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Exercise tolerance in rats with aortic stenosis and ventricular diastolic and/or systolic dysfunction.

Abstract：

BACKGROUND:Physical stress tolerance (ST) is a measurement of cardiorespiratory fitness. Aerobic capacity is reduced in heart failure (HF) although there is no data available on this parameter in animals with ventricular dysfunction and no signs of HF. OBJECTIVE:Evaluate ST in rats with ventricular diastolic dysfunction isolated or associated with systolic dysfunction induced by ascending aortic stenosis (AoS). METHODS:Young male Wistar rats (20-30 days old), divided in: control group (CG, n=11) and AoSG group, (n=12). Animals were assessed at 6 and 18 weeks after AoS surgery. Treadmill exercise test was until exhaustion and evaluated treadmill speed and lactate concentration [LAC] at lactate threshold, treadmill speed and [LAC] at exhaustion, and total testing time. RESULTS:Echocardiography data revealed remodeling of the left atrium and left ventricular concentric hypertrophy at 6 and 18 weeks. Endocardial fractional shortening was greater in AoSG than CG at 6 and 18 weeks. Midwall fractional shortening was greater in AoSG than in CG only 6 week. Cardiac index was similar in CG and AoSG at 6 and 18 weeks and decreased between from 6 to 18 weeks in both groups. The E wave to A wave ratio was greater in CG than in AoSG at both periods and did not change in both groups between week 6 and 18. Treadmill stress testing parameters were similar in both groups at 6 or 18 weeks. CONCLUSION:Although AoS promotes isolated diastolic dysfunction or associated with systolic dysfunction at 6 or 18 weeks, it is not sufficient to modify physical stress tolerance.

journal_name

Arq Bras Cardiol

journal_title

Arquivos brasileiros de cardiologia

authors

Mendes OC,Sugizaki MM,Campos DS,Damatto RL,Leopoldo AS,Lima-Leopoldo AP,Baldissera V,Padovani CR,Okoshi K,Cicogna AC

doi

10.1590/s0066-782x2012005000112

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

44-51

issue

1

eissn

0066-782X

issn

1678-4170

pii

S0066-782X2012005000112

journal_volume

100

pub_type

杂志文章

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