title: [Microvolt T-Wave Alternans in Adolescent Elite Athletes].
abstract: Microvolt T-wave alternans (MTA) is one of markers of electrical myocardial instability.
  
  
  OBJECTIVE
  to elucidate normal range of MTA parameters during bicycle exercise test (ET) in adolescent elite athletes.
  
  
  METHODS
  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.
authors.affiliation: Center for Syncope and Arrhythmias in Children and Adolescents of Federal Medico-Biology Agency of Russia, Moskvorechie str. 20, 115409 Moscow, Russia.
authors.forename: V V
authors.initials: VV
authors.lastname: Komolyatova
authors.affiliation: Center for Syncope and Arrhythmias in Children and Adolescents of Federal Medico-Biology Agency of Russia, Moskvorechie str. 20, 115409 Moscow, Russia.
authors.forename: L M
authors.initials: LM
authors.lastname: Makarov
authors.affiliation: Center for Syncope and Arrhythmias in Children and Adolescents of Federal Medico-Biology Agency of Russia, Moskvorechie str. 20, 115409 Moscow, Russia.
authors.forename: N N
authors.initials: NN
authors.lastname: Fedina
authors.affiliation: Center for Syncope and Arrhythmias in Children and Adolescents of Federal Medico-Biology Agency of Russia, Moskvorechie str. 20, 115409 Moscow, Russia.
authors.forename: I I
authors.initials: II
authors.lastname: Kiseleva