Supplementation of vitamin D
GS
Subjects from the supplemented group (GS) were given the vitamin D bottle (Vigantol Merck), whereas the non-supplemented group – placebo (GP) received identical bottles with sunflower oil. All participants were asked to take 10 droplets per day (vitamin D or sunflower oil). GS received 5,000 IU of vitamin D daily in the morning. Players and the person who administered the supplementation were blinded to the group’s assignment.