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dc.contributor.authorPerry, BD
dc.contributor.authorLevinger, P
dc.contributor.authorMorris, HG
dc.contributor.authorPetersen, AC
dc.contributor.authorGarnham, AP
dc.contributor.authorLevinger, I
dc.contributor.authorMcKenna, MJ
dc.date.accessioned2020-12-17T04:39:37Z
dc.date.available2020-12-17T04:39:37Z
dc.date.issued2015-02-01
dc.identifierpii: 3/2/e12294
dc.identifier.citationPerry, B. D., Levinger, P., Morris, H. G., Petersen, A. C., Garnham, A. P., Levinger, I. & McKenna, M. J. (2015). The effects of knee injury on skeletal muscle function, Na+, K+-ATPase content, and isoform abundance. PHYSIOLOGICAL REPORTS, 3 (2), https://doi.org/10.14814/phy2.12294.
dc.identifier.issn2051-817X
dc.identifier.urihttp://hdl.handle.net/11343/255405
dc.description.abstractWhile training upregulates skeletal muscle Na(+), K(+)-ATPase (NKA), the effects of knee injury and associated disuse on muscle NKA remain unknown. This was therefore investigated in six healthy young adults with a torn anterior cruciate ligament, (KI; four females, two males; age 25.0 ± 4.9 years; injury duration 15 ± 17 weeks; mean ± SD) and seven age- and BMI-matched asymptomatic controls (CON; five females, two males). Each participant underwent a vastus lateralis muscle biopsy, on both legs in KI and one leg in CON. Muscle was analyzed for muscle fiber type and cross-sectional area (CSA), NKA content ([(3)H]ouabain binding), and α1-3 and β1-2 isoform abundance. Participants also completed physical activity and knee function questionnaires (KI only); and underwent quadriceps peak isometric strength, thigh CSA and postural sway assessments in both injured and noninjured legs. NKA content was 20.1% lower in the knee-injured leg than the noninjured leg and 22.5% lower than CON. NKA α2 abundance was 63.0% lower in the knee-injured leg than the noninjured leg, with no differences in other NKA isoforms. Isometric strength and thigh CSA were 21.7% and 7.1% lower in the injured leg than the noninjured leg, respectively. In KI, postural sway did not differ between legs, but for two-legged standing was 43% higher than CON. Hence, muscle NKA content and α2 abundance were reduced in severe knee injury, which may contribute to impaired muscle function. Restoration of muscle NKA may be important in rehabilitation of muscle function after knee and other lower limb injury.
dc.languageEnglish
dc.publisherWILEY
dc.titleThe effects of knee injury on skeletal muscle function, Na+, K+-ATPase content, and isoform abundance
dc.typeJournal Article
dc.identifier.doi10.14814/phy2.12294
melbourne.affiliation.departmentMedical Education
melbourne.affiliation.departmentMedicine and Radiology
melbourne.source.titlePhysiological Reports
melbourne.source.volume3
melbourne.source.issue2
dc.rights.licenseCC BY
melbourne.elementsid1259257
melbourne.contributor.authorMorris, Hayden
melbourne.contributor.authorLevinger, Itamar
dc.identifier.eissn2051-817X
melbourne.accessrightsOpen Access


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