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THE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS

Rivista di Medicina, Traumatologia e Psicologia dello Sport


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Original articles  EXERCISE PHYSIOLOGY AND BIOMECHANICS


The Journal of Sports Medicine and Physical Fitness 2003 Settembre;43(3):279-84

lingua: Inglese

The lactate minimum test protocol provides valid measures of cycle ergometer V.O2peak

Dantas De Luca R., Rocha R., Burini R. C., Coelho Greco C., Denadai B. S.

Human Performance Laboratory UNESP, Rio Claro, Brazil Metabolism and Nutrition Center UNESP, Botucatu, Brazil


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Aim. The aim of the present study was to investigate the validity of the Lactate Minimum Test (LMT) for the determination of peak ˙VO2 on a cycle ergometer and to determine the submaximal oxygen uptake (˙VO2) and pulmonary ventilation (VE) responses in an incremental exercise test when it is preceded by high intensity exercise (i.e., during a LMT).
Methods. Ten trained male athletes (triathletes and cyclists) performed 2 exercise tests in random order on an electromagnetic cycle ergometer: 1) Control Test (CT): an incremental test with an initial work rate of 100 W, and with 25 W increments at 3-min intervals, until voluntary exhaustion; 2) LMT: an incremental test identical to the CT, except that it was preceded by 2 supramaximal bouts of 30-sec (~120% ˙VO2peak) with a 30-sec rest to induce lactic acidosis. This test started 8 min after the induction of acidosis.
Results. There was no significant difference in peak ˙VO2 (65.6±7.4 ml.kg-1.min-1; 63.8 ± 7.5 ml.kg-1.min-1 to CT and LMT, respectively). However, the maximal power output (POmax) reached was significantly higher in CT (300.6±15.7 W) than in the LMT (283.2±16.0 W). ˙VO2 and VE were significantly increased at initial power outputs in LMT.
Conclusion. Although the LMT alters the submaximal physiological responses during the incremental phase (greater initial metabolic cost), this protocol is valid to evaluate peak ˙VO2, although the POmax reached is also reduced.

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