The purpose was to demonstrate whether daily physical activity influence the heart rate (FIR) kinetics following the sinusoidal exercise in 50 healthy 18 to 69 yrs old men and women. They completed sinusoidal exercise tests varied from 20% HR reserve to 60% HR reserve work rates in HR measured beat by beat. The periods of sinusoidal work rate were 1, 3, 6, 9, and 12 min. The HR kinetics could be approximately described by a first-order model with time delay. Mean response time (MRT, time constants pulse time delay) of the first-order model on response of HR was gradually increased with age. We found a significantly partial correlation between the MRT of HR kinetics and daily physical activity (r=-0.47, P<0.01) and age (r=-0.36, P<0.05). Physical work capacity at 170 bpm (PWC₁₇₀) modified by body mass was measured in the incremental exercise. PWC₁₇₀ was not related to both daily physical activity and age.
　These results suggest that the HR kinetics was more reflected by daily physical activity than age, and PWC₁₇₀ proved to be inadequate to estimate the delicate situation of daily physical activity.

DESCENTE SPORTS SCIENCE Vol.17/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE