To the Editor.— The article by Dimsdale et al1 describing postexercise cardiac morbidity and its relation to plasma catecholamines is of interest but in need of discussion. I agree that the catecholamine tide after maximum exercise may adversely affect patients with coronary ischemia and should be considered when prescribing exercise to the unfit. The possible increased risk of arrhythmias and ischemia for everyone who exercises, however, is debatable. Hartley et al2 and Winder et al3 have shown that the magnitude of catecholamine increase during strenuous exercise is significantly less in enduranced-trained persons. Even Hagberg et al4 (a reference cited by Dimsdale) showed that the one-minute postexercise norepinephrine concentration was less in trained persons than in untrained. Unfortunately, the correction for intersubject variance in Dimsdale's study eliminated any possibility of addressing this. It would have been valuable if the blood pressure-norepinephrine level correlations were compared with aerobic
Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature
Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal
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