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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Demarie S. 1, 3, Koralsztein J. P. 2, Billat V. 1, 2
1 Laboratoire d’étude de la motricité humaine Université Lille 2
2 Centre de Médecine du Sport, Paris
3 Rome University Institute of Sport Sciences
Background. The purpose of this study was to verify, by track field tests, whether sub-elite runners (n=15) could (i) reach their V·O2maxwhile running at v50%∆, i.e. midway between the speed associated with lactate threshold (vLAT) and that associated with maximal aerobic power (vV·O2max), 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 vV·O2max and vLAT were determined; they then performed two additional testing sessions, where continuous and intermittent running exercises at v50%∆ 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·O2 exceeded V·O2max values, as determined during the incremental test. However in the intermittent exercise, peak V·O2, time to exhaustion and time at V·O2max reached significantly higher values, while blood lactate accumulation showed significantly lower values than in the continuous one.
Conclusions. The v50%∆ is sufficient to stimulate V·O2max 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·O2max and obtaining higher peak V·O2 with lower lactate accumulation