低氧、气功对抗模拟失重后立位中心脏节律变化的观察

Counteracting Effect of Hypoxia and Qigong on Cardiac Rhythm during Orthostatic Test Post Simulated Weightlessness.

目的探讨新的对抗失重措施。方法１５名、年龄１９～２２岁的健康男性青年为被试者。头低位－６°卧床（－６°ＨＤＢＲ）模拟失重，持续２１ｄ。实验分对照组（单纯卧床）、低氧组（卧床＋低氧）和气功组（卧床＋气功）。低氧组卧床期间每人每天吸两次低氧，每次２０ｍｉｎ。气功组卧床中每天练功三次，每次４５ｍｉｎ。三组卧床前、后进行２０ｍｉｎ＋７５°的立位实验。结果三组被试者在卧床前立位中的心电图未发生明显变化，心律正常。卧床２１ｄ后立位实验中对照组２人出现房性和窦性心律紊乱；气功组２人出现结性心律紊乱。低氧组所有人均未发生心律紊乱。结论低氧对抗卧床后立位耐立降低效果较好。

Objective To try to find a new method for countermeasuring the effect of simulated weightlessness. Methods The study was carried out in fifteen male healthy subjects, 19～22 years,-6° head down bed rest(-6° HDBR) for 21 d was used as a weightlessness simulation model.The subjects were divided into three groups:control group (-6° HDBR), hypoxia group(-6 ° HDBR+ inhalation of hypoxic gas mixture two times a day, 20 min each time) and Qigong group(-6° HDBR+Qigong,three times per day,45 min each time).Orthostatic test (+75° 20 min)was conducted on each subject pre and post HDBR. Results Cardiac rhythm during the orthostatic test was normal pre HDBR but sinus cardiac arrhythmias were observed in two subjects of the control group and nodal cardiac arrhythmias were observed in two subjects in Qigong group after HDBR.No cardiac arrhythmia was found in hypoxia group. Conclusion Hypoxia is more effective in countermeasuring orthostatic intolerance after weightlessness than Qigong.