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• W2113313112 abstract "It is not known whether vitamin D levels make a significant contribution to muscle dysfunction in chronic obstructive pulmonary disease (COPD). In 104 COPD patients (mean±sd forced expiratory volume in 1 s 44±22 % predicted) and 100 age- and sex-matched controls, serum 25-hydroxyvitamin D (25(OH)D), 1,25-dihydroxyvitamin D (1,25(OH)₂D) and parathyroid hormone (PTH) levels were measured and related to quadriceps strength and endurance. In a subset of 26 patients and 13 controls, quadriceps biopsy was performed and mRNA expression of myogenic regulatory factors (mrf) and fibre-specific myosin heavy chains (MHC) was determined. COPD patients were weaker and less physically active than controls. 25(OH)D levels were similar in both groups (48.5±25.5 nmol·L⁻¹ COPD <i>versus</i> 55.4±28.3 nmol·L⁻¹ control, p=0.07) but PTH levels were significantly higher in patients (5.2±2.3 pmol·mL⁻¹<i>versus</i> 4.4±2.0 pmol·L⁻¹, p=0.01). 1,25(OH)D was significantly correlated with strength in controls, but not in COPD patients and not with quadriceps endurance assessed using repetitive magnetic stimulation in COPD (n=35) or control (n=35) subjects. In controls, but not COPD patients, muscle biopsy analysis showed a negative relationship between 25(OH)D and MHCIIa expression (r²=0.5, p=0.01) and a positive relationship between mrf4 and MHCIIa expression (r²=0.5, p=0.009), and myogenic regulatory factor myf5 and MHCI expression (r²=0.72, p=0.004). In contrast with healthy controls, muscle strength is not associated with vitamin D levels in COPD, which may represent vitamin D resistance." @default.
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• W2113313112 date "2012-05-03" @default.
• W2113313112 modified "2023-10-15" @default.
• W2113313112 title "Vitamin D and skeletal muscle strength and endurance in COPD" @default.
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• W2113313112 doi "https://doi.org/10.1183/09031936.00043112" @default.
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