It is well known that vitamin D3 is important for bone and skeletal health. Research, however, indicates the necessary of vitamin D3 for muscle and immune function, inflammation and athletic performance. The purpose of the study is to examine the effect Vitamin D3, supplementation on athletic health and muscle functions. The Researchers used the experimental method of Pre-post assessment of one experimental group due to the suitability of the nature of the Research. The sample comprises(20)young athletes, they ingested a recommended dose of 2000 IU/ Day for two months(1/10/2019 -30/11/2019) Data were determine pre-post ingestion of vitamin D3,for 25(OH)D, Insulin growth factor(1) Angiotens in converting Enzyme, nitric oxide, pulse rate blood Pressure and of Growth hormone, 5ml venous blood was drawn from each participant pre-post vit D3 ingestion. The Results indicated a significant positive change of the study variables after Vit D3 ingestion. It is concluded that Vit D3, supplementation may affect muscle function and health of the athlete It is Recommended that Vit D3 levels should be checked on annual basis in all athletes for their health
Key words: Vit D3 supplementation, muscle functions, Health, performance, athletes, Hormones
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