UNASSIGNED: We monitored the cardiovascular responses of our participants to a supine and 60° head-up tilt at the same time each day. During the test, we measured blood pressure derived by finger photoplethysmography, which also provided beat-by-beat measures of SV and CO. Afterwards, we compared the SV derived from the photoplethysmography with the one calculated with the different equations that already exist in literature.
UNASSIGNED: The evaluation of the formulae was based on comparing the error of prediction. This residual analysis compared the sum of the squared residuals generated by each formula using the same data set.
UNASSIGNED: Our findings suggest that estimating SV with existing formulae is feasible, showing a good correlation and a relatively small bias. Thus, simply measuring workers\' blood pressure during breaks could estimate their cardiac strain.
■我们每天同时监测参与者对仰卧和60°抬头倾斜的心血管反应。在测试过程中,我们通过手指光电容积描记术测量血压,它还提供了SV和CO的逐点测量。之后,我们将从光电体积描记术得出的SV与文献中已经存在的不同方程计算得出的SV进行了比较。
■公式的评估基于比较预测误差。该残差分析比较了使用相同数据集的每个公式生成的残差平方和。
■我们的研究结果表明,用现有公式估计SV是可行的,表现出良好的相关性和相对较小的偏差。因此,简单地测量工人休息时的血压就可以估计他们的心脏压力。