To develop reference equations of maximal voluntary ventilation (MVV) in children and adolescents, and to test the validity and reproducibility of MVV.
A total of 348 healthy volunteers (6‐17 years)—248 for the development of reference equations and 100 to test the validity— were selected.
Spirometry and MVV were performed. Volunteers were instructed to breathe quickly and strongly to estimate the MVV. Independent variables tested were age, sex, weight, height, and pulmonary function.
All volunteers (50% boys) had a normal pulmonary function. Mean MVV was 66.3 (17.8) L/minute for children and 118.8 (20.0) L/minute for adolescents. The equation developed for children was MVV = 4.865 + (forced expiratory volume in the first second [FEV1] × 16.257) + (peak expiratory flow [PEF] × 7.621); for adolescents was MVV = −25.450 + (FEV1 × 11.591) + (PEF × 6.672) + (sex × 12.179) + (age × 3.613). No significant differences were observed between measured and predicted MVV in children (64.6 [10.3] vs 64.6 [8.5] L/minute; P = .34) or adolescents (111.8 [23.4] vs 113.1 [22.8] L/minute, P = .12). The intraclass correlation coefficient between measured and predicted MVV was 0.95 (0.91‐0.97) for children and 0.90 (0.82‐0.94) for adolescents. The mean bias of Bland‐Altman analysis was −0.8 L/minute for children and −2.7 L/minute for adolescents.
Normative values for MVV were established for children and adolescents, additionally, these equations are reproducible and it can be used to determine the respiratory impairments in the pediatric population.
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
SYNAT - “Interdisciplinary System for Interactive Scientific and Scientific-Technical Information”.