1. Chronotropic Incompetence by Peter H. Brubaker, and Dalane W. Kitzman Circulation Volume 123(9):1010-1020 March 8, 2011 Copyright © American Heart Association, Inc. All rights reserved.

2. Influence of parasympathetic tone on heart rate recovery. Peter H. Brubaker, and Dalane W. Kitzman Circulation. 2011;123:1010-1020 Copyright © American Heart Association, Inc. All rights reserved.

3. Relationship between age and maximal heart rate in >5000 asymptomatic women, with 95% confidence limits. Peter H. Brubaker, and Dalane W. Kitzman Circulation. 2011;123:1010-1020 Copyright © American Heart Association, Inc. All rights reserved.

4. There is a significant relationship between change in heart rate (HR) during exercise and V ̇ o2peak in patients (pts) with heart failure with reduced ejection fraction, but there is no significant difference in this relationship between those patients taking β-blockers and those not taking them. Peter H. Brubaker, and Dalane W. Kitzman Circulation. 2011;123:1010-1020 Copyright © American Heart Association, Inc. All rights reserved.

5. In patients with heart failure, β-blockers (BB) do not significantly impact the relationship between heart rate and exercise time, regardless of whether chronotropic incompetence (CI) is present. Peter H. Brubaker, and Dalane W. Kitzman Circulation. 2011;123:1010-1020 Copyright © American Heart Association, Inc. All rights reserved.

6. Markedly reduced survival during long-term follow-up among asymptomatic women with peak heart rate (HR) ≥1 standard deviation (SD) below average. Peter H. Brubaker, and Dalane W. Kitzman Circulation. 2011;123:1010-1020 Copyright © American Heart Association, Inc. All rights reserved.

7. Relationship of heart rate reserve (HRR) to peak exercise oxygen consumption (V ̇ o2peak) in older patients with heart failure with reduced ejection fraction and those with heart failure with preserved ejection fraction, with (○) and without (●) chronotropic incompetence (CI). Peter H. Brubaker, and Dalane W. Kitzman Circulation. 2011;123:1010-1020 Copyright © American Heart Association, Inc. All rights reserved.

8. Heart rate profiles during and after cycle ergometry in patients with heart failure with preserved ejection fraction (HFpEF) compared with age- and gender-matched subjects who possessed similar comorbidities to the HFpEF group, including left ventricular hypertrophy (control). Peter H. Brubaker, and Dalane W. Kitzman Circulation. 2011;123:1010-1020 Copyright © American Heart Association, Inc. All rights reserved.