<原著>粘性抵抗負荷の換気力学的研究 : 呼吸タイプの変化に関する一考察

Abstract

The changes of tidal volume, minute ventilation and viscous work per tidal volume and unit ventilation were measured in awaking subjects with a spirometer in which artificial viscous resistance was built in. The respiratory frequency of the subjects was paced by a metronome at various preset rates. The results showed that both V_T and V_E were influenced less by the addition of artificial viscous resistance at low respiratory frequencies. The calculation of viscous work showed that the addition of viscous resistance caused a lowering of mechanical respiratory efficiency in all studies. Viscous work per unit ventilation was minimum at a respiratory rate of 10, which was therefore considered the "optimal rate of breathing" in human beings. Measurement of viscous work also showed that viscous respiratory efficiency decreased during hyperventilation induced by exercise.