The intent of this project was to evaluate the benefits of swim training at 76 ± 2% V02 max for 60 vs 20 min duration would have on submaximal and maximal swimming performances. Moderately trained swimmers (n = 17) were divided into two groups. The GRP1 (n = 7) trained for 60 min while GRP2 trained 20 min per session. Both groups worked at the same intensity (76 ± 2% V0 2 max) and frequency (5 sessions per week). The duration of the study was 5 weeks. The primary findings of this study included: (1) 60 min of moderate intensity swimming resulted in enhanced perfomance (91.44 and 365.88 m), increased aerobic power and swimming efficiency (P < 0.05); (2) 20 minutes of work was adequate in maintaining aerobic power and improving swimming efficiency, but did not result in faster swimming; (3) 60 and 20 min of work at 76 ± 2% V0 2 max resulted in a decrease of muscle CS and PFK activity.
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