Time limit and time at (V) over dot O2max, during a continuous and an intermittent run

Background. The purpose of this study was to verify by track field tests, whether sub-elite runners (n=15) could (i) reach their (V) over dot(2max) while running at v50% Delta i.e. midway between the speed associated with lactate threshold (VLAT) and that associated with maximal aerobic power (v(V) over dot(2max)), and (ii) if an intermittent exercise provokes a maximal and/or supra maximal oxygen consumption longer than a continuous one. Methods. Within three days, subjects underwent a multistage incremental test during which their v(V) over dotO(2max) and vLAT were determined; they then performed two additional testing sessions, where continuous and intermittent running exercises at v50%Delta were performed up to exhaustion, Subject's gas exchange and heart rate were continuously recorded by means of a telemetric apparatus. Blood samples were taken from fingertip and analysed for blood lactate concentration. Results. in the continuous and the intermittent tests peak (V) over dot(2) exceeded (V) over dot(2max) values, as determined during the incremental test. However in the intermittent exercise, peak (V) over dot(2), time to exhaustion and time at (V) over dot: reached significantly higher values, while blood lactate accumulation showed significantly lower values than in the continuous one. Conclusions, The v50%Delta is sufficient to stimulate (V) over dot(2max) in both intermittent and continuous running, The intermittent exercise results better than the continuous one in increasing maximal aerobic power allowing longer time at (V) over dot (2max) and obtaining higher peak (V) over dot (2) with lower lactate accumulation.