Heart Rate Range and All‐Cause Mortality in Older Adults

Response

“…Terms used include the following: heart rate response, oxygen pulse, physiological strain, heart rate slope, metabolic chronotropic relationship, heart rate index, chronotropic response, ΔfC/ΔVO 2 , chronotropic response index, cardiorespiratory response, and chronotropic index. Calculations performed attempting to characterize the cardiovascular response include heart rate ratio between maximum heart rate and resting heart rate (6), heart rate range (7), heart rate reserve being the difference between peak and maximum heart rate (8), percentage of heart rate reserve, and chronotropic response index represented by the ratio of heart rate reserve used to metabolic reserve used at peak exercise (where metabolic rate is estimated in METs from the speed and grade of a treadmill) (9). All of these approaches are trying to describe the heart rate response to increasing oxygen uptake.…”