Breathing pattern during CO2 inhalation obtained from motion of the chest and abdomen

Ventilation.

“…Positioning of the coils has to be accurate, to prevent any angular displacement which will alter the magnetic flux unpredictably in relation to linear displacement. A further problem is that movement and change of posture may markedly alter the output of the magnetometers (Gilbert, Auchincloss, Baule, Peppi & Long, 1971) which makes the method unsatisfactory for long-term monitoring such as during sleep.…”

The relation between tidal volume and inspiratory and expiratory times during steady‐state carbon dioxide inhalation in man

“…values of the coefficients of the fitted parabolas (eqn. (1) Long, 1971;Patrick & Howard, 1972;Freedman, Dalton, Holland & Patton, 1972). For the present results the relation was generally nearly linear or bilinear as described by Hey et al (1966) except that the part above the breakpoint usually showed a finite slope rather than being vertical.…”

“…In some subjects a single continuous curve could have been fitted to the FE, VT data (cf. Gilbert et al 1971) .…”

Thoracoabdominal motion during progressive isocapnic hypoxia in conscious man.

“…The respiratory muscle response to CO2 rebreathing as reflected by the excursions of rib-cage and abdomen-diaphragm compartments has been examined previously (Gilbert, Auchincloss, Baule, Peppi & Long, 1971;Pengelly, Tarshis & Rebuck, 1979; Coates, Desmond, Milic-Emili & Beaudry, 1981). The present study was undertaken to describe, in man, the respiratory muscle response to progressive hypoxia in terms of rib-cage and abdominal compartment contributions to tidal volume and to determine the effects on this response of subtle alterations of the mechanical load imposed by changes in posture.…”