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Related Concept Videos

Exercise and Cardiac Output01:17

Exercise and Cardiac Output

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Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
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Left atrial functional changes following short-term exercise training.

Steve Wright1, Sam Esfandiari, Nader Elmayergi

  • 1Faculty of Kinesiology and Physical Education, University of Toronto, 55 Harbord Street, Toronto, ON, Canada.

European Journal of Applied Physiology
|September 7, 2014
PubMed
Summary
This summary is machine-generated.

Short-term exercise training, including high-intensity interval training (HIT) and continuous moderate-intensity training (CMT), rapidly improves left atrial (LA) function in young men. These findings highlight the plasticity of atrial function in response to exercise.

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Area of Science:

  • Cardiovascular Physiology
  • Exercise Science
  • Cardiac Adaptations

Background:

  • Exercise-induced cardiac adaptations are well-documented for the left ventricle (LV).
  • Adaptations of the human atria, particularly early in training, remain understudied.
  • Understanding atrial function changes is crucial for a comprehensive view of exercise physiology.

Purpose of the Study:

  • To investigate the effects of short-term high-intensity interval training (HIT) and continuous moderate-intensity training (CMT) on left atrial (LA) systolic and diastolic function.
  • To compare these LA adaptations relative to left ventricular (LV) function.
  • To utilize speckle tracking echocardiography (STE) for precise functional assessment.

Main Methods:

  • Fourteen untrained young men were randomized to either HIT or CMT groups.
  • Training interventions comprised six sessions over a 12-day period.
  • HIT involved short, intense cycling intervals; CMT involved longer, moderate-intensity cycling.

Main Results:

  • Both HIT and CMT significantly increased maximal aerobic power (VO₂MAX) and plasma volume.
  • Resting LV volumes and ejection fraction remained unchanged post-training.
  • Significant improvements in LA systolic function, including peak atrial longitudinal strain and atrial systolic strain rate, were observed in both training groups.

Conclusions:

  • Left atrial (LA) function, assessed by speckle tracking echocardiography (STE), demonstrates rapid improvement.
  • Short-term, intensive exercise training effectively enhances atrial function.
  • These findings suggest significant atrial plasticity in response to exercise stimuli.