Journal
JOURNALS OF GERONTOLOGY SERIES A-BIOLOGICAL SCIENCES AND MEDICAL SCIENCES
Volume 63, Issue 9, Pages 911-920Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/gerona/63.9.911
Keywords
Aging; Diastolic function; Growth hormone; Insulin-like growth factor-1; Treadmill training
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Funding
- Career Development Program
- National Institutes of Health [K08-AG026764-03]
- Paul Beeson award [AGR3718915]
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Whether the lusitropic potential of short-term exercise in aged rats is linked to an augmentation in the growth hormone/insulin-like growth factor-1 (GH/IGF-1) axis and an alteration in the cardiac renin angiotensin system (RAS) is unknown. Old (28-month-old) male, Fischer 344XBrown Norway rats were randomized to 4 weeks of GH supplementation (300 mu g subcutaneous, twice daily) or 4 weeks of treadmill running, or were used as sedentary controls. Six-month-old rats, sedentary or exercised, were used as young controls. Training improved exercise capacity in old animals. Exercise and GH attenuated age-related declines in myocardial relaxation despite all exercise-induced suppression of IGF-1. The regulatory protein, sarcoplasmic Ca(2+) adenosine triphosphatase (SERCA2), increased with exercise but not GH. Among aged rats, the cardiac RAS was not altered by training or GH. Thus, the signaling pathway underlying the lusitropic benefit of short-term habitual exercise in the aged rat may be distinct from GH-mediated benefits and independent of the cardiac RAS.
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