[Seasonal aspects of the oxidative stress in Northeners]

Evaluated were consequences of changes in oxygen demand, bronchial conduction, exercise performance, functioning of antioxidant enzymes and body provision with natural oxidants for the level of free-radical oxidation products in human organism. To this end, a group of essentially healthy young male northerners spending much time outdoors was surveyed over a one-year period. Among the listed parameters oxidation of free radicals was particularly sensitive to seasonal insufficiency of some of the antioxidant enzymes.