Does cardiorespiratory synchronization show competitive aspect of cardiorespiratory modulation?

• Saitoh Tsuyoshi

  Bio-System Eng. Fac. Eng. Yamagata Univ. Yonezawa, Japan

• Nishidate Izumi

  Bio-System Eng. Fac. Eng. Yamagata Univ. Yonezawa, Japan

• Niizeki Kyuichi

  Bio-System Eng. Fac. Eng. Yamagata Univ. Yonezawa, Japan

Bibliographic Information

Other Title

• 心拍呼吸リズム間のsynchronizationとmodulationは競合関係か？

Abstract

Respiratory modulation of the heart rate (i.e.,respiratory sinus arrhythmia:RSA) and phase synchronization of respiratory and cardiac rhythms are manifestation of cardiorespiratory coordination. However, the question of whether they represent two competing entities of interaction remains unresolved. The present study was designed to characterize the synchronization and modulation between patterns of breathing and RSA during normoxia and hypoxia under resting condition. For this purpose, we recorded ventilation and electrocardiogram in 9 subjects while breathing was paced either 6,8,10, or 12 breaths/min for 5 min each. The instantaneous phases were calculated for RSA curve and respiratory patterns using Hilbert transform and then relative phase differences were obtained. The cardiorespiratory synchronization and modulation were quantified by the index based on conditional probability of the phase difference and by the amplitude of RSA power calculated using a fast Fourier transform, respectively. The synchronization index decreased significantly at 12 breath/min compared with that observed at lower breathing frequency, while the modulation index (i.e., RSA power) decreased almost linearly with increasing breathing frequency. There was a significant positive correlation between the indexes of the synchronization and modulation (p<0.01). The observed relation was not altered by hypoxia, suggesting that the coordination may not depend on functional modulations. Our analysis indicates that the cardiorespiratory synchronization can coexist with the modulation. [J Physiol Sci. 2006;56 Suppl:S137]

Journal

• Proceedings of Annual Meeting of the Physiological Society of Japan

  Proceedings of Annual Meeting of the Physiological Society of Japan 2006 (0), 137-137, 2006

  PHYSIOLOGICAL SOCIETY OF JAPAN

Keywords

• bivariate data analysis
• cardiac-respiratory interaction
• paced breathing

Details

• CRID: 1390001205727153408
• NII Article ID: 130005448359
• DOI: 10.14849/psjproc.2006.0_137_3
• Data Source:
  • JaLC
  • CiNii Articles
• Abstract License Flag: Disallowed