Hazards of long distance cycling.

Abstract

\ The mean deficits in PEF in men and women smoking fewer than 20 cigarettes a day were 48 1 and 47-4 b/min, respectively. In men smoking 20 or more a day the mean deficit was 73-3 1/min. A smaller but still significant deficit (27-8 1/min) was found in male ex- smokers of 20 or more cigarettes a day, whereas in the male and female ex-smokers of fewer than 20 cigarettes a day no significant reduction of PEF was present.