高原篮球竞赛对■O_2max和心功能的影响

THE EFFECTS OF BASKETBALL PLAYING ON MAXIMAL OXYGEN UPTAKE AND CARDIAC FUNCTION AT HIGH ALTITUDE

作者观察了在拉萨参加篮球比赛的队员(?)O_2max、STI等呼吸,循环方面的指标,认为在高原地区参加比赛至少应有8天的习服时间,否则运动员的有氧能力将下降。

The purpose of this article is to investigate the effects of acclimatization period and physical performances at sea level on the aerobic capacity and left ventricular function at altitude. Subjects were divided into 3 groups according to their physical performance level (A. B and C grades) and acclimatization period. Group 1 consisted of 7 players (A grade), group 2 of 6 players (B grade) and group 3 of 4 players (C grade), who stayed at an altitute of 3658 m for 5,8 and 46 days respectively. Maximal oxygen uptake, ventilation, heart rate, LVSTI, blood gas and Hb were determined during maximal work on a bicycle ergometer before and after 5 basketball matches A decrcasc of VO_2max, VEmax, HRmax and the body weight, a prolonged PEP and an increase of PEP/ET time ratio were found in the A grade team after the matches, but the C grade team showed no significant changes, and only a slight decrease of VO_2max, prolonged PEP and increase of PEP/ET time ratio were observed in the B grade team. No remarkable change in Hb was noticed in the three teams. These resets suggest that the change of aerobic capacity and cardiac function depends chiefly on the acclimatization period rather than on competitive capacity at sea level, and that an athlete needs a period of at least 8 days for acclimatization before taping up heavy exercises at an altitude of 3600 m or so.