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Outline of the experimental protocol. Test 1: serial sevens test; Test 2: hyperventilation; BP: blood pressure. Duration of ECG recording during the serial sevens test, hyperventilation and the three periods of rest was 256 RR intervals (approximately 3.6 min each). BP was measured at the end of each period of ECG recording. The Doppler diagnostics was not performed in the SHAM group.
