Lung function results (n=36) Lung function parameters Median Interquartile range Forced expiratory volume 1.44 1.19-1.73 in one second (L) Forced vital capacity 1.83 1.44-2.09 (L) Forced expiratory volume 68.80 53.58-83.20 in one second (best/predicted %) Forced vital capacity 70.50 53.60-83.20 (best/predicted %) Forced expiratory volume 84.00 78.03-86.60 in one second/forced vital capacity Peak expiratory flow 64.30 45.3-95.3 rate (best/predicted %) Residual volume 104.00 67.8-130.9 (best/predicted %) Total lung capacity
80.90 62.50-90.50 (best/predicted %) Transfer factor of the 13.85 mmol/min/kPa 3.89-23.00 lung for carbon monoxide Transfer factor of the 32.50 mmol/min/kPa/L 22.75-45.00 lung for carbon monoxide divided by alveolar volume Table 7.
Transplantation Using Predicted Total Lung Capacity
, 20 Eur.
A study of girl swimmers (n=5), Courteix et al  also found a significant difference in VC and total lung capacity
(TLC) following one year of intensive training, compared to controls.
Variables (n) (mean [+ or -] SD) Age, year (n = 25) 67.5 ([+ or -]8.3) Gender (M/F) 17/8 Ex-smoker (n) % 13 (52%) Non smoker (n) % 11 (44%) Smoker (n) % 1 (4%) PY (mean [+ or -] SD) 25.4 ([+ or -]34.2) FEV1% (n = 25) 80.4 [+ or -] 18.8 FVC% (n = 25) 77.5 [+ or -] 21.8 FEV1%/FVC (n = 25) 82 [+ or -] TLC% (n = 23) 61.4 [+ or -] 13.7 DLCO% (n = 23) 45.6 [+ or -] 13.2 Comorbid disease (n = 25) Arterial hypertension 10 (40%) Coronary disease 4 (16%) Diabetes mellitus 3 (12%) Gastroesophageal reflux symptoms 5 (20%) M/F: male/female, PY: pack/years, FEVi: forced expiratory volume at one second, FVC: forced vital capacity, TLC: total lung capacity
, and DLCO: diffusing capacity for carbon monoxide.
smokers with interstitial lung abnormalities on high-resolution CT show both reduced total lung capacity
and a lesser amount of emphysema, compared with those who didn't have interstitial lung abnormalities.
Two most common errors observed during assessment were not to have normal exhalation of air before activation of inhaler device (step3) and holding the breath for minimum 4 seconds after inhaling the drug to total lung capacity
The researchers found that interstitial lung abnormalities are associated with both reduced total lung capacity
and less emphysema in smokers.
Pre Bronchodilator Actual % Predicted FVC (L) 2.00 50 [FEV.sub.1] (L) 0.98 32 [FEV.sub.1]/FVC (%) 49 63 TLC (L) 7.90 113 RV (L) 5.34 234 RV/TLC (%) 68 205 [D.sub.L]CO (mL/min/mmHg) 15.51 48 [D.sub.L]CO/VA (mL/min/mmHg/L) 3.37 73 Post Bronchodilator Actual % Predicted % Change FVC (L) 2.20 55 10 [FEV.sub.1] (L) 1.23 40 25 [FEV.sub.1]/FVC (%) 72 14 TLC (L) RV (L) RV/TLC (%) [D.sub.L]CO (mL/min/mmHg) [D.sub.L]CO/VA (mL/min/mmHg/L) FVC = forced vital capacity; FEV = forced expiratory volume at one second; TLC = total lung capacity
; RV = esidual volume; [D.sub.L]CO = diffusing capacity of the lung for carbon monoxide; and VA = measurement of alveolar volume.
Also, many children with asthma have normal-range forced expiratory volume in 1 second ([FEV.sub.1]) values when stable because they can hyperinflate and increase their total lung capacity
with less airway resistance to airflow; that feature has led to many a missed pediatric asthma diagnoses.
George's Respiratory Questionnaire total score; TLC = total lung capacity
; UCSD SOBQ = University of California, San Diego Shortness of Breath Questionnaire; VA = Department of Veterans Affairs.
A study by Cordova et al (17) examined long-term stability of improvements in exercise capacity and HRQL as measured by the SIP post-LVRS in patients with severe COPD, as determined by [FEV.sub.1] and hyperinflation (total lung capacity
The COPD patients with OSA also had a significantly lower percentage of total lung capacity