STUDY ON THE SLOW RHYTHM FOUND IN THE PULSE AND RESPIRATION INTERVALS OF RABBITS : II. ON THE CHANGES OF THE SLOW RHYTHM INDUCED BY SOME EXPERIMENTAL TREATMENTS
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Slow rhythms of pulse and respiration intervals of rabbits that are administered drugs and treated by experimental operations were detected ; examination was made of the characteristics and occurrences of slow rhythms. 1. Correlation figure of average pulse intervals and standard deviation of the intervals showed a tendency that better regulation was performed within shorter intervals and worse in longer intervals in untreated prone position rabbits. 2. Two term components which seemed to reflect the regulation function of each respiration interval, occurred with high frequency under conditions of supine position, trans-π-oxocamphor, and strychnine nitrate administration and acute experimental anemia. The frequency was low in chlorpromazine administration. 3. Pulse and respiration slow rhythms could occur without the nerve centers higher than the upper colliculi of Corpora quadrigemina. 4. In the untreated supine position, slow rhythms of pulse and respiration intervals showed a tendency for the longer period component to disappear or for the shorter period component to occur, and shorter period and relatively regular slow rhythms became marked. 5. In chlorpromazine administration, there was a tendency for the relatively regular slow rhythms to become apparent and for the longer period component to decrease in both pulse and respiration slow rhythms. 6. In trans-π-oxocamphor administered animals, there was a tendency for the number of components included in a series of pulse intervals to increase ; the distribution figure of the period was divided into two groups separating at the point of about 15 sec., and 50 terms. 7. In urethane administered animals, there was a tendency for the shorter period component of pulse intervals to show a marked decrease. No slow rhythm could be detected on the correlogram of original series of pulse and respiration intervals. 8. Significant correlations between pulse number corresponding to a single respiration and period of slow rhythm was recognized in both pulse and respiration. 9. When pulse and respiration slow rhythms are detected simultaneously, the significant correlation between the two corresponding slow rhythms was recognized. About half of the two periods was nearly equal. From this fact, it can be supposed that there exists a close connection between the regulation mechanism of respiration and pulse intervals. 10. Some considerations on the occurrence mechanism of slow rhythms found in pulse and respiration intervals were discussed ; it can be expected that the reticular formation situated between medulla oblongata and pons contributes to the genesis of slow rhythms.
- 北海道大学の論文
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関連論文
- STUDY ON THE SLOW RHYTHM FOUND IN THE PULSE AND RESPIRATION INTERVALS OF RABBITS : II. ON THE CHANGES OF THE SLOW RHYTHM INDUCED BY SOME EXPERIMENTAL TREATMENTS
- STUDY ON THE SLOW RHYTHM FOUND IN THE PULSE AND RESPIRATION INTERVALS OF RABBITS : I. ON THE METHOD OF ANALYSIS AND THE MAINTENANCE OF THE SLOW RHYTHM