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Although the variation of the physiological status of the cardiovascular system can be shown graphically by the second\u2010order difference plot, the descriptive ability of existing indicators for this plot is insufficient. As a result, the physiological information contained in the second\u2010order difference plot cannot be extracted adequately. Addressing the problem, the temporal variation measure analysis is presented to describe distribution patterns of scatter points in the second\u2010order difference plot quantitatively and extract the acceleration information for a variation of heart rate variability. Experiment results demonstrate the effectiveness of the temporal variation measure analysis. 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