التفاصيل البيبلوغرافية
| العنوان: |
Phase-sensitive interaction of cardiac and respiratory timing in humans. |
| المؤلفون: |
Jennings, J. Richard1 injenn@vms.cis.pitt.edu, McKnight, J. Daniel1, Van Der Molen, Maurits2 |
| المصدر: |
Psychophysiology. Sep1996, Vol. 33 Issue 5, p514-521. 8p. |
| مصطلحات موضوعية: |
*RESPIRATION, *HEART beat, *HEMODYNAMICS, *ARRHYTHMIA, *HEART diseases, *PHYSIOLOGY |
| مستخلص: |
We asked whether the heart rate response to respiratory change varied as a function of timing within the cardiac cycle. Respiratory and electrocardiographic data were collected from seven men and seven women during three weekly sessions under conditions of normal and visually paced breathing. Results revealed that, when inspiration began sooner than 500 ms before the subsequent heart beat, inspiration had little effect on the subsequent inter- beat interval. However, the timing of the subsequent beat was accelerated when inspiration began later than 450 ms before this heart beat. Similar relationships were observed for expiratory onset. Results were not attributable to volitional control or rate of breathing. The modulation of respiratory sinus arrhythmia by the timing of respiratory events in the cardiac cycle has implications for the role of vagal control in the synchronization of heart rate with respiratory and behavioral actions. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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