[The effect of trigeminal zone irritation on parameters of forced vital capacity in humans].
In 44 healthy males aged 18-21 years, the authors studied the effect of irritation of the trigeminal zone by ammonia vapors and by immersion of the face into water on parameters of forced vital capacity. Inhalation of ammonia immediately induced impairment of all the studied parameters of forced expiration. In the later time intervals (up to the 10th minute after inhalation) the air flow remained reduced over the whole forced expiration (FVC/FET), mainly at the expense of decreased air flow at the end of forced expiration (FEF75-85%). Inhalation of ammonia also resulted in abolition of the psychically induced higher heart rate and in its normalization. Immersion of the face into cold water caused reduction in the values of FVC, FEV1, FVC/FET, and FEF0-25%. After voluntary apnea in the air there was only a small reduction of FEF0-25%. In the light of these findings, the authors consider irritation of cold receptors of the face to be the main cause of the changes in functional parameters of the lungs during immersion reflex.
Javorka
K
K
Bublincová
L
L
Pasková
J
J
Záborský
T
T
D000293:Adolescent; D000328:Adult; D000641:Ammonia; D001049:Apnea / Q000503:physiopathology; D003080:Cold Temperature; D005541:Forced Expiratory Volume; D006801:Humans; D008297:Male; D014276:Trigeminal Nerve / Q000502:physiology* / Q000503:physiopathology; D014797:Vital Capacity
D000641:Ammonia
Vplyv drázdenia trigeminálnej zóny na parametre úsilného výdychu vitálnej kapacity pl'úc u l'udí.