# name
Validity and reliability of strain gauge measurement of
                volitional quadriceps force in patients with COPD

# metadata.dc.description.abstract[].value
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.m and SRD = 23.59 vs. 29.22 N.m, respectively). The
                results support that strain gauge measures of quadriceps force
                are valid and reliable in patients with COPD.

# metadata.dc.relation.ispartof[].value
Chronic Respiratory Disease, 2017, vol. 14, num. 3, p. 289-297

# metadata.dc.source[].value
Articles publicats en revistes (ISGlobal)

# metadata.dc.title[].value
Validity and reliability of strain gauge measurement of
                volitional quadriceps force in patients with COPD