The normal values and procedures for lung function testing are given in the references below (Miller et al, 2005). The Flow volume loop is a dynamic measure of assessing lung function which gives information on both the expiratory and inspiratory function of the lungs. The breath-hold time (BHT) varies between individuals based on a variety of factors such as lung size, effort, gender and ethnicity .
1.To measure lung function
2.To investigate the effect of lung size on breath hold time