The lactate minimum test protocol provides valid measures of cycle ergometer VO(2)peak

Area of Science:

• Exercise Physiology
• Sports Science
• Cardiorespiratory Fitness

Background:

• The Lactate Minimum Test (LMT) is used to assess exercise physiology.
• Determining peak oxygen uptake (VO(2)peak) is crucial for athletic performance evaluation.
• Understanding physiological responses to high-intensity exercise protocols is essential.

Purpose of the Study:

• To validate the Lactate Minimum Test (LMT) for determining peak oxygen uptake (VO(2)peak) on a cycle ergometer.
• To assess submaximal oxygen uptake (VO(2)) and pulmonary ventilation (VE) responses following high-intensity exercise.
• To compare physiological markers between a standard incremental test and an LMT protocol.

Main Methods:

• Ten trained male athletes (triathletes, cyclists) completed two randomized cycle ergometer tests.
• Control Test (CT): Incremental exercise to exhaustion.
• Lactate Minimum Test (LMT): Incremental test preceded by two 30-second supramaximal bouts to induce acidosis.

Main Results:

• No significant difference was found in peak oxygen uptake (VO(2)peak) between the CT and LMT.
• Maximal power output (POmax) was significantly lower in the LMT compared to the CT.
• Oxygen uptake (VO(2)) and pulmonary ventilation (VE) were significantly elevated at initial power outputs during the LMT.

Conclusions:

• The Lactate Minimum Test (LMT) is a valid protocol for assessing peak oxygen uptake (VO(2)peak).
• The LMT protocol alters submaximal physiological responses, indicating a greater initial metabolic cost.
• While valid for VO(2)peak, the LMT protocol may reduce the maximal power output achieved.