[Dependence of the thoracic abdominal ratio of the respiration parameters on body positioning relative to the vector of gravity]. / Zavisimost' sootnoshenii torakal'nykh i abdominal'nykh sostavliaiushchikh parametrov dykhaniia ot polozheniia tela otnositel'no vektora gravitatsii.

Abdominal and thoracic functional reserves of respiration and level of their involvement in spontaneous breathing were investigated in 10 male volunteers aged 20 to 22 put in horizontal head-down (-7 degrees and -30 degrees) or orthostatic (+70 degrees) position. The thoracic-abdominal functional reserves of respiration dependent on the spatial positioning of the body were found to be the factor that determines magnitude of contribution of the thorax and diaphragm in the breathing volume.

[Comparative analysis of responses of the thoracic and abdominal respiration components to hypercapnia and muscular work]. / Sravnitel'nyi analiz reaktsii torakal'nogo i abdominal'nogo komponentov dykhaniia na giperkapniiu i myshechnuiu rabotu.

The ratio of thoracic and abdominal contribution to ventilatory responses to hypercapnia in humans was found to depend on the initial ratio of thoracic and abdominal breathing reserves as determined by the body position in space. In muscular work, participation of the respiratory muscles in locomotor loads becomes a factor affecting the ratio of thoracic and abdominal components of ventilatory response.

[The characteristics of the reactions of the abdominal and thoracic components in respiration to progressive hypercapnia]. / Osobennosti reaktsii briushnoho i grudnogo komponentov dykhaniia na progressiruiushchuiu giperkapniiu.

The total, abdominal and thoracic pneumograms were recorded at resting and in the course of progressing hypercapnia in humans. At the initial stage, the quantitative contribution of either abdominal or thoracic components to the breathing volume was rather individualised.

[The dynamic function of the motor apparatus of the respiratory system during maximal voluntary hyperventilation under hypoxia and hypercapnia]. / Dinamika funktsional'nogo sostoianiia motornogo apparata sistemy dykhaniia v protsesse maksimal'noi proizvol'noi giperventiliatsii v usloviiakh gipoksii i giperkapnii.

The working ability in the course of hyperventilation can be divided into three stages: the adaptation, stable working ability, the fatigue. Hypoxia decreased the duration and intensity of voluntary hyperventilation. During hypercapnia, the hyperventilation is more intensive and shorter. The data obtained suggest a co-operation of one's own will and chemoreceptor stimuli under hypoxia and hypercapnia.

[The control of respiratory volume by instrumental feedback under hypoxia and hypercapnia in rats]. / Upravlenie dykhatel'nym ob''emom posredstvom instrumental'noi obratnoi sviazi v usloviiakh gipoksii i giperkapnii u krys.

The biofeedback was used in the training of rats to decrease their spontaneous tidal volume in conditions of normoxia, hypoxia and hypercapnia. All rats decreased tidal volume in the ranges equal to 1.0 VT and 0.8 VT in the air and hypoxic conditions. It was difficult for them to decrease tidal volume in hypercapnia. The role of hypoxic and hypercapnic drives in respiratory responses to a breathing regimen and its abolition, is discussed.

[Features of the respiration of the rat at a given tidal volume]. / Osobennosti dykhaniia krys v usloviiakh zadannogo dykhatel'nogo ob"ema.

Intact rats were trained to breathe in a given tidal volume equal to VT; 0.8 VT; 0.6 VT; 0.4 VT. To decrease their spontaneous tidal volume rats were automatically punished with electric current for exceeding the given volume. All rats could breathe in the ranges VT and 0.8 VT maintaining the obligatory level of lung ventilation. It was difficult for them to breathe in the ranges 0.6 VT and 0.4 VT. In these cases the lung ventilation was lower than the obligatory one and the breathing was interrupted with hyperpnoea. Rats respiratory reactions depend on the range of the restriction. Three types of respiratory responses to the tidal volume restriction were found. The ability of rats to breathe in given ranges of the restriction are discussed.

[Characteristics of temporal and spatial parameters of voluntary (set) human respiratory movements under conditions of chemorecptor stimulation of different character]. / Kharakteristika vremennykh i prostranstvennykh parametrov proizvol'nykh (zadannykh) dykhatel'nykh dvizhenii cheloveka v usloviiakh khemoretseptornoi stimuliatsii razlichnogo kharaktera

Dynamics of temporal and spacial parameters of set respiratory movements (in comparison with the movements of the hand) under conditions of progressive hypoxia, hypercapnia, hypoxic-hypercapnic interaction was investigated in 10 men aged from 19 to 30 years. Hypercapnia (especially in combination with hypoxia) is a specific factor preventing voluntary control of the respiratory movements. The certitude (exaggeration of the set respiratory volume) and the capacity to correction of the respiratory movements are mostly influenced by these factors. These facts are considered to be the result of chemoceptor stimulation of the respiratory center (imperative stimulus).