Exercise training attenuates age-associated diastolic dysfunction in rats
Summary
This summary is machine-generated.Exercise training can reverse age-related declines in cardiac diastolic function in rats. This suggests that deconditioning, not intrinsic aging, drives these changes, highlighting the benefits of physical activity for heart health.
Area Of Science
- Cardiovascular Physiology
- Aging Research
- Exercise Science
Background
- Diastolic function declines with age, unlike systolic function.
- Age-related changes in cardiac diastolic function are not fully understood.
- Investigating reversibility of age-associated diastolic dysfunction is crucial.
Purpose Of The Study
- To determine if exercise training can reverse age-associated declines in cardiac diastolic function.
- To compare diastolic function between adult and old rats.
- To assess the impact of exercise on left ventricular (LV) filling, compliance, and ischemia-induced stiffening.
Main Methods
- Adult (6-month) and old (24-month) Fischer 344/BNF1 rats were subjected to 12 weeks of treadmill training or sedentary conditions.
- Diastolic function assessed via Doppler echocardiography for LV filling.
- Isolated, perfused hearts used to measure LV passive compliance and response to ischemia.
Main Results
- Old rats exhibited lower exercise capacity and impaired LV relaxation compared to adults.
- Treadmill training significantly increased exercise capacity in both age groups.
- Training normalized echocardiographic indices of LV relaxation in old rats to adult levels.
- Age did not affect LV stiffness in isolated hearts, but old hearts stiffened more during ischemia.
- Exercise training eliminated the age-associated difference in ischemia-induced LV stiffening.
Conclusions
- Age-associated changes in cardiac diastolic function in rats are partially reversible with exercise training.
- These findings suggest that deconditioning contributes significantly to age-related diastolic dysfunction.
- Exercise interventions may be effective in mitigating age-related cardiovascular decline.
View abstract on PubMed