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Title: Validity and reliability of strain gauge measurement of volitional quadriceps force in patients with COPD
Authors: Rodrigues, Fernanda Machado
Demeyer, Heleen
Hornikx, Miek
Camillo, Carlos Augusto
Calik-Kutukcu, Ebru
Burtin, Chris 
Janssens, Wim
Troosters, Thierry
Osadnik, Christian
Issue Date: 2017
Source: CHRONIC RESPIRATORY DISEASE, 14(3), p. 289-297
Abstract: This study investigated the validity and reliability of fixed strain gauge measurements of isometric quadriceps force in patients with chronic obstructive pulmonary disease (COPD). A total cohort of 138 patients with COPD were assessed. To determine validity, maximal volitional quadriceps force was evaluated during isometric maximal voluntary contraction (MVC) manoeuvre via a fixed strain gauge dynamometer and compared to (a) potentiated non-volitional quadriceps force obtained via magnetic stimulation of the femoral nerve (twitch (Tw); n = 92) and (b) volitional computerized dynamometry (Biodex; n = 46) and analysed via correlation coefficients. Test-retest and absolute reliability were determined via calculations of intra-class correlation coefficients (ICCs), smallest real differences (SRDs) and standard errors of measurement (SEMs). For this, MVC recordings in each device were performed across two test sessions separated by a period of 7 days (n = 46). Strain gauge measures of MVC demonstrated very large correlation with Tw and Biodex results (r = 0.86 and 0.88, respectively, both p < 0.0001). ICC, SEM and SRD were numerically comparable between strain gauge and Biodex devices (ICC = 0.96 vs. 0.93; SEM = 8.50 vs. 10.54 N<bold>m and SRD </bold>= 23.59 vs. 29.22 N<bold>m</bold>, respectively). The results support that strain gauge measures of quadriceps force are valid and reliable in patients with COPD.
Notes: [Rodrigues, Fernanda Machado; Demeyer, Heleen; Hornikx, Miek; Camillo, Carlos Augusto; Troosters, Thierry; Osadnik, Christian] KU Leuven Univ Leuven, Dept Rehabil Sci, Leuven, Belgium. [Rodrigues, Fernanda Machado; Camillo, Carlos Augusto; Janssens, Wim; Troosters, Thierry] Univ Hosp Leuven, Dept Resp Dis, Leuven, Belgium. [Demeyer, Heleen] Ctr Res Environm Epidemiol CREAL, ISGlobal, Barcelona, Spain. [Hornikx, Miek] Univ Hosp Leuven, Dept Cardiovasc Sci, Leuven, Belgium. [Calik-Kutukcu, Ebru] Hacettepe Univ, Dept Physiotherapy & Rehabil, Ankara, Turkey. [Burtin, Chris] Hasselt Univ, Biomed Res Inst, Fac Med & Life Sci, Rehabil Res Ctr, Diepenbeek, Belgium. [Osadnik, Christian] Monash Univ, Dept Physiotherapy, Clayton, Vic, Australia. [Osadnik, Christian] Inst Breathing & Sleep, Heidelberg, Vic, Australia. [Osadnik, Christian] Monash Hlth, Monash Lung & Sleep, Clayton, Vic, Australia.
Keywords: Isometric force measurement; muscle testing; rehabilitation; assessment; chronic obstructive pulmonary disease;isometric force measurement; muscle testing; rehabilitation; assessment; chronic obstructive pulmonary disease
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ISSN: 1479-9723
e-ISSN: 1479-9731
DOI: 10.1177/1479972316687210
ISI #: 000407141900008
Rights: Creative Commons CC BY-NC: This article is distributed under the terms of the Creative Commons Attribution-Non Commercial 3.0 License ( which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (
Category: A1
Type: Journal Contribution
Validations: ecoom 2018
Appears in Collections:Research publications

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