breathing reserve

breath·ing re·serve

the difference between the pulmonary ventilation (that is, the volume of air breathed under ordinary resting conditions) and the maximum breathing capacity.

breath·ing re·serve

(brēdh'ing rē-zĕrv')
The difference between the pulmonary ventilation (i.e., the volume of air breathed under ordinary resting conditions) and the maximum breathing capacity.
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References in periodicals archive ?
The breathing reserve was calculated by subtracting the peak VE of maximum voluntary ventilation (MVV) estimated by age and gender of the participants (14).
Furthermore, the EG presented increased breathing reserve (i.e., lower BRI) at the end of CPET.
In addition to reduced peak V[O.sub.2] and AT, the exposed workers also showed significant worsening in ventilatory equivalent of C[O.sub.2] (VE/VC[O.sub.2]) at AT and in the breathing reserve. These results indicate worse cardiorespiratory fitness associated with poor ventilatory efficiency in exposed participants.
CG: control group (not exposed); EG: exposed group; VE: minute ventilation; V[O.sub.2]: oxygen uptake; VC[O.sub.2]: carbon dioxide production; BRI: breathing reserve index; VT: tidal volume; f: respiratory rate; HR: heart rate; PetC[O.sub.2]: end-expiratory pressure of C[O.sub.2]; Peto[O.sub.2]: end-expiratory pressure of [O.sub.2]; AT: anaerobic threshold, [DELTA]HR/[DELTA]V[O.sub.2]: cardiac efficiency; [DELTA]VE/[DELTA]VC[O.sub.2]: ventilatory efficiency; [DELTA]VT/[DELTA]lnVE: breathing pattern.
Simple evaluation of the [V.sub.E]max may not reveal the true cause of ventilatory limitation because there is often an adequate breathing reserve.
In patients with COPD, a reduced peak oxygen uptake (peak V[O.sub.2]) and a low breathing reserve have been identifled as the main contributors that limit exercise (11-13).
Breathing reserve was calculated as the difference between the maximum voluntary ventilation (MVV) at rest and the peak minute ventilation (VE) and was reported as a percentage of MVV [1 - (VE/MVV) x 100] (23).
The associations between the variables peak V[O.sub.2], breathing reserve, CAT, SF36 PCS, SF 36 MCS, and SGRQ with demographic, clinical and resting lung function variables were analyzed using Pearson correlation coefficients.
Forward stepwise regression analysis was used to identify the resting lung function parameters (spirometry, body plethysmography and [N.sub.2]SBW test) and possible confounders (demographic and clinical data) that were independently related to performance during the CPET (peak V[O.sub.2] and breathing reserve) and HRQoL (CAT, SF36 PCS, SF 36 MCS, and SGRQ).
Another method of expressing this is to calculate the 'breathing reserve' as 1.00 - [V.sub.E]max /MVV (usually reported as a %).
Nourry measured the breathing reserve in trained and untrained children and found, paradoxically, that while trained, sportive participants were breathing at higher lung volumes.
Another method of expressing this is to calculate the 'breathing reserve' as 1.00--[V.sub.E]max /MVV (usually reported as a %).