Characteristics of Human Sinus Arrhythmia During Apnea and Hyperventilation
【Supercategory：7. DESCENTE SPORTS SCIENCE Subcategory：7.6 Vol.6】
It is the purpose of this report to study the characteristics of human sinus rhythmical oscillation. Following experiments on connection between the respiratory movement and instantaneous heart rate were made.
1. A comparison of respiratory sinus arrhythmia at rest and during bicycle exercise with nonload.
2. Effect of breath holding on heart rate during bicycle exercise with various loads.
All data in this report were obtained using the ratio of two beats for inspiration followed by two beats for expiration by all adult subjects with no history of cardiopulmonary disease. The summary of the results is shown below.
1) The respiratory sinus arrhythmia amplitude at rest decreased along gradients of increasing the minimum heart rate on expiration.
2) The above curve of the respiratory sinus arrhythmia amplitude (vs. the minimum heart rate on expiration) shifted to the right when tidal volume was increased and when bicycle exercise with nonload was done.
3) Pco₂ accumulation by rebreathing increased level of respiratory center activity, and the curve of the respiratory sinus arrhythmia amplitude shifted to the right by multiple effects of stretching of lung and muscular exercise with nonload.
4) The curve of the respiratory sinus arrhythmia amplitude during hyperventilation and R-R interval coefficient of variation during inspiratory breath holding after hyperventilation were not influenced by muscular exercise with nonload.
5) The respiratory sinus arrhythmia amplitude during exercise was a constant value over the threshold heart rate level.
6) Decrease of heart rate during exercise was observed at the beginning of the inspiratory breath holding and immediately after breaking point of breath holding, and both falls of heart rate were inhibited along gradients of increasing the heart rate level.
These data of respiratory sinus arrhythmia and fall of the heart rate on breath holding during exercise will provide the oscillation of level of cardio-inhibitory center activity and the reserve of capacity in heart rate regulating system.
DESCENTE SPORTS SCIENCE Vol.6/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
1. A comparison of respiratory sinus arrhythmia at rest and during bicycle exercise with nonload.
2. Effect of breath holding on heart rate during bicycle exercise with various loads.
All data in this report were obtained using the ratio of two beats for inspiration followed by two beats for expiration by all adult subjects with no history of cardiopulmonary disease. The summary of the results is shown below.
1) The respiratory sinus arrhythmia amplitude at rest decreased along gradients of increasing the minimum heart rate on expiration.
2) The above curve of the respiratory sinus arrhythmia amplitude (vs. the minimum heart rate on expiration) shifted to the right when tidal volume was increased and when bicycle exercise with nonload was done.
3) Pco₂ accumulation by rebreathing increased level of respiratory center activity, and the curve of the respiratory sinus arrhythmia amplitude shifted to the right by multiple effects of stretching of lung and muscular exercise with nonload.
4) The curve of the respiratory sinus arrhythmia amplitude during hyperventilation and R-R interval coefficient of variation during inspiratory breath holding after hyperventilation were not influenced by muscular exercise with nonload.
5) The respiratory sinus arrhythmia amplitude during exercise was a constant value over the threshold heart rate level.
6) Decrease of heart rate during exercise was observed at the beginning of the inspiratory breath holding and immediately after breaking point of breath holding, and both falls of heart rate were inhibited along gradients of increasing the heart rate level.
These data of respiratory sinus arrhythmia and fall of the heart rate on breath holding during exercise will provide the oscillation of level of cardio-inhibitory center activity and the reserve of capacity in heart rate regulating system.
DESCENTE SPORTS SCIENCE Vol.6/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
| Researcher | Yasutaka Kobayashi |
|---|---|
| University or institution | Department of Physiology,The Jikei University School of Medicine |
Keywords
human sinus rhythmical oscillation, respiratory sinus arrhythmia amplitude, muscular exercise, hyperventilation, threshold heart rate level