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P wave changes in body surface potential maps due to increasing heart rate during exercise in normals
Y Watanabe1, Y Kohgame, H Nakano
1Department of Internal Medicine, Fujita-Gakuen Health University School of Medicine, Aichi, Japan.
Japanese Circulation Journal
|April 1, 1988
Summary
Exercise alters P-wave maps, showing increased peak voltage and decreased duration with higher heart rates. These changes, influenced by sympathetic nerve activity, help understand heart conditions during physical exertion.
Area of Science:
- Cardiology
- Physiology
Background:
- Understanding exercise-induced cardiac electrical activity changes is crucial for diagnosing heart conditions.
- P-wave maps offer insights into atrial electrical patterns during physiological stress.
Purpose of the Study:
- To investigate exercise-induced alterations in P-wave maps in healthy individuals.
- To establish baseline changes for comparison in patients with ischemic heart disease or left ventricular dysfunction.
Main Methods:
- Utilized an 87-lead point system (HPM-6500) to record P-wave maps.
- Subjects underwent graded bicycle ergometric exercise, with maps recorded at rest and incrementally up to 140 bpm.
- P-waves were analyzed in three phases (initial, middle, terminal) to characterize potential distribution patterns.
Main Results:
- Peak P-wave voltages increased proportionally with heart rate.
- P-wave duration decreased as heart rate increased.
- Two distinct patterns (Type A and Type B) of P-wave map changes were observed, potentially related to individual physiological responses.
Conclusions:
- Exercise significantly alters P-wave map characteristics, primarily due to increased heart rate and sympathetic nerve activation.
- Observed patterns suggest individual variations in pulmonary volume and sympathetic influence on atrial activity.
- These findings provide a baseline for interpreting exercise-induced P-wave map changes in cardiac patient populations.