Study on Breath-Holding Test.:(III) On the Training Effect of Breath-Holding.

概要

論文の詳細を見る
1. The breath-holding test was repeated every other day, and the training effect was followed up, determing breath-holding time, time for the commencement of intrathoracic respiration, expiration volume and gaseous composition of the alveolar air.<BR>2. Repeated performance of the breath-holding test caused prolongation of the breath-holding time. Its maximum development was reached by the 4th to 8th repetition to remain on the same level, even after the interruption of the training for 9 months.<BR>3. Time of commencement of the intrathoracic respiration remained on the same level from the first performance to the last, without significant change despite the training.<BR>4. It was revealed that there was a optimum quantity tsf the inspiratory volume for each subject to perform the intrathoracic respiration. Subjects appeared to learn in the course of the training to adjust his volume of inspiration directly before the test performance.<BR>5. Prolongation of the breath-holding time by training is attributable mostly to the increase of the volitional endurance duration of the intrathoracic respiration. During the earlier period the technical improvement contributes to the training effect. It is not clear whether there occurs a gradual decrease in the excitability of the respiratory centre.