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Related Experiment Videos

Exercise training restores ischemic preconditioning in the aging heart.

P Abete1, C Calabrese, N Ferrara

  • 1Dipartimento di Medicina Clinica, Scienze Cardiovascolari ed Immunologiche--Cattedra di Geriatria, Facoltà di Medicina e Chirurgia, Università degli Studi di Napoli Federico II, Naples, Italy. p.abete@cds.unina.it

Journal of the American College of Cardiology
|August 10, 2000
PubMed
Summary

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Exercise training can restore the protective effects of ischemic preconditioning in aging hearts by increasing norepinephrine release. This finding highlights a potential strategy to improve cardiac function in senescent hearts.

Area of Science:

  • Cardiovascular Physiology
  • Aging Research
  • Exercise Science

Background:

  • Ischemic preconditioning (IP) is less effective in aging hearts due to reduced cardiac norepinephrine release.
  • Exercise training is known to reverse age-related declines in norepinephrine production.

Purpose of the Study:

  • To investigate the impact of IP on cardiac function in adult and senescent rat hearts.
  • To determine if exercise training influences the efficacy of IP in senescent hearts.
  • To explore the role of norepinephrine release in mediating IP effects.

Main Methods:

  • Isolated perfused hearts from adult, sedentary senescent, and trained senescent rats were subjected to global ischemia and reperfusion.
  • Mechanical parameters were assessed to evaluate cardiac function post-ischemia.

Related Experiment Videos

  • Norepinephrine release was quantified using high-performance liquid chromatography.

    • Main Results:

    • IP significantly improved recovery of developed pressure in adult hearts.
    • The beneficial effect of IP on cardiac function was absent in sedentary senescent hearts but present in trained senescent hearts.
    • Norepinephrine release increased post-IP in adult and trained senescent hearts, but not in sedentary senescent hearts.
    • Reserpine-induced depletion of norepinephrine stores abolished IP effects in adult and trained senescent hearts.

    Conclusions:

    • IP effectively reduces postischemic dysfunction in adult and trained senescent hearts, correlating with increased norepinephrine release.
    • Exercise training appears to restore IP efficacy in senescent hearts by enhancing norepinephrine release.
    • Norepinephrine release is a critical mediator of IP's cardioprotective effects in both adult and trained senescent hearts.