The effect of endurance swimming on the cardiorespiratory fitness levels of sedentary, middle aged men and women

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Luetkemeier, Maurie J.
Getchell, Bud, 1934-
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Thesis (M.A.)
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Twelve middle aged men and women (23-59 years) participated in twelve weeks (36 sessions) of endurance swim training at an approximate intensity of 75% maximum heart rate (Karvonen Method) (14). This training resulted in improved cardiorespiratory fitness as evidenced by a significant (9.4%) increase in mean maximal oxygen uptake (liters/ min.) and a significant bradycardial response during submaximal walking. Subjects lost significant amounts of subcutaneous body fat, as measured by skinfold calipers, but experienced very little change in absolute body weight (.1 kg.) suggesting an increase in muscle weight. Data from the submaximal walking test, administered after each 12 session period of training, showed a nonlinear decline in heart rate throughout training. This, possibly, was in response to an accumulating fatigue factor brought on by a rapid increase in the amount of total work that the subjects were doing during the middle stage of training.