Key result
Treadmill walking at speeds faster than 3 miles/hour resulted in variant steady state gain and time constants of heart rate response, with offset exercise time constants longer than onset.
In a single-subject physiological model, heart rate response dynamics varied at walking speeds above 3 miles/hour, with recovery (offset) taking longer than onset.
Variable HR kinetics above 3 mph may affect exercise testing interpretation; leaves open generalizability of single-subject models.
Heart rate is one of the major indications of human cardiovascular response to exercises.This study investigates human heart rate response dynamics to moderate exercise.A healthy male subject has been asked to walk on a motorised treadmill under a predefined exercise protocol.ECG, body movements, and oxygen saturation (SpO 2 ) have been reliably monitored and recorded by using non-invasive portable sensors.To reduce heart rate variation caused by the influence of various internal or external factors, the designed step response protocol has been repeated three times.Experimental results show that both steady state gain and time constant of heart rate response are not invariant when walking speed is faster than 3 miles/hour, and time constant of offset exercise is noticeably longer than that of onset exercise.
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Steven W. Su (2010) studied Healthy (n=1). Moderate exercise (treadmill walking) was evaluated on Heart rate response dynamics (steady state gain and time constant). Treadmill walking at speeds faster than 3 miles/hour resulted in variant steady state gain and time constants of heart rate response, with offset exercise time constants longer than onset.
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