Agadzhanian N A, Elfimov A I, Severin A E, Pas I A
Kosm Biol Aviakosm Med. 1984 May-Jun;18(3):65-8.
A study was carried out to investigate exercise tolerance, gas exchange and external respiration of Latin-American students who lived in Moscow for a year. As controls Soviet students residing in and around Moscow were used. The above parameters were measured at a different time of the day in response to a hypercapnic exposure. Exercise tolerance was determined using the test PWC170. External respiration and gas exchange were investigated at rest and during 5 min exercises with a load of 1 and 2 Wt/kg body weight. CO2 sensitivity was determined by means of the rebreathing method. In the evening the Latin-American students showed a trend towards an increase of the cardiorespiratory activity and exercise tolerance. The Soviet students did not display changes in exercise tolerance. The Latin-American students showed an increase in the morning and a decrease in the evening of external respiration reactions. The Soviet students exhibited opposite variations. Direct alveolar measurements demonstrated an increase of pCO2 in the alveolar air in the Latin-American students in the evening and a decrease of the parameter in the Soviet students. It is suggested that cyclic changes in external respiration in response to hypercapnia are associated with exercise tolerance.
一项研究旨在调查在莫斯科生活了一年的拉丁美洲学生的运动耐力、气体交换和外呼吸情况。以居住在莫斯科及其周边的苏联学生作为对照。上述参数是在一天中的不同时间，针对高碳酸血症暴露进行测量的。运动耐力通过PWC170测试来确定。外呼吸和气体交换在静息状态以及以1和2体重/千克的负荷进行5分钟运动期间进行研究。二氧化碳敏感性通过重复呼吸法来确定。晚上，拉丁美洲学生表现出心肺活动和运动耐力增加的趋势。苏联学生的运动耐力没有变化。拉丁美洲学生外呼吸反应在早晨增加，晚上减少。苏联学生则表现出相反的变化。直接肺泡测量显示，晚上拉丁美洲学生肺泡气中的pCO2增加，而苏联学生该参数下降。研究表明，对高碳酸血症的外呼吸周期性变化与运动耐力有关。
