[Effect of the dynamic factor on the discharge frequency of high threshold pulmonary stretch receptors in cats]

The discharge frequency of high threshold pulmonary stretch receptor at the end of inspiration is much greater than at the corresponding lung volume under static conditions. During inspiratory phase the discharge frequency of some receptors (type IV) is created by dynamic factor by 90% ("rate" receptors). In static conditions the lowering of discharge frequency of most of the receptors under study makes 9--13% at 10s, though in some receptors (type III)--makes 28% at 10s. Properties of most of the pulmonary stretch receptors under study were changed with increasing of threshold. The frequency of discharges during inspiratory phase or lung inflation becomes lower, the influence of dynamic factor on receptor activity becomes relatively potent, the frequency of discharges vs lung volume ratio becomes different.