Direct Estimation of Cardiac Reserve Through Analysis of Relation between Oxygen Consumption and Heart Rate During Exercise Testing : THE 9th CONFERENCE ON PREVENTION FOR RHEUMATIC FEVER AND RHEUMATIC HEART DISEASE

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In order to elucidate fundamental relationship between exercise and cardiac reserve, we investigated the parameters of regression equation (VO_2=A・HR+B) between oxygen consumption (VO_2 ml/kg/min) and heart rate (HR) during exercise test (Bruce). 62 male children were devided into 3 groups based on history and clinical evaluation. HR related linearly with VO_2 (average r=0.967, range 0.90~0.993). both of the parameters A and |B| were significantly high in Athlete (A=0.465±0.043, |B|=36±6.07), low in Failed (0.297±0.055, 17.4±6.1) and middle in Ordinary group (0.366±0.078, 23.5±8.6) (p<0.005). Based on our result of linear VO_2-HR relation, and on the previously reported studies that cardiac output linearly and consistently related with VO_2, we considered the meaning of the parameters as follows; A determines the possible maximum stroke volume (SV), and B determines the HR where SV reaches plateau. In conclusion, since the SV is considered as a ;measure of cardiac function, measureing the parameters of VO_2-HR relation allows us to isolate cardiac functional reserve through the exercise tolerance test.
社団法人日本循環器学会の論文
1985-12-20