ENS 304 Lecture Notes - Lecture 2: Lung Volumes, Vital Capacity, Exhalation
21 Jul 2020
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Spirometry: attaching a participant to a metabolic cart or a hand-held device to measure lung volume values. Tidal volume (tv): 1 normal breath cycle of inhalation and exhalation. Vital capacity (vc): 1 maximal breath cycle of inhalation and exhalation. Residual volume (rv): volume of leftover air in lungs following max exhalation, needed to prevent collapse. Restrictive: reduces capacity of inhalation (low vital capacity) Obstructive: impairs capacity to exhale (increased residual volume) Forced vital capacity (fvc): measurement of the capacity to force air in and out of the lungs. Fev1: measure of the amount of air maximally exhaled air in one second. Minute ventilation (ve): breath rate x tidal volume. Breath rate: rate at which you are inhaling x exhaling in ventilatory response during exercise: An initial increase in tv until threshold is reached. After tv reaches a threshold, total minute ve keeps increasing through an increase in bp. Vt1: point where br begins to increase.
