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Exercise tolerance is reduced in bipolar illness.

Amy Shah1, Motaz Alshaher, Buddhadeb Dawn

  • 1Mood Disorders Research Program, Department of Psychiatry and Behavioral Sciences, University of Louisville School of Medicine, Louisville, Kentucky 40202, United States.

Journal of Affective Disorders
|April 20, 2007
PubMed
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Bipolar patients show reduced exercise tolerance but maintain normal heart function despite higher risks of cardiovascular disease. This study investigated cardiac responses to exercise in euthymic bipolar individuals.

Area of Science:

  • Cardiology
  • Psychiatry
  • Exercise Physiology

Background:

  • Bipolar disorder significantly increases cardiovascular and cerebrovascular disease risk.
  • Asymptomatic individuals with bipolar disorder often exhibit electrocardiogram abnormalities.
  • Understanding cardiac function in euthymic bipolar patients is crucial.

Purpose of the Study:

  • To assess the impact of exhaustive exercise on cardiac function in euthymic bipolar patients.
  • To compare exercise tolerance and cardiac responses between bipolar and control groups.

Main Methods:

  • Twenty-four untrained adults (14 bipolar type I, 10 controls) underwent maximal oxygen consumption treadmill tests.
  • Echocardiography (2D and Doppler) was performed pre- and post-exercise.

Related Experiment Videos

  • Exercise continued until physical exhaustion.

    • Main Results:

    • Bipolar subjects demonstrated significantly shorter exercise durations compared to controls (75.9 vs. 95.0 minutes).
    • No significant differences in resting or post-exercise echocardiographic variables were found between groups.
    • Reduced exercise tolerance in bipolar patients was observed.

    Conclusions:

    • Euthymic bipolar patients exhibit reduced exercise tolerance.
    • Despite reduced exercise tolerance, cardiac function remains normal in medically asymptomatic bipolar individuals.
    • Factors like smoking and weight may influence exercise capacity in bipolar disorder.