VO₂max

Maximum rate of oxygen the body can take up and use during intense exercise, expressed in mL O₂ per kg of body weight per minute. Gold-standard measurement is via cardiopulmonary exercise testing (CPET) with gas analysis. Wearable estimates infer VO₂max from sub-maximal heart-rate response and demographic data.

VO₂max integrates pulmonary gas exchange, cardiac output, oxygen transport, and mitochondrial function in skeletal muscle. Each one-MET (~3.5 mL/kg/min) increase in fitness is associated with roughly 13% lower all-cause mortality in cohort meta-analyses. The largest mortality reduction is in the move from low to merely below-average fitness, not from average to elite.

These consumer wearables and connected devices report this metric. Healicus is not connected to your device — your data lives in the maker's app and never reaches us.

• PNOĒ

  US · EU · INTL

  Clinical-grade metabolic and VO2-max testing at partner gyms and clinics — the gold-standard treadmill protocol.

  Visit PNOĒ

• Garmin

  INTL

  Sports-watch range with on-watch VO2-max estimate, HRV status, and lab-validated heart-rate tracking.

  Visit Garmin

• Polar

  INTL

  Heart-rate-strap pioneer — H10 chest strap is the lab-validated reference for HRV beat-to-beat capture.

  Visit Polar

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Norms are reported by age, sex, and assessment method. Wearable-estimated VO₂max is systematically less accurate than CPET; absolute values can differ by 10–15%. Track trends on the same device for longitudinal comparison.

Beta-blockers blunt heart-rate response and invalidate submaximal estimates. Recent illness, dehydration, and acclimatisation status all affect single readings. Track 4-week rolling averages.

• How your VO₂max compares to age- and sex-adjusted norms.
• Whether a formal CPET would be useful given your risk profile (especially if you have known cardiovascular disease or are over 60 and unfit).
• What training intensity distribution best targets fitness improvement at your current level.

1. [1]Ross et al., AHA Scientific Statement — Importance of assessing cardiorespiratory fitness in clinical practice(2016)
2. [2]ACSM's Guidelines for Exercise Testing and Prescription, 11th edition(2022)
3. [3]Kokkinos et al., Cardiorespiratory fitness and the paradoxical BMI-mortality risk association in male veterans(2018)
4. [4]Mandsager et al., Association of cardiorespiratory fitness with long-term mortality among adults(2018)
5. [5]Ekblom-Bak et al., A new submaximal cycle ergometer test for prediction of VO2max(2014)
6. [6]Lavie et al., Exercise and the cardiovascular system — clinical science and cardiovascular outcomes(2015)