COSMED K5 Wearable Metabolic System
The clinical-grade portable VO2 max system — laboratory accuracy, field portability.
The portable VO2 max system that performance institutes, Olympic training centers, and elite-tier longevity clinics use — COSMED K5 brings laboratory accuracy out of the lab.
Most consumer "VO2 max" estimates from wearables are calibrated guesses. The actual clinical-grade measurement requires breath-by-breath analysis of inhaled and exhaled gases during graded exercise — which requires equipment most longevity-focused individuals never see. The COSMED K5 is that equipment in a wearable form factor: a chest-worn analyzer that measures O2 consumption and CO2 production breath-by-breath, with the same accuracy as the stationary lab equipment used in cardiology.
For home buyers: the K5 isn't really designed for home ownership. The natural buyers are private trainers serving HNW clientele, longevity clinics, and family-office wellness installations. The unit pays for itself when measuring multiple people regularly — running quarterly VO2 max + lactate threshold testing on a household + extended family becomes feasible at a fraction of the per-test clinical price ($300-500 per session at outside labs).
The ROI argument: roughly 30-50 tests amortizes the unit. For a family office running multiple members through quarterly performance testing, the math works.
Family offices with multiple longevity-focused members. Private trainers / coaches serving HNW clients. Buyers who specifically want the gold-standard measurement quality, not the wearable-estimated version.
You only need 1-2 VO2 measurements per year (use a clinic). You don't want B2B-tier purchasing complexity (annual calibration contract, occasional service visits).
Specifications
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COSMED K5 Wearable Metabolic System
$14,000–$18,000 · Verified 2026-05-04
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