 Physiological functional capacity (PFC) is a measure of an individual's performance level that gauges one's ability to perform the physical tasks of daily life and the ease with which these tasks are performed.PFC declines with advancing age to result in frailty, cognitive disorders, or physical disorders, all of which may lead to labeling individuals as disabled.There are many different causes of disability that often affect basic activities of daily living, such as eating, dressing, transferring, and maintaining personal hygiene; or advanced activities of daily living such as shopping, food preparation, driving, or working.