Carta P, Aru G, Barbieri M T, Mele M
Istituto di Medicina del Lavoro, Università di Cagliari.
Med Lav. 1991 Jan-Feb;82(1):56-64.
A group of 26 male long-distance runners performed 3 cycle ergometer tests of progressively increasing intensity up to exhaustion. The tests were performed on 3 different days. The workload increased as follows: 30 Watts every 3 min (test I), 10 Watts every min (test II), and 30 Watts every min (test III). Ventilatory and gas exchange measurements were averaged every 30 sec during each test. The heart rate (HR) was monitored continuously by ECG. In each test the anaerobic threshold (AT) was determined using ventilatory and gas exchange indices (VE, VCO2, VE/VO2). The work load on exhaustion and power at AT were the same comparing test I with test II, but these values were significantly higher in the 30 Watts/1 minute test. Conversely, maximal oxygen uptake (VO2 max) and the VO2 observed at anaerobic threshold were comparable in the 3 protocols. The slopes of VO2, VCO2, VE and HR against the work load (Watts) were identical in test I and II, but were slower in test III. However, no differences in the ventilatory and heart rate patterns versus oxygen uptake were observed comparing the three exercise tests. These results suggest a good comparability between the 30 Watts/3 min test and the 10 Watt/1 min protocol. Furthermore, for workloads below AT, a steady state was attained at the 3rd minute of each phase during test I, while oxygen uptake and other cardio-respiratory variables were underestimated during the protocol in which phases of 30 Watts were maintained only for 1 minute.(ABSTRACT TRUNCATED AT 250 WORDS)
26名男性长跑运动员进行了3次递增负荷的自行车测力计测试，直至力竭。测试在3个不同的日子进行。负荷增加情况如下：每3分钟增加30瓦（测试I），每分钟增加10瓦（测试II），每分钟增加30瓦（测试III）。每次测试期间，每30秒对通气和气体交换测量值取平均值。通过心电图持续监测心率（HR）。在每次测试中，使用通气和气体交换指标（VE、VCO2、VE/VO2）确定无氧阈（AT）。将测试I与测试II相比，力竭时的负荷和无氧阈时的功率相同，但在3分钟增加30瓦的测试中，这些值显著更高。相反，三种方案中的最大摄氧量（VO2 max）和无氧阈时的VO2相当。测试I和II中，VO2、VCO2、VE和HR相对于负荷（瓦）的斜率相同，但测试III中的斜率较慢。然而，比较三项运动测试时，未观察到通气和心率模式与摄氧量之间存在差异。这些结果表明，3分钟增加30瓦的测试与每分钟增加10瓦的方案之间具有良好的可比性。此外，对于低于无氧阈的负荷，测试I中每个阶段的第3分钟达到了稳定状态，而在仅将30瓦阶段维持1分钟的方案中，摄氧量和其他心肺变量被低估。（摘要截短于250字）
