Pre-race characteristics and race performance in hyponatremic and normonatremic finishers of Czech ultra-races The stress-associated hyponatremia is a well-known phenomenon in endurance sports and there are certain risk groups for shorter endurance charges such as a marathon. We have now examined in 138 finishers in long-distance races (multi-stay races and 24-hour races in mountain bikes as well as 100km and 24-hour race in progress), whether there are differences in selected variables such as age, gender, club affiliation, workout, experience, body weight and BMIare. There were no differences between athletes with and without hyponatremia in the target.All the work can be read below http://www.gymnica.upol.cz/artkey/gym-201603-0001_pre-race_characteristics_and_race_performance_in_hyponatremic_and_normonatremic_finishers_of_czech_ultra-races.php