RESUMEN
The time sustained during exercise with oxygen uptake (VÌO2) reaching maximal rates (VÌO2peak) or near peak responses (i.e., above second ventilatory threshold [t@VT2) or 90% VÌO2peak (t@90%VÌO2peak)] is recognized as the training pace required to enhance aerobic power and exercise tolerance in the severe domain (time-limit, tLim). This study compared physiological and performance indexes during continuous and intermittent trials at maximal aerobic velocity (MAV) to analyze each exercise schedule, supporting their roles in conditioning planning. Twenty-two well-trained swimmers completed a discontinuous incremental step-test for VÌO2peak, VT2, and MAV assessments. Two other tests were performed in randomized order, to compare continuous (CT) vs. intermittent trials (IT100) at MAV until exhaustion, to determine peak oxygen uptake (Peak-VÌO2) and VÌO2 kinetics (VÌO2K). Distance and time variables were registered to determine the tLim, t@VT2, and t@90%VÌO2peak tests. Blood lactate concentration ([La-]) was analyzed, and rate of perceived exertion (RPE) was recorded. The tests were conducted using a breath-by-breath apparatus connected to a snorkel for pulmonary gas sampling, with pacing controlled by an underwater visual pacer. VÌO2peak (55.2 ± 5.6 ml·kg·min-1) was only reached in CT (100.7 ± 3.1 %VÌO2peak). In addition, high VÌO2 values were reached at IT100 (96.4 ± 4.2 %VÌO2peak). VÌO2peak was highly correlated with Peak-VÌO2 during CT (r = 0.95, p < 0.01) and IT100 (r = 0.91, p < 0.01). Compared with CT, the IT100 presented significantly higher values for tLim (1,013.6 ± 496.6 vs. 256.2 ± 60.3 s), distance (1,277.3 ± 638.1 vs. 315.9 ± 63.3 m), t@VT2 (448.1 ± 211.1 vs. 144.1 ± 78.8 s), and t@90%VÌO2peak (321.9 ± 208.7 vs. 127.5 ± 77.1 s). VÌO2K time constants (IT100: 25.9 ± 9.4 vs. CT: 26.5 ± 7.5 s) were correlated between tests (r = 0.76, p < 0.01). Between CT and IT100, tLim were not related, and RPE (8.9 ± 0.9 vs. 9.4 ± 0.8) and [La-] (7.8 ± 2.7 vs. 7.8 ± 2.8 mmol·l-1) did not differ between tests. MAV is suitable for planning swimming intensities requiring VÌO2peak rates, whatever the exercise schedule (continuous or intermittent). Therefore, the results suggest IT100 as a preferable training schedule rather than the CT for aerobic capacity training since IT100 presented a significantly higher tLim, t@VT2, and t@90%VÌO2peak (â¼757, â¼304, and â¼194 s more, respectively), without differing regards to [La-] and RPE. The VÌO2K seemed not to influence tLim and times spent near VÌO2peak in both workout modes.