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Related Experiment Videos

Exercise training changes autonomic cardiovascular balance in mice.

K De Angelis1, R B Wichi, W R A Jesus

  • 1Hypertension Unit, Heart Institute University of São Paulo, Medical School, 05403-000 São Paulo, Brazil.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|January 20, 2004
PubMed
Summary

Dynamic exercise training in mice significantly lowered resting heart rate and improved baroreflex-mediated tachycardia. These cardiovascular adaptations suggest increased vagal and decreased sympathetic tone, mirroring human exercise responses.

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Area of Science:

  • Cardiovascular Physiology
  • Exercise Science
  • Autonomic Neuroscience

Background:

  • Regular exercise training impacts cardiovascular function.
  • Understanding autonomic control adaptations to exercise is crucial for human health.
  • Mice models offer insights into exercise physiology.

Purpose of the Study:

  • To investigate the effects of dynamic exercise training on cardiovascular function in mice.
  • To assess changes in heart rate, arterial pressure, baroreflex sensitivity, and autonomic control.
  • To compare these adaptations between trained and sedentary mice.

Main Methods:

  • Male C57/6J mice underwent a 4-week treadmill exercise protocol.
  • Measurements included heart rate, mean arterial pressure, and baroreflex sensitivity.

Related Experiment Videos

  • Autonomic control was assessed using pharmacological agents (methylatropine, propranolol).

    • Main Results:

    • Trained mice exhibited resting bradycardia (lower heart rate) compared to sedentary mice.
    • Baroreflex-mediated tachycardia was significantly enhanced in trained mice.
    • Increased vagal tone and decreased sympathetic tone were inferred from drug responses.

    Conclusions:

    • Dynamic exercise training induces resting bradycardia and enhances baroreflex-mediated tachycardia in mice.
    • These findings suggest a shift towards increased parasympathetic (vagal) and decreased sympathetic nervous system activity.
    • The observed cardiovascular adaptations in mice resemble those seen in human exercise responses.