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The Journal of Sports Medicine and Physical Fitness 2000 September;40(3):185-94

lingua: Inglese

Effect of a ­prior inter­mit­tent run at vVO2max on oxy­gen kinet­ics dur­ing an all-out ­severe run in ­humans

Billat V. L. 1, Bocquet V. 1, Slawinski J. 1, Laffite L. 1, Demarle A. 1, Chassaing P. 1, Koralsztein J. P. 2

1 Laboratoire d’Étude de la Motricité Humaine, Université de Lille II, Faculté des Sciences du Sport, Ronchin, France;
2 Centre de Médecine du Sport ­CCAS, Paris, France


Background. The pur­pose of ­this ­study was to exam­ine ­the influ­ence of ­prior inter­mit­tent run­ning at V.O2max on oxy­gen kinet­ics dur­ing a con­tin­u­ous ­severe inten­sity run and the ­time ­spent at V.O2max.
Methods. Eight ­long-dis­tance run­ners per­formed ­three max­i­mal ­tests on a syn­thet­ic ­track (400 m) ­whilst breath­ing ­through the COS­MED K4 port­able tele­met­ric meta­bol­ic anal­y­ser: i) an incre­men­tal ­test ­which deter­mined veloc­ity at the lac­tate thresh­old (vLT), V.O2max and veloc­ity asso­ciat­ed ­with V.O2max (vV.O2max), ii) a con­tin­u­ous ­severe inten­sity run at vLT+50% (vΔ50) of the dif­fer­ence ­between vLT and vV.O2max (91.3±1.6% vV.O2max) pre­ced­ed by a ­light con­tin­u­ous 20 min­ute run at 50% of vV.O2max (­light ­warm-up), iii) the ­same con­tin­u­ous ­severe inten­sity run at vΔ50 ­with a ­prior inter­val train­ing exer­cise (­hard ­warm-up) of repeat­ed ­hard run­ning ­bouts per­formed at 100% of vV.O2max and ­light run­ning at 50% of vV.O2max (of 30 sec­onds ­each) per­formed ­until exhaus­tion (on aver­age 19±5 min ­with 19±5 inter­val rep­e­ti­tions). This ­hard ­warm-up speed­ed the V.O2 kinet­ics: the ­time con­stant was ­reduced by 45% (28±7 sec vs 51±37 sec) and the ­slow com­po­nent of V.O2 (ΔV.O2 6-3 min) was delet­ed (-143±271 ml.min-1 vs 291±153 ml.min-1). In con­clu­sion, ­despite a sig­nif­i­cant­ly low­er ­total run ­time at vΔ50 (6 min 19±0 min 17 vs 8 min 20±1 min 45, p=0.02) ­after the inter­mit­tent ­warm-up at V.O2max, the ­time ­spent spe­cif­i­cal­ly at V.O2max in the ­severe con­tin­u­ous run at vΔ50 was not sig­nif­i­cant­ly dif­fer­ent.

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