Abstract
Reanalysis of previously-presented data on changes in swimming speed supported an earlier claim that declines in speed with age were greater in shorter, anaerobically-swum races than in longer, aerobically-swum races. However, when average speeds of older cohorts were expressed as a proportion of the average speeds of younger cohorts for the same race, the opposite conclusion was supported. It is argued that neither of these findings can be accounted for by the hypothesis that age declines are greater in events in which the ratio of power required to power available is greater.