Key result
Exercise temporarily decreases ECG T wave amplitude, followed by immediate post-exercise rebound in T amplitude.
Why the study?
Changes in the electrocardiographic T wave and ST segment during and after exercise in normal subjects are relevant to interpreting ECG exercise tests.
How does exercise alter the electrocardiographic T wave and ST segment in normal subjects?
How does exercise alter the electrocardiographic T wave and ST segment in normal subjects?
Normal physiological changes during and after exercise include a decrease in T wave amplitude during exercise followed by an increase and ST segment elevation immediately after, which is important for interpreting ECG exercise tests.
Exercise ECGs require accounting for normal T/ST recovery to avoid misclassification; leaves open sympathetic effects in disease states.
In normal subjects the electrocardiographic T wave decreases in amplitude during exercise. Immediately after exercise the T amplitude increases, and there is a rise in the ST segment and in its slope. These changes, which may be due to alterations of sympathetic tone, are relevant to the interpretation of ECG exercise tests.
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KITCHIN et al. (1972) studied this question. Exercise in normal subjects decreases ECG T wave amplitude, followed immediately after exercise by an increase in T amplitude and a rise in the ST segment and its slope.
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