id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-006261-yw5k8qkz	Heath, Gregory W.	Exercise and Upper Respiratory Tract Infections: Is There a Relationship?	2012-10-23		.txt	text/plain	6209	329	44	Few studies have investigated the common belief that moderate physical activity is beneficial in decreasing risk of respiratory tract infections and improving immune function. Laboratory and clinical studies suggest that changes in immune parameters associated with heavy train ing lead to adverse health effects, particularly an increase in the incidence or severity of upper respiratory tract infections. During this time, the women in the exercise group experienced fewer upper respiratory tract infection symptom days, improved cardiorespiratory fitness, and increased natural killer cell numbers compared with their sedentary controls. This study indicates that intensity of exercise may playa role, and that moderate activity may actually improve immune function and associated upper respiratory tract infection symptoms. Clinical studies examining the effects of moderate levels of physical activity have shown possible enhanced immune responses with a concomitant impact on the length and severity of an upper respiratory tract infection. The effects of moderate exercise training on natural killer cells and acute upper respiratory tract infections	./cache/cord-006261-yw5k8qkz.txt	./txt/cord-006261-yw5k8qkz.txt