Fig. 2
From: Impaired chronotropic response to physical activities in heart failure patients
Correlation between heart rate and physical activities during daily living. a the correlation between heart rate (bpm, the ordinate) and the percentage of each maximal daily physical activity over the greatest maximal daily physical activity (the abscissa) in one patient; b the correlation for all 40 patients; c the correlation for 13 non-CI patients; d the correlation for 13 CI patients. Dashed line in (c and d) represents the maximal HR above 100 bpm during physical activity events