Influence of vitamin D mushroom powder supplementation on exercise-induced muscle damage in vitamin D insufficient high school athletes |
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| Authors: | R Andrew Shanely David C Nieman Amy M Knab Nicholas D Gillitt Mary Pat Meaney Fuxia Jin |
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| Institution: | 1. Human Performance Laboratory, Appalachian State University, Kannapolis, NC, USA;2. College of Health Sciences, Appalachian State University, Boone, NC, USAshanelyra@appstate.edu;4. College of Health Sciences, Appalachian State University, Boone, NC, USA;5. Dole Nutrition Research Laboratory, Kannapolis, NC, USA |
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| Abstract: | AbstractIncidence of vitamin D deficiency is increasing worldwide. The purpose of this study was to determine if supplementation with vitamin D2 from Portobello mushroom powder would enhance skeletal muscle function and attenuate exercise-induced muscle damage in low vitamin D status high school athletes. Participants were randomised to Portobello mushroom powder (600 IU/d vitamin D2) or placebo for 6 weeks. Participants then completed a 1.5-h exercise session designed to induce skeletal muscle damage. Blood samples and measures of skeletal muscle function were taken pre-supplementation, post-supplementation/pre-exercise and post-exercise. Six weeks supplementation with vitamin D2 increased serum 25(OH)D2 by 9.9-fold and decreased serum 25(OH)D3 by 28%. Changes in skeletal muscle function and circulating markers of skeletal muscle damage did not differ between groups. In conclusion, 600 IU/d vitamin D2 increased 25(OH)D2 with a concomitant decrease in 25(OD)D3, with no effect on muscular function or exercise-induced muscle damage in high school athletes. |
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| Keywords: | 25-hydroxyvitamin D exercise-induced muscle damage adolescents biomarkers skeletal muscle LC-MS/MS |
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