Study related to the double product break point during the graded exercise test

The purpose of this study was to examine the relationship between the catecholamine threshold （CAT） and the double product break point （DPBP） under various condition and to pursue the validity of DPBP as the marker of aerobic capacity for the optimal exercise intensity to improve physical fitness。我们找到了后续行动。（1）DPBP和CAT下的两种氧化物和hypotic条件之间的重要阴性关系都找到了。作为预期的，DP对Vo 2增加了CAT上的斜率。这些发现证实了我们的hypothesis，因为DPBP在sympathetic神经活动中的作用。（2） Hypoximia did not alter the %VO2max at the DPBP。在补充中，DPBP和VT都与患者的心脏病发生了变化，运动训练后的VO-D22-D2峰值。这些发现建议，因为它是耐久性容量的一个有用的标记，可以确定最佳练习强度以提高航空性能。（3） Beta blockers没有从VT中分离DPBP（可能已经被预期）。DPBP和VT之间的强烈积极关联，因为DPBP可以用作VT的替代品。（4）相对于VT之上的平均血液压力的回归线的斜率大于VT以下的水平。本结果建议，即所谓的血液压力增加，非线性地增加在工作负载期间的分级练习和斜坡成为VT以上的严重steeper。

The purpose of this study was to examine the relationship between the catecholamine threshold (CAT) and the double product break point (DPBP) under various condition and to pursue the validity of DPBP as the marker of aerobic capacity for the optimal exercise intensity to improve physical fitness. We found the following.(1) Significant negative relationship between DPBP and CAT under both nomoxic and hyposic conditions was found. As expected, the slope of the DP against Vo2 increases steeply above the CAT. These findings confirmed our hypothesis that DPBP implies steeper increases in sympathetic nervous activity.(2) Hypoximia did not alter the % VO2 max at the DPBP. In addition, both the DPBP and VT in patients with heart disease changed proportionally with the VOィイD22ィエD2 peak after exercise training. These findings suggest that it is useful marker of the endurance capacity as well as to determine the optimal exercise intensity to improve aerobic capacity.(3) Beta blockers did not dissociate DPBP from VT as may have been expected. The strong positive correlation between DPBP and VT indicates that DPBP can be used as an alternative to VT.(4) The slope of the regression line formed for the mean blood pressure above the VT was greater than that below the VT. This result suggests that the mean blood pressure increases nonlinearly to increase in work load during graded exercise and the slope becomes much steeper above the VT.