Abstract
There is no literature about different patterns of heart rate response during different stages of exercise stress electrocardiography using Bruce protocol in normal persons. We studied seventy five individuals after strictly excluding various conditions that could affect exercise capacity or heart rate response. Only ten persons had nearly linear progressive increase in heart rate. Other individuals had variable increase during different stages of stress. We observed eleven different types of responses. Our study shows that every individual has an intrinsic maximal heart rate that can be attained during exercise. Magnitude of the increase in heart rate during a particular stage of stress is influenced by the magnitude of increase in heart rate and percentage of age predicted maximal heart rate attained by the individual prior to that stage. It is also influenced by the relative activation of the sympathetic and the parasympathetic systems during and prior to a particular stage.
Published Version
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