Living in New England when the temperature outside drops, more athletes are forced to train indoors to maintain their health and achieve their performance goals. Athletes who train indoors during these winter months tend to exhibit low serum 25-hydroxy (aka vitamin D) concentrations in their body due to a lack of sunlight exposure. This has been linked to impaired exercise performance. Studies have shown that 4-month oral supplementation of vitamin D₃ (2000 IU per day) has beneficial effects on muscular performance and injury occurrence in elite athletes.
Bottom line: After getting cleared by a medical professional, vitamin D supplementation can help you avoid injury and continue to get the most out of your body while exercising indoors during the winter months!