[Microvolt T-wave alternans in adolescent elite athletes].

Microvolt T-wave alternans (MTA) is one of markers of electrical myocardial instability.to elucidate normal range of MTA parameters during bicycle exercise test (ET) in adolescent elite athletes.We examined 500 athletes aged 9-18 (mean 16.1+/-2.2) years members of national teams of 27 kinds of sport. There were 333 females with mean age 16.0+/-1.01 years and 167 males with mean age 16.3+/-1.4. All athletes underwent ECG registration in clino- and ortho- positions and bicycle ET with automatic analysis.