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[Transitional modes in the work of the external respiratory system under physical loading].

When recording the respiratory volume (RV) in the course of a 5-minute muscular work, two types of transitory processes were revealed: an aperiodic and an oscillatory ones. The former characterises the matrix optimal way of adaptation to physical work. The latter occurs of loads in a moderate intensity. The RV fluctuations seem to reflect a "search" for the RV optimal level for a given lung ventilation. The reserve volume of expiration practically does not participate in the RV increase, thus maintaining a large enough functional residual capacity in physical load.