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ENDURANCE TRAINING ATTENUATES CARDIOVASCULAR DRIFT AT THE SAME ABSOLUTE WORK RATE
Author(s) -
Kearney Matthew L,
Fogelman Amy E,
Kuipers Nathan T,
Ray Chester A
Publication year - 2007
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.21.6.a931-d
Subject(s) - heart rate , medicine , endurance training , blood pressure , cardiology , heart rate variability , mean arterial pressure , anesthesia
Animal studies report decreases in heart rate (HR) drift after endurance training. We tested the hypothesis that endurance training would attenuate HR drift via greater cardiac vagal activity. HR and arterial blood pressure were measured in thirteen healthy young subjects (25±1 yr) during rest and 40 min of cycling at the same work rate (50% of pretraining VO 2peak ) before and after 8‐weeks of endurance training. VO 2peak increased 17±3% after training (p < 0.01). Standard deviation of the R‐R interval (SDNN) and high frequency power (HF) were calculated from ECG. HR was lower at rest and throughout prolonged exercise after training (p < 0.01). There was a significant interaction of HR responses to exercise with training (p < 0.01) with HR drift greater before training (Δ9±2 vs. Δ4±2 bpm; p < 0.01). HR variability showed an increase in SDNN (Δ0.29 ms 2 ; p < 0.01) and greater HF after training (Δ1.20 ms 2 ; p < 0.01). Mean arterial pressure decreased less during exercise after training (Δ15 mmHg vs. 5 mmHg; p = 0.04). These results indicate that endurance training attenuates HR drift during prolonged exercise in humans by greater parasympathetic tone. NIH DC006459 , HL077670 , and MO1RR10732