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

分级运动测试中双积断点的相关研究

基本信息

批准号：
08458023
负责人：
TANAKA Hiroaki
金额：
$ 4.54万
依托单位：
Fukuoka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

项目摘要

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.

本研究旨在探讨不同条件下儿茶酚胺阈（CAT）与双乘积断点（DPBP）的关系，探讨DPBP作为有氧能力指标，在提高体能的最佳运动强度中的有效性。我们发现了以下内容。(1)DPBP与CAT在无氧和缺氧条件下均呈显著负相关，如预期的那样，DPBP对VO_2的斜率在CAT之上急剧增加，这些结果证实了DPBP意味着交感神经活动急剧增加的假设。(2)低氧未改变DPBP时的%VO 2 max。心脏病患者运动后DPBP和VT均随VO_（22）/VO_（22）峰值的变化而变化。这些结果表明，它是有用的指标的耐力，以及确定最佳的运动强度，以提高有氧能力。(3)β受体阻滞剂并没有像预期的那样使DPBP与VT分离。DPBP与VT之间的强正相关表明DPBP可以作为VT的替代。(4)VT以上平均血压形成的回归线斜率大于VT以下平均血压形成的回归线斜率。这一结果表明，在分级运动期间，平均血压随着工作负荷的增加而非线性地增加，并且斜率在VT以上变得陡峭得多。