The effects of constant vs. interval load training at and about the first ventilatory threshold on endurance performance indicators

grantor: University of TorontoThirteen sedentary subjects (five males and eight females) were randomly assigned to a constant load (CT) or interval load (IT) group. Exercise training corresponded to an intensity at or about the first ventilatory threshold (Tv1). The CT group increased V¤O2max from 33.2 (±3.5) ml·(kg·min)-1 to 40.1 (±4.3) ml·(kg·min)-1, and Tv 1 from 19.2 (±2.9) ml·(kg·min)-1 to 24.7 (±1.8) ml·(kg·min)-1, after eight weeks. The CT group increased V¤O2max from 31.6 (±8.9) ml·(kg·min)-1 to 38.8 (±7.3) ml·(kg·min) -1, and Tv1 from 17.7 (±4.4) ml·(kg·min) -1 to 22.8 (±4.7) ml·(kg·min)-1 . These changes were significant. Between group differences for endurance performance improvements could not be detected after training, though there appeared to be a possible difference in the time course for adaptation, which could not be resolved with significance due to insufficient sample size. Conclusive statements regarding the effects of exercise training on the 'breath sound check' method of monitoring exercise intensity will require further research. The choice of CT vs. IT protocols in the training of sedentary persons will likely come down to subject preference.M.Sc