IO8 · Tests
Biological Age Test
How old is your body, really?
€250 per person · 30 minutes · report within 48 hours
Book a test · €25001 · The test
What the test tells you
Your date of birth says one thing. Your metabolism says another.
The IO8 test uses PNOĒ, a clinical-grade metabolic analyser. It measures your breathing at rest, breath by breath: the oxygen you take in, the carbon dioxide you breathe out, and what that reveals about your heart, your lungs and your cells.
Seven questions, one measured answer
- How fast does your metabolism run at rest?
- How many calories does your body really burn each day?
- Does it burn mostly fat or sugar?
- Do your heart, lungs and cells work well together?
- What is your biological age, compared with your actual age?
- Does your breathing weigh on your posture and focus?
- Where should you start to improve, before you measure again?
In practice
- 10 minutes of breathing at rest, through a mask. 30 minutes in all, with set-up and explanations
- No effort, no needles
- A written report within 48 hours
- A debrief with Stéphane Pariente, founder of the IO8 Living Lab
02 · The measurement
What the measurement reveals
Breath by breath, hundreds of measurements gathered into six areas.
Metabolism and energy
Your resting metabolic rate and your real calorie needs. Measured, not calculated from a formula.
Fat, sugar and cells
How much fat and sugar your body uses at rest, a reflection of how your mitochondria work.
Heart and lungs
Breathing efficiency, ventilation, and the first signs of cardiovascular limits.
Biological age
Your metabolic age compared with your actual age. What matters is how it moves, measured the same way.
Breathing and focus
How you breathe at rest, and how it links to back tension and mental clarity.
VO2 max, from November
The best predictor of life expectancy we know how to measure. It does not give a date, it gives a risk. And it improves, even late in life.
03 · Tests
Choose your test
Biological age test
€250
per person
- ·10 minutes of breathing at rest, through a mask
- ·Written report within 48 hours
- ·Debrief with the founder
Two tests, 3 or 6 months apart
€450
per person
- ·Two measurements
- ·Two reports
- ·A debrief on what has changed
Biological age + VO2 max
€550
from November 2026
- ·Resting test
- ·Exercise test on the station
- ·One combined report
VO2 max test
€350
from November 2026
- ·Exercise test on the station
- ·Report within 48 hours
- ·Debrief
VO2 max testing opens in November 2026, once the exercise station and safety protocol are in place at the Living Lab.
04 · The report
What you receive
- A written report within 48 hours, in English, French or Portuguese
- Your results compared with people of your age and sex
- Three priorities, in plain words, to act on before you measure again
- A debrief with Stéphane Pariente to read the report together
The measurement is the same everywhere. What changes is what you do with it.
05 · Questions
Frequently asked questions
Who is this test for?
For anyone who wants to know the real state of their body, whatever their level. It is especially useful after fifty, when muscle mass and aerobic capacity start to decline.
Do I need to be athletic?
No. The biological age test is done at rest, seated. No effort is required.
Is it invasive?
No. No needles, no blood test. You breathe normally into a mask for ten minutes.
How should I prepare?
For three hours before the test: nothing to eat, only water, and no coffee, tobacco or stimulating drinks. No intense exercise, and no session longer than one hour, in the 24 hours before. Keep taking your medication as usual. Arrive ten minutes early so you can settle in. If you repeat the test, come at the same time of day as the first one.
What is VO2 max for?
It is today the best predictor of life expectancy we know how to measure. It does not give a date, it gives a risk. Exercise testing opens in November 2026.
Why repeat the test?
A biological age is not compared with other people's. It is compared with your own, three or six months earlier.
06 · Principles
Our principles
- Measure rather than promise.
- A real measurement of your breath, not a questionnaire.
- IO8 measures; medical acts are performed by medical partners.
- Your data stays yours. Nothing is shared without your consent.
IO8 promises a measurement, an explanation and a document. Never a result.
07 · Process
How it works
I
Book
Choose a date, at the Living Lab near Lisbon or at your venue.
II
Measure
10 minutes of normal breathing through a mask. 30 minutes in all.
III
Understand
Your report within 48 hours, and a debrief to read it together.
08 · Book
Book your test
€250 per person. At the IO8 Living Lab near Lisbon, or at your venue.
Travel costs extra outside the Lisbon area.
