Cardiovagal response to acute mild exercise in young healthy subjects

Grzegorz Raczak, Gian Domenico Pinna, Maria Teresa La Rovere, Roberto Maestri, Ludmiła Daniłowicz-Szymanowicz, Wojciech Ratkowski, Monika Figura-Chmielewska, Małgorzata Szwoch, Karolina Ambroch-Dorniak

Research output: Contribution to journalArticlepeer-review


Background: The aim of the present study was to investigate the effect of a single bout of mild exercise on autonomic nervous system activity in healthy subjects. Methods and Results: The study group comprised 18 healthy males, aged between 20 and 24 years, who had not been training regularly for the last 3 months. A supine recording of systolic arterial pressure (SAP) and RR interval and the administration of the phenylephrine test were performed at baseline and repeated after a 60-min recovery period following treadmill exercise training for 30 min at 65% of maximal heart rate. Mean SAP and RR interval, heart rate variability (HRV) indices (the standard deviation of normal-to-normal RR intervals (SDNN), the square root of the mean of squared differences between successive intervals and the percentage of adjacent RR intervals differing more than 50 ms), noninvasive spectral baroreflex sensitivity (Spe-BRS) and phenylephrine baroreflex sensitivity (Phe-BRS) were assessed before and after training. Mean SAP measured after exercise was lower than baseline (120±12mmHg vs 128±12mmHg, p=0.05). Spe-BRS and Phe-BRS increased significantly after exercise, from 11.8±6.1ms/mmHg to 16.0±7.8ms/mmHg (p=0.034), and from 16.0±8.8ms/mmHg to 21.9±9.3 ms/mmHg (p=0.022), respectively. A parallel increase was also observed in SDNN (from 81±44 ms to 96±53ms, p=0.02), but the other HRV indices showed no significant differences between pre- and post-exercise. Conclusions: A single session of mild exercise performed by sedentary young men leads to significant autonomic nervous system improvement, which suggests that even mild physical activity is beneficial for neural cardiac regulation and should be recommended to sedentary healthy subjects.

Original languageEnglish
Pages (from-to)976-980
Number of pages5
JournalCirculation Journal
Issue number8
Publication statusPublished - 2005


  • Baroreflex sensitivity
  • Heart rate variability
  • Mild physical exercise

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology


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