Zn and Ca in hair samples taken from four athletes have been de-termined by using SR X-ray fluorescence analysis technique. Each sample is scanned point by point at 1.5mm of interval
which corresponds to 5 days of hair growth. Preliminary results show that the change of iron content in hair is related to exercise capacity of athletes
but no observable change is found for Zn and Ca content. It is verified that sport is one of the causes leading to iron deficiency of athletes.