[Experimental] List of manuscripts available for review volunteers
1 manuscript available for review volunteers
December 24, 2017
Background The norms for evaluating the maximum expiratory flow usually are developed according to chronological age and height. However, to date, little research has been conducted using reference values that take into account the temporal changes of biological maturation. The objectives of this study were to a) compare the maximum expiratory flow (MEF) with those of other international studies, b) align the MEF values with chronological and biological age, and c) propose reference standards for children and adolescents. Methods The sample studied consisted of 3,566 students of both sexes (1,933 males and 1,633 females) ranging in age from 5.0 to 17.9 years old. Weight, standing height, and sitting height were measured. Body Mass Index (BMI) was calculated. Biological maturation was predicted by using age of peak height velocity growth (APHV). Maximum expiratory flow (MEF) (L/min) was obtained by using a forced expiratory manoeuvre. Percentiles were calculated using the LMS method. Results and Discussion Biological age in males occurred at age 14.77±0,78APHV and for females at age 12.74±1.0APHV. Differences emerged in the MEF for students of the Maule Region and the international references. Biological age allowed us to distinguish differences based on sex. Biological age was more useful than chronological age. The resulting MEF values from this research were less than those reported for international standards. Based on these findings, regional percentiles were created to diagnose and monitor the risk of asthma and the general expiratory status of paediatric populations.

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