Abstract
Sinus rate and activity sensor rate during consecutive daily activities were recorded by the internal rate profile function of Intermedics DASH. Sensor rate profiles with different rate response parameters were redrawn by the redraw function of DASH without repeating exercise. As the result, sensor rate was under-responsive with lower-lebel exercise when rate response parameters were set for higher-lebel exercise, and was over-responsive with higher-lebel exercise when parameters were set for lower-lebel exercise. Time delay of rate response was noted with higher-lebel exercise following lower-lebel exercise in most of subjects. These phenomena were found both in DASH and Medtronic LEGENDII, suggesting limitation of activity sensor and rate response algorism. The rate profile and redraw functions were useful for evaluation of the rate responsive pacemakers.
