that a peak 200 ms moving window algorithm provided optimal reliability results. Intra-rater, inter-rater, and inter-device reliability analysis of peak force and RFD revealed mostly good to excellent reliability (coefficients ≥ 0.70) for all muscle groups. Concurrent validity analysis showed moderate to excellent relationships between HHD and fixed dynamometry for the hip and knee (ICCs ≥ 0.70) for both peak force and RFD, with mostly poor to good results shown for the ankle muscles (ICCs = 0.31-0.79). CONCLUSIONS: Hand-held dynamometry has good to excellent reliability and validity for most measures of isometric lower limb strength and power in a healthy population, particularly for proximal muscle groups. To aid implementation we have created freely available software to extract these variables from data stored on the Lafayette device. Future research should examine the reliability and validity of these variables in clinical populations.
DOI: doi: 10.1371/journal.pone.0140822
PubMed URL:
ISSN: 1932-6203
Journal Title: PLOS ONE
Type: Journal Article
Affiliated Organisations: School of Exercise Science, Faculty of Health Sciences, Australian Catholic University, Melbourne, Australia.
School of Allied Health, Faculty of Health Sciences, Australian Catholic University, Melbourne, Australia
Department of Physiotherapy, Singapore General Hospital, Singapore
School of Physiotherapy, Faculty of Medicine, Denistry and Health Sciences, The University of Melbourne, Melbourne, Australia.
Type of Clinical Study or Trial: Validation Study
Appears in Collections:Musculoskeletal

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