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Measurement of maximal isometric torque and muscle quality of the knee extensors and flexors in healthy 50-to 70-year-old women

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dc.contributor.author Francis, Peter
dc.contributor.author Toomey, Clodagh M.
dc.contributor.author McCormack, William
dc.contributor.author Lyons, Mark
dc.contributor.author Jakeman, Philip M.
dc.date.accessioned 2018-04-10T08:25:06Z
dc.date.available 2018-04-10T08:25:06Z
dc.date.issued 2017
dc.identifier.uri http://hdl.handle.net/10344/6729
dc.description peer-reviewed en_US
dc.description.abstract Muscle quality is defined as strength per unit muscle mass. The aim of this study was to measure the maximal voluntary isometric torque of the knee extensor and flexor muscle groups in healthy older women and to develop an index of muscle quality based on the combined knee extensor and flexor torque per unit lean tissue mass (LTM) of the upper leg. One hundred and thirty-six healthy 50-to 70-year-old women completed an initial measurement of isometric peak torque of the knee extensors and flexors (Con-Trex MJ; CMV AG, Dubendorf, Switzerland) that was repeated 7 days later. Subsequently, 131 women returned for wholeand regional-body composition analysis (iDXA (TM); GE Healthcare, Chalfont St Giles, Buckinghamshire, UK). Isometric peak torque demonstrated excellent within assessment reliability for both the knee extensors and flexors (ICC range: 0.991-1.000). Test-retest reliability was lower (ICC range: 0.777-0.828) with an observed mean increase of 5% in peak torque [6.2 (17.2) N m] on the second day of assessment (P<0.001). The relative mean decrease in combined isometric peak torque (-12.2%; P = 0.001) was double that of the relative, non-significant, median difference in upper leg LTM (-5.3%; P = 0.102) between those in the 5th and 6th decade. The majority of difference in peak isometric torque came from the knee extensors (15.1 N m, P<0.001 versus 2.4 N m, P = 0.234). Isometric peak torque normalized for upper leg LTM (muscle quality) was 8% lower between decades (P = 0.029). These findings suggest strength per unit tissue may provide a better indication of age-related differences in muscle quality prior to change in LTM. en_US
dc.language.iso eng en_US
dc.publisher Wiley and Sons Ltd en_US
dc.relation.ispartofseries Clinical Physiology and Functional Imaging;37 (4), pp. 448-455
dc.relation.uri https://doi.org/10.1111/cpf.12332
dc.rights This is the author version of the following article: Clinical Physiology and Functional Imaging 2017 37 (4), pp. 448-455 Measurement of maximal isometric torque and muscle quality of the knee extensors and flexors in healthy 50-to 70-year-old women Francis, PF, Toomey, C, McCormack, W and Lyons, M and Jakeman, P which has been published in final form at: https://doi.org/10.1111/cpf.12332 This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving. http://olabout.wiley.com/WileyCDA/Section/id-828039.html#terms
dc.subject ageing en_US
dc.subject lean tissue mass en_US
dc.subject peak torque en_US
dc.subject reliability en_US
dc.subject sarcopenia en_US
dc.title Measurement of maximal isometric torque and muscle quality of the knee extensors and flexors in healthy 50-to 70-year-old women en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.date.updated 2018-04-06T14:44:18Z
dc.description.version ACCEPTED
dc.identifier.doi 10.1111/cpf.12332
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US
dc.internal.rssid 2718751
dc.internal.copyrightchecked Yes
dc.identifier.journaltitle Clinical Physiology And Functional Imaging
dc.description.status peer-reviewed


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