高原（2260m）女子公路自行车运动员的通气无氧阈、乳酸阈和最大氧耗量的研究

STUDIES ON VENTILATION ANAEROBIC THRESHOLD, LACTATE THRESHOLD AND MAXIMAL OXYGEN UPTAKE OF HIGHLAND WOMEN ROAD CYCLISTS

采用实验室递增负荷运动试验和运动现场血乳酸的测定，研究了高原（２２６０ｍ）女子公路自行车运动员的通气无氧阈、乳酸阈及最大氧耗量。结果发现，通气无氧阈时的氧耗量为２．０３ｌ／ｍｉｎ，功率为１３１．４Ｗ；乳酸阈（以运动速度表示）为３３．０ｋｍ／ｈ。通气无氧阈时对应的心率（１３７次／ｍｉｎ）低于乳酸阈的心率（１５３次／ｍｉｎ）。最大氧耗量的绝对值（２．８ｌ／ｍｉｎ）和相对值（４７．４ｍｌ／ｋｇ．ｍｉｎ）分别比平原运动员低２２．２％和２２．９％，但与平原运动员高原训练期间的测试值（２．８ｌ／ｍｉｎ）比较，高原与平原运动员最大氧耗量的差异消失。在相同氧耗量（２．８ｌ／ｍｉｎ）条件下运动时，高原运动员完成的功率（２５１Ｗ）低于平原运动员（２７４Ｗ）。

The ventilation anaerobic threshold (VAT), lactate threshold (LT) and maximal oxygen uptake (O 2 max) of highland (2260m) women road cyclists were studied by progressive exercise test on a bicycle ergometer and determining blood lactate on the spot. The results showed that on VAT, the VO 2 was 2.03 l/min, and the power was 131.4W; LT( express in sports speed )was 33.0 km/h. The HR at VAT was 137beats/min lower than that at LT (153 beats/min ). O 2 max of highland women road cyclists was 2.8 l/min or 47.4 ml/kg·min which was 22.2% or 22.9% lower than that in plain women road cyclists (3.6 l/min or 65.1 ml/kg. min, P <0.01). But there was no difference between highland women road cyclists and plain women road cyclists during altitude (2260m) training. Maximal power of highland women road cyclists (251W) was also lower than that of plain women road cyclists (274W) in the same O 2 max (2.8 l/min) exercise.