Document Detail


Cardiovascular effects of 1 year of progressive and vigorous exercise training in previously sedentary individuals older than 65 years of age.
MedLine Citation:
PMID:  20956204     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Healthy but sedentary aging leads to cardiovascular stiffening, whereas life-long endurance training preserves left ventricular (LV) compliance. However, it is unknown whether exercise training started later in life can reverse the effects of sedentary behavior on the heart.
METHODS AND RESULTS: Twelve sedentary seniors and 12 Masters athletes were thoroughly screened for comorbidities. Subjects underwent invasive hemodynamic measurements with pulmonary artery catheterization to define Starling and LV pressure-volume curves; secondary functional outcomes included Doppler echocardiography, magnetic resonance imaging assessment of cardiac morphology, arterial stiffness (total aortic compliance and arterial elastance), and maximal exercise testing. Nine of 12 sedentary seniors (70.6±3 years; 6 male, 3 female) completed 1 year of endurance training followed by repeat measurements. Pulmonary capillary wedge pressures and LV end-diastolic volumes were measured at baseline, during decreased cardiac filling with lower-body negative pressure, and increased filling with saline infusion. LV compliance was assessed by the slope of the pressure-volume curve. Before training, Vo(2)max, LV mass, LV end-diastolic volume, and stroke volume were significantly smaller and the LV was less compliant in sedentary seniors than Masters athletes. One year of exercise training had little effect on cardiac compliance. However, it reduced arterial elastance and improved Vo(2)max by 19% (22.8±3.4 versus 27.2±4.3 mL/kg/mL; P<0.001). LV mass increased (10%, 64.5±7.9 versus 71.2±12.3 g/m(2); P=0.037) with no change in the mass-volume ratio.
CONCLUSIONS: Although 1 year of vigorous exercise training did not appear to favorably reverse cardiac stiffening in sedentary seniors, it nonetheless induced physiological LV remodeling and imparted favorable effects on arterial function and aerobic exercise capacity.
Authors:
Naoki Fujimoto; Anand Prasad; Jeffrey L Hastings; Armin Arbab-Zadeh; Paul S Bhella; Shigeki Shibata; Dean Palmer; Benjamin D Levine
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2010-10-18
Journal Detail:
Title:  Circulation     Volume:  122     ISSN:  1524-4539     ISO Abbreviation:  Circulation     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-02     Completed Date:  2010-12-02     Revised Date:  2013-08-22    
Medline Journal Info:
Nlm Unique ID:  0147763     Medline TA:  Circulation     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1797-805     Citation Subset:  AIM; IM    
Affiliation:
Institute for Exercise and Environmental Medicine, Dallas, TX 75231, USA.
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MeSH Terms
Descriptor/Qualifier:
Aged
Aging / physiology*
Athletes*
Cardiovascular Physiological Phenomena*
Echocardiography, Doppler
Exercise / physiology*
Female
Heart Ventricles / anatomy & histology,  ultrasonography
Hemodynamics / physiology
Humans
Longitudinal Studies
Magnetic Resonance Imaging
Male
Middle Aged
Oxygen Consumption / physiology
Physical Endurance / physiology*
Sedentary Lifestyle*
Vascular Resistance / physiology
Ventricular Function, Left / physiology
Grant Support
ID/Acronym/Agency:
AG17479-02/AG/NIA NIH HHS; R01 AG017479/AG/NIA NIH HHS
Comments/Corrections

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