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15名健康男性职业潜水员,分8组,每组5人。在高低压舱内,第1,2组减压到海拔3500m分别适应48和24h后再分别减压到海拔5000m和4500m,第3组直线减压到4500m。在低压暴露期间,受试者进行30m或50m模拟空气潜水。用常规开放式法测定其静息、运动和运动后通气量,并用气袋采集呼出气样,分析氧和二氧化碳含量。第1、2组的运动负荷量为600kg·m/min,第8组为800kg·m/min。除第1组的静息通气量外,低压暴露或经潜水再返回低压的静息和运动通气量都显著高于海平对照值(P<0.05)。第2组高压下的静息通气量虽比海平对照值略有增加,但低于低压暴露值;而运动通气量低于海平对照值和低压暴露值。第1、2组在低压暴露时的静息和运动摄氧量与海平对照相比无显著变化,但第3组减少显著(P<0.01)。高压下的静息、运动摄氧量与海平对照相比除个别人次外亦无显著变化。低压暴露下静息和运动的气体交换率都比海平对照值高,第2、3组高压下的气体交换率低于海平对照值。
15 healthy male professional divers, divided into 8 groups of 5 people each. In the high and low pressure cabin, the first and second sets of decompression to an altitude of 3500m were adapted to 48 and 24h and then decompression to 5000m and 4500m above sea level, the third group linear decompression to 4500m. Subjects underwent 30 m or 50 m simulated air diving during low pressure exposure. The resting, exercise and post-exercise ventilation were measured by the conventional open method, and exhaled breath samples were collected with air bags to analyze oxygen and carbon dioxide content. The exercise load in group 1 and group 2 was 600 kg · m / min and that in group 8 was 800 kg · m / min. Except for resting ventilation in group 1, both resting and ventilatory volumes at low pressure exposure or after diving and returning to low pressure were significantly higher than those at sea level (P <0.05). In group 2, the resting ventilation at high pressure was slightly higher than that at sea level, but lower than the value of low pressure exposure; while the value of exercise ventilation was lower than that at sea level and low pressure. There was no significant difference in resting and exercise oxygen uptake between groups 1 and 2 at low pressure exposure compared with sea level control, but there was a significant decrease in group 3 (P <0.01). Resting at high pressure, exercise oxygen uptake compared with the sea level control in addition to individual trips there was no significant change. The gas exchange rate of rest and exercise exposed to low pressure was higher than that of sea level control, and the gas exchange rates of the second and third groups under high pressure were lower than the sea level control.