title: Effect of vitamin D supplementation on muscle energy phospho-metabolites: a ³¹P magnetic resonance spectroscopy-based pilot study.
abstract: There are several published reports on the prevalence of low vitamin D levels in otherwise healthy Indian population. Vitamin D deficiency has shown variable effect on muscle performance and strength but there is paucity of data on the effect of vitamin D deficiency on muscle energy metabolism. The present study was proposed to investigate the influence of severe vitamin D deficiency on high-energy metabolite levels in resting skeletal muscle and thereafter, monitor the response after vitamin D supplementation using ³¹P magnetic resonance spectroscopy (MRS). Study was conducted on 19 otherwise healthy subjects but with low serum 25(OH)D levels (<5 ng/ml). Subjects were supplemented with cholecalciferol at a dose of 60,000 IU/week for 12 weeks. MRS measurements of inorganic phosphate (Pi), phosphocreatine (PCr), phosphodiester (PDE) and ATP of the calf muscle were taken pre- and post-vitamin D supplementation. The study revealed significantly increased PCr/Pi ratio and decreased [Pi] and PDE/ATP ratio with raised serum 25(OH)D levels after 12 weeks of supplementation. The study indicates that serum 25(OH)D level plays an important role in improving the skeletal muscle energy metabolism and vitamin D deficiency might be one of the primary reasons for prevalence of low PCr/Pi ratio and high PDE values in normal Indian population as reported earlier. The findings of this preliminary study are highly encouraging and warrant further in-depth research, involving larger number of subjects of different age groups, regions and socio-economic sections of the society to further strengthen a correlation between vitamin D levels and muscle energy metabolism.
authors.affiliation: NMR Research Centre .
authors.forename: Poonam
authors.initials: P
authors.lastname: Rana
authors.forename: Raman Kumar
authors.initials: RK
authors.lastname: Marwaha
authors.forename: Pawan
authors.initials: P
authors.lastname: Kumar
authors.forename: Archana
authors.initials: A
authors.lastname: Narang
authors.forename: M Memita
authors.initials: MM
authors.lastname: Devi
authors.forename: Rajendra Prasad
authors.initials: RP
authors.lastname: Tripathi
authors.forename: Subash
authors.initials: S
authors.lastname: Khushu
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D000293:Adolescent; D000328:Adult; D002112:Calcifediol / Q000097:blood; D002762:Cholecalciferol / Q000627:therapeutic use*; D019587:Dietary Supplements; D004734:Energy Metabolism; D005260:Female; D006801:Humans; D006962:Hyperparathyroidism, Secondary / Q000209:etiology / Q000517:prevention & control; D007194:India; D008279:Magnetic Resonance Imaging; D008297:Male; D018482:Muscle, Skeletal / Q000201:enzymology / Q000378:metabolism*; D010725:Phosphocreatine / Q000378:metabolism; D010727:Phosphoric Diester Hydrolases / Q000378:metabolism; D010759:Phosphorus Isotopes; D010865:Pilot Projects; D012720:Severity of Illness Index; D014808:Vitamin D Deficiency / Q000097:blood / Q000178:diet therapy* / Q000378:metabolism / Q000503:physiopathology; D051598:Whole Body Imaging; D055815:Young Adult
chemical_list: D010759:Phosphorus Isotopes; D010725:Phosphocreatine; D002762:Cholecalciferol; D000255:Adenosine Triphosphate; D010727:Phosphoric Diester Hydrolases; D002112:Calcifediol
keywords: Cholecalciferol; MRS; energy metabolism; oxidative phosphorylation; phosphocreatine; vitamin D deficiency