ventilatory equivalent

ventilatory equivalent

describes the ratio of ventilation (minute volume) to oxygen intake, or to carbon dioxide output. For oxygen, the volume of gas breathed out (and in) in litres per minute (ventilation, E) divided by the oxygen consumption in litres per minute (O2) over the same period: an index of the efficiency of oxygen uptake in the lungs. When there is significant anaerobic metabolism, decrease in blood pH is countered by stimulation of ventilation to increase CO2 excretion, such that E increases at a higher rate than O2, raising the ventilatory equivalent (for CO2 the ventilatory equivalent, E/CO2, increases in this instance less than that for O2 because as CO2 in the blood and lungs decreases, the same output is achieved by a smaller expired volume).
References in periodicals archive ?
Ventilatory threshold (Vt) was determined using the criteria of an increase in the ventilatory equivalent for oxygen (VE V[O.
41) Determination of anaerobic threshold (AT) was based on the ventilatory equivalent method.
Additional differences in gas exchange indices on CPET observed between Subjects 1 and 2 included oxygen pulse and ventilatory equivalent for carbon dioxide (VE/VC[O.
At the point of AT, the O2 ventilatory equivalent rises and crosses the CO2 ventilatory equivalent ratio, indicating the onset of metabolic acidosis or AT.
A comparison of the effects of assist-control, SIMV, and SIMV with pressure support on ventilation, oxygen consumption, and ventilatory equivalent.
E]), and the ventilatory equivalent for oxygen increased in MCT- and VEH-treated rats 24 hr after IT or INH of ROFA and remained elevated 72 hr post-IT.
LabScribe2 software is capable of calculating many of the recorded metabolic parameters directly from the oxygen and carbon dioxide concentrations, lung volumes, and heart rates, including relative and absolute oxygen consumption (VO2), relative and absolute carbon dioxide consumption (VCO2), respiratory exchange ratio (RER), ventilatory equivalent (VE/VO2), expired minute ventilation (VE), metabolic equivalent (METS), and others.
E]), heart rate (HR), respiratory exchange ratio (RER), ventilatory equivalent for oxygen production (VE/[VO.
VT1 was determined as the point at which a loss of linearity occurred between oxygen uptake and carbon dioxide production, identified when the ventilatory equivalent for oxygen and end-tidal oxygen partial pressure curves reached their minimum values and began to systematically increase.
VT and RCT were defined using both v-slope and ventilatory equivalents.