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Related Experiment Video

Updated: May 12, 2026

Getting to Compliance in Forced Exercise in Rodents: A Critical Standard to Evaluate Exercise Impact in Aging-related Disorders and Disease
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Exercise training attenuates age-associated diastolic dysfunction in rats.

D A Brenner1, C S Apstein, K W Saupe

  • 1Cardiac Muscle Research Laboratory, Boston University School of Medicine, Boston, MA 02118, USA.

Circulation
|July 12, 2001
PubMed
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.

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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-related declines in cardiac diastolic function.
  • To compare diastolic function in adult and old rats.
  • To assess the impact of exercise on left ventricular (LV) filling, compliance, and ischemia response.

Main Methods:

  • Studied adult (6-month) and old (24-month) Fischer 344/BNF1 rats.
  • Groups underwent 12 weeks of treadmill training or remained sedentary.
  • Assessed LV filling (echocardiography), passive compliance, and ischemia-induced stiffening.

Main Results:

  • Old rats had lower exercise capacity and impaired LV relaxation compared to adults.
  • Treadmill training significantly improved exercise capacity in both age groups.
  • Training normalized LV relaxation indices in old rats to adult levels.
  • Age did not affect LV passive compliance, but old hearts stiffened more during ischemia.
  • Training eliminated the age-associated difference in ischemia-induced LV stiffening.

Conclusions:

  • Some age-associated changes in rat diastolic function are reversible with exercise.
  • These findings suggest deconditioning, rather than intrinsic aging, contributes to diastolic dysfunction.
  • Exercise training may mitigate detrimental effects of aging on cardiac diastolic function.