[1] Univ Colorado, Dept Kinesiol & Appl Physiol, Human Cardiovasc Res Lab, Boulder, CO 80309 USA
[2] Univ Colorado, Hlth Sci Ctr, Dept Med, Div Cardiol, Denver, CO 80262 USA
[3] Univ Colorado, Hlth Sci Ctr, Dept Med, Div Geriatr Med, Denver, CO 80262 USA