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• W2520157598 abstract "Physical training increases skeletal muscle Na + ,K + -ATPase content (NKA) and improves exercise performance, but the effects of inactivity per se on NKA content and isoform abundance in human muscle are unknown. We investigated the effects of 23-day unilateral lower limb suspension (ULLS) and subsequent 4-wk resistance training (RT) on muscle function and NKA in 6 healthy adults, measuring quadriceps muscle peak torque; fatigue and venous [K + ] during intense one-legged cycling exercise; and skeletal muscle NKA content ([ 3 H]ouabain binding) and NKA isoform abundances (immunoblotting) in muscle homogenates (α 1-3 , β 1–2 ) and in single fibers (α 1–3 , β 1 ). In the unloaded leg after ULLS, quadriceps peak torque and cycling time to fatigue declined by 22 and 23%, respectively, which were restored with RT. Whole muscle NKA content and homogenate NKA α 1–3 and β 1–2 isoform abundances were unchanged with ULLS or RT. However, in single muscle fibers, NKA α 3 in type I (−66%, P = 0.006) and β 1 in type II fibers (−40%, P = 0.016) decreased after ULLS, with other NKA isoforms unchanged. After RT, NKA α 1 (79%, P = 0.004) and β 1 (35%, P = 0.01) increased in type II fibers, while α 2 (76%, P = 0.028) and α 3 (142%, P = 0.004) increased in type I fibers compared with post-ULLS. Despite considerably impaired muscle function and earlier fatigue onset, muscle NKA content and homogenate α 1 and α 2 abundances were unchanged, thus being resilient to inactivity induced by ULLS. Nonetheless, fiber type-specific downregulation with inactivity and upregulation with RT of several NKA isoforms indicate complex regulation of muscle NKA expression in humans." @default.
• W2520157598 created "2016-09-23" @default.
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• W2520157598 date "2016-11-01" @default.
• W2520157598 modified "2023-10-06" @default.
• W2520157598 title "Dissociation between short-term unloading and resistance training effects on skeletal muscle Na⁺,K⁺-ATPase, muscle function, and fatigue in humans" @default.
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• W2520157598 doi "https://doi.org/10.1152/japplphysiol.00558.2016" @default.
• W2520157598 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27633740" @default.
• W2520157598 hasPublicationYear "2016" @default.
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