Document Detail

Exercise-induced myocardial capillary growth in the spontaneously hypertensive rat.
MedLine Citation:
PMID:  2931579     Owner:  NLM     Status:  MEDLINE    
Spontaneously hypertensive rats (SHR) were studied to test the hypothesis that endurance exercise training can stimulate capillary growth and offset the decrement associated with the development of myocardial hypertrophy. The exercise group (SHR-T) was trained on a treadmill for 10 weeks at 70-90% maximum VO2 and compared to nontrained SHR and normotensive Wistar-Kyoto (WKY) at 16 weeks of age. Thus, the training program coincided with the development of hypertension and hypertrophy in SHR. Image analysis was used to study capillaries in one micron thick left ventricular tissue samples from perfuse-fixed hearts. Training did not affect left ventricular mass or blood pressure, but reversed the characteristic decrements in capillary surface area (CSA), volume (CV), and numerical density (CD). CSA and CV were most markedly affected by exercise, as mean values for these parameters increased by 31 and 40%, respectively, compared to SHR. The magnitude of these changes approximated the magnitude of hypertrophy as evidenced by left ventricular weight/body weight ratios (42% in SHR and 37% in SHR-T). Anatomical intercapillary distance was also normalized by training (means +/- SEM): SHR-T, 11.65 +/- 0.31; SHR, 13.97 +/- 0.37; WKY, 11.19 +/- 0.37. These data indicate that exercise stimulates capillary growth in the face of developing hypertension and its related left ventricular hypertrophy.
R P Crisman; B Rittman; R J Tomanek
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Microvascular research     Volume:  30     ISSN:  0026-2862     ISO Abbreviation:  Microvasc. Res.     Publication Date:  1985 Sep 
Date Detail:
Created Date:  1985-11-14     Completed Date:  1985-11-14     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0165035     Medline TA:  Microvasc Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  185-94     Citation Subset:  IM    
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MeSH Terms
Body Weight
Capillaries / growth & development
Cardiomegaly / physiopathology
Coronary Vessels / growth & development*
Hypertension / physiopathology*
Physical Exertion*
Rats, Inbred SHR
Rats, Inbred WKY
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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