VO2 max measurement

Assessment of maximal oxygen uptake (VO2max) to evaluate aerobic capacity.

VO₂ max Test

• Objective: To evaluate an athlete’s maximal aerobic capacity, which is defined as the maximum volume of oxygen the body can consume per minute per kilogram of body weight (ml·kg⁻¹·min⁻¹).
• ⚙️ Equipment Needed:
  • Cycle ergometer or motorized treadmill.
  • Respiratory gas analysis system (face mask, flow meter, O₂/CO₂ analyzer).
  • Heart rate monitor (ECG or chest strap).
  • Electrocardiograph (if available for medical monitoring).
  • Stopwatch and logbook.
  • Scale for weight measurement.
• Protocol (Standard incremental test example):
  • Installation: Equip the athlete with the mask and heart rate monitor. Verify the calibration of the respiratory system.
  • Warm-up: 5 to 10 minutes at low intensity (50% of estimated VO₂ max).
  • Incremental Phase: Regular increase in workload:
    • Cycle ergometer: + 25 W every 2 minutes.
    • Treadmill (Bruce protocol): Increase in speed and incline every 3 minutes.
  • Termination Criteria (at least one of the following):
    • VO₂ plateau (maximum reached despite increasing effort).
    • RER (Respiratory Exchange Ratio) > 1.10.
    • Heart rate approaching theoretical max HR (± 10 bpm).
    • Muscular fatigue or symptoms (dizziness, nausea).
  • Recovery: 5 minutes at low load, followed by a cool-down period and measurement of vital signs.
• Evaluation:
  • Absolute VO₂ max (L·min⁻¹) and relative VO₂ max (ml·kg⁻¹·min⁻¹).
  • Ventilatory Thresholds (VT1, VT2) if analyzed.
  • Heart rate vs. power or speed curve.
• ✅ Recommendations:
  • Follow the same protocol for longitudinal comparisons.
  • Calibrate the gas analyzer thoroughly before each test.
  • Perform the test after 48 hours of rest and at the same time of day.
  • Disclose any medical contraindications (cardiac or respiratory).
• Indicative VO₂ max Norms (ml·kg⁻¹·min⁻¹):

Age (years)	Men – Excellent	Men – Average	Women – Excellent	Women – Average
20–29	> 56	42–46	> 48	35–39
30–39	> 52	39–43	> 45	33–36
40–49	> 47	36–40	> 41	30–33
50–59	> 42	33–36	> 38	27–31
60+	> 38	30–33	> 35	24–27