Heart failure is the scourge of the elderly accounting for nearly $35 billion dollars and causing substantial morbidity and mortality;~50% of all aged patients with CHF have heart failure with a preserved ejection fraction (HFpEF), a multi-factorial condition associated with several abnormalities in diastolic function. Stimulated by previous work from this research program the global objective of the next 5 years is to test novel strategies to prevent and reverse the impaired diastolic function associated with sedentary aging and HFpEF. These include: A) novel exercise training strategies implemented early enough in life while CV plasticity still exists;and B) pharmacologic probes of underlying pathophysiology targeted to improve relaxation in the elderly and HFpEF patients, and restore functional capacity.
The aims of the program are:
Specific Aim 1 : to test the hypothesis that exercise training implemented 4-5 times/week for 2 yrs in sedentary middle aged men and women (45-64yr) will improve cardiac and vascular compliance to a degree equivalent to life-long exercisers (and sedentary young). We will perform invasive and non-invasive assessment of cardiovascular structure and function before and after an exercise program involving high intensity aerobic intervals, lower intensity endurance and strength training or yoga control.
Specific Aim 2 : to test the hypothesis that the stiff, slowly relaxing heart of patients with HFpEF causes a marked elevation in pulmonary capillary pressure during exercise which leads to premature fatigue prior to achieving maximal HR, thus causing apparent """"""""chronotropic incompetence"""""""". We further hypothesize that both sedentary aged and HFpEF patients have slowed relaxation due to down regulation of SERCA2a activity, the putative cellular mechanism underlying age related impaired lusitropic function. We plan to perform 2 sets of experiments for this aim: 1) to measure the HR response to two separate interventions: a) maximal activation of central cardiovascular pathways (""""""""central command"""""""") from static handgrip at 40% maximal voluntary contraction to fatigue;b) incremental doses of isoproterenol in the face of ganglionic blockade to isolate ? adrenergic responsiveness without reflex compensation;and 2) to perform invasive and non-invasive assessment of cardiac function at rest and during exercise in patients with HFpEF compared to age matched and young controls: a) after infusion of istaroxime an experimental drug with prominent lusitropic properties due to its ability to upregulate SERCA2a activity;and b) after Na+/K+ ATPase inhibition control (digoxin). After these aims are accomplished, we will have established a novel, practical exercise training strategy designed to prevent the cardiovascular stiffening with aging, and ultimately to prevent HFpEF. Such a determination would have enormous public health significance since this condition is quite difficult to treat once established. In addition, we will use novel physiological and pharmacological probes to determine the mechanism of the apparent chronotropic incompetence and impaired exercise capacity in patients with HFpEF which has the potential to open up new therapeutic options for this challenging syndrome.

Public Health Relevance

This research seeks to prevent and reverse the deterioration in functional capacity with advancing age, both in healthy seniors &patients with diastolic heart failure. We will develop an optimized exercise program to preserve youthful cardiac structure, &will explore new strategies to improve relaxation of the aged heart.

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Research Project (R01)
Project #
2R01AG017479-10A1
Application #
8295169
Study Section
Clinical and Integrative Cardiovascular Sciences Study Section (CICS)
Program Officer
Hannah, Judy S
Project Start
2000-01-01
Project End
2017-06-30
Budget Start
2012-07-01
Budget End
2013-06-30
Support Year
10
Fiscal Year
2012
Total Cost
$596,216
Indirect Cost
$36,294
Name
University of Texas Sw Medical Center Dallas
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
800771545
City
Dallas
State
TX
Country
United States
Zip Code
75390
Howden, Erin J; Sarma, Satyam; Lawley, Justin S et al. (2018) Reversing the Cardiac Effects of Sedentary Aging in Middle Age-A Randomized Controlled Trial: Implications For Heart Failure Prevention. Circulation 137:1549-1560
Opondo, Mildred A; Aiad, Norman; Cain, Matthew A et al. (2018) Does High-Intensity Endurance Training Increase the Risk of Atrial Fibrillation? A Longitudinal Study of Left Atrial Structure and Function. Circ Arrhythm Electrophysiol 11:e005598
Oh, Young Jun; Pau, Vanessa C; Steppan, Jochen et al. (2017) Role of tissue transglutaminase in age-associated ventricular stiffness. Amino Acids 49:695-704
Abdullah, Shuaib M; Barkley, Kyler W; Bhella, Paul S et al. (2016) Lifelong Physical Activity Regardless of Dose Is Not Associated With Myocardial Fibrosis. Circ Cardiovasc Imaging 9:
Shafer, K M; Janssen, L; Carrick-Ranson, G et al. (2015) Cardiovascular response to exercise training in the systemic right ventricle of adults with transposition of the great arteries. J Physiol 593:2447-58
Howden, Erin J; Perhonen, Merja; Peshock, Ronald M et al. (2015) Females have a blunted cardiovascular response to one year of intensive supervised endurance training. J Appl Physiol (1985) 119:37-46
Carrick-Ranson, Graeme; Hastings, Jeffrey L; Bhella, Paul S et al. (2014) The effect of lifelong exercise dose on cardiovascular function during exercise. J Appl Physiol (1985) 116:736-45
Levine, Benjamin D (2014) Can intensive exercise harm the heart? The benefits of competitive endurance training for cardiovascular structure and function. Circulation 130:987-91
Arbab-Zadeh, Armin; Perhonen, Merja; Howden, Erin et al. (2014) Cardiac remodeling in response to 1 year of intensive endurance training. Circulation 130:2152-61
Best, Stuart A; Bivens, Tiffany B; Dean Palmer, M et al. (2014) Heart rate recovery after maximal exercise is blunted in hypertensive seniors. J Appl Physiol (1985) 117:1302-7

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