[Study on anaerobic threshold in normal pregnant women].

Nihon Sanka Fujinka Gakkai zasshi Pub Date : 1996-07-01
M Matsushita, M Asai, S Saegusa, K Kobayashi, M Suzuki, M Noguchi, M Nakanishi, S Niwa
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Abstract

We evaluated the anaerobic threshold (AT) in 104 normal pregnant women mainly in their second trimester. Each exercise testing was performed by using incremental bicycle ergometry at a pedal frequency of 60rpm while monitoring maternal heart rate, maternal blood pressure, minute ventilation (VE),oxygen uptake (VO2) and carbon dioxide output (VCO2) every 30 seconds. The AT was determined by estimating the point of departure from linearity of the plot of VE as a function of VO2. We could determine the AT in 100 cases (96.2%), and their AT values and the heart rates at AT point were 14.7 +/- 1.7ml/min/kg (mean +/- S.D.) and 128 +/- 12bpm, respectively. AT decreased significantly (p < 0.01) with the length of gestation, because of increased maternal body weight. The heart rate at the AT also declined significantly (p < 0.05) with gestational age, but it had no relation with maternal body weight. These results show that the maternal heart rate becomes hard to increase with gestational age, so that the maximal heart rate, as an index of exercise intensity during exercise should decrease with advancing gestational age.

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【正常孕妇无氧阈的研究】。
我们评估了104例正常孕妇的无氧阈值(AT),主要是在妊娠中期。每项运动测试采用增量式自行车几何测量法进行,踏板频率为60rpm,每30秒监测一次产妇心率、血压、分钟通气量(VE)、摄氧量(VO2)和二氧化碳排放量(VCO2)。通过估计VE曲线偏离线性的点作为VO2的函数来确定AT。100例(96.2%)患者的AT值和AT点心率分别为14.7 +/- 1.7ml/min/kg(平均+/- S.D.)和128 +/- 12bpm。AT随妊娠期延长而显著降低(p < 0.01),原因是母体体重增加。at时的心率也随胎龄显著下降(p < 0.05),但与体重无关。这些结果表明,随着孕龄的增加,产妇心率很难增加,因此,作为运动强度指标的最大心率应随着孕龄的增加而降低。
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