A
The XPaze station
Fixed in the spacecraft or habitat. Tap your card and grip the two handles: in one gesture it reads more than ten signals, from your ECG to your stress level and your grip strength.
Health monitoring for space
Health for those who travel beyond Earth.
- Guided check-up
- Explainable traffic light
- Paze, a voice psychologist
- Live space weather
XPaze learns what each astronaut is like, notices when they are no longer themselves and explains why. No cables, no waiting on Earth.
Live · XPaze station v2simulated
Heart rate62bpm
HRV52ms
Temperature36.6°C
Breathing14rpm
ECG · 25 mm/sSinus rhythm
01 — The problem
A single reading
says very little.
Microgravity, isolation, disrupted sleep, stress and months away from any hospital. The health data exists, but it arrives in pieces and is looked at separately.
Heart rate
Heart rate variability
Temperature
Blood oxygen
Sleep
Activity
Breathing
Cabin CO₂
Recovery
One single reading
One single readingWhat matters is what happens when several change at once.
XPaze was built to read them together.
02 — The idea
It doesn’t ask how much.
It asks if it’s normal.
Other devices tell you “108 bpm”. XPaze asks a far more useful question: is it normal for this person to be at 108 bpm right now?
Measured heart rate
108bpm
- Recent activity
- Her normal resting heart rate: 62 bpm
- Other signals out of range
- Lasting a while
03 — The system
Three parts.
One reading.
It isn’t one more gadget to wear. It combines what is already on board with what the astronaut already carries.
B
Their watch, if they wear one
If they already wear a compatible watch, XPaze adds its heart rate, sleep and activity. If not, everything works the same. It’s one more source, not a requirement.
C
The app
On the station’s screen or your phone, with no internet needed. It sums up the status at a glance, explains any change and also looks after mood and attention.
→
One check-up, one gesture.
- It knows who you areYou tap your card on the RFID reader.
- Handles with electrodesCopper tape records your ECG. In microgravity, they also hold you in place.
- Heart rate and oxygenYour thumb rests on a small window in the right handle.
- Temperature without touchingIt checks your forehead is 1–2 cm away, then measures.
The sensors of station v2.
Twelve sensors in one gesture. You can try all of them in the app, with a station simulated beat by beat.
- ECG · 1 lead
- Copper handles as electrodes: rhythm, atrial fibrillation, ectopic beats and QTc.
- PPG oximeter
- Heart rate and blood oxygen at the thumb.
- IR thermometer + ToF
- Contactless body temperature, measured only at the right distance.
- Breathing rate
- Derived from how the ECG and pulse wave change with each breath.
- HRV · RMSSD
- Beat-to-beat variability: accumulated fatigue and stress, against your normal.
- Automatic cuff + PTT
- Blood pressure, plus a cuffless estimate from pulse transit time.
- Bluetooth glucometer
- Blood glucose straight into your history.
- EDA
- Electrodermal activity in the handles: acute stress.
- Load cells
- Grip strength, to track muscle loss in microgravity.
- NDIR CO₂ + cabin air
- CO₂, temperature, humidity and pressure against NASA-STD-3001.
- Dosimeter
- Radiation dose rate and accumulated dose, linked to live space weather.
- RFID
- Identifies each astronaut by their card.
Try it here
Get a check-up
in 10 seconds.
Press and hold the sensor as if you were gripping the handles. XPaze measures, compares against the thresholds and explains it in one sentence. Here it’s a simulation; in the app, with the station or by hand, it’s real.
04 — Your normal
Every body
is different.
XPaze gradually builds your baseline: how your body normally behaves. So a reading isn’t only compared with the population average, but with you.
Population range
Your baseline
Your reading
Day 58: 84 bpm. Normal for the population. Not for you.
An alert without an explanation is of little use.
XPaze says what it saw and why it raised an alert, in plain sentences. It doesn’t label or diagnose: it detects the change, explains it and leaves the decisions to professionals.
- Compares you with you, not with others
- Rules out what exercise explains
- Only alerts if the pattern persists
07:42
XPaze
Day 58 · morning check-up
Keep an eye on it
Several signals outside your normal
- Resting heart rate above your baseline
- Temperature slightly higher than usual
- No physical activity to explain it
- Ongoing for 18 minutes
“Your resting heart rate has been clearly above usual for 18 minutes without any exercise. Rest and repeat the check-up in an hour.”
05 — The mind
The mind
travels too.
Months of isolation, confinement and disrupted sleep also weigh on mood and attention. XPaze applies the same idea: your own normal, sustained changes and a clear explanation. No diagnoses.
Listens and answers by voice
Meet Paze
Your on-board psychologist.
Paze talks with you by voice, knows your data (sleep, heart rate, check-ups, cabin air and space weather) and remembers what you talk about from one session to the next. It doesn’t diagnose: it keeps you company, suggests evidence-based techniques and, if something is serious, puts you in touch with a person.
Talk to PazeThree sliders a day: how you feel, how much energy you have and how much tension you notice.
A short reaction test. Lapses and slowness say a lot about fatigue.
The watch provides sleep hours and quality; you add the workload you perceive.
Heart rate variability and resting heart rate are compared with your own, not with anyone else’s.
A few short questions about living together and isolation, to notice when the mood on board changes.
What you write never leaves the device. Nobody else reads it.
Short breaks and exercises, suggested from your pattern over the last few days.
By default, the crew medical officer only sees an overall traffic light.
Try it
Test your reaction.
Five stimuli. Tap as soon as the circle lights up.
Try it
Breathe for a minute.
Breathe in for 4 seconds and out for 6. Follow the circle.
06 — Autonomy
Built for when
Earth is slow to answer.
The farther a mission goes, the more autonomy matters. XPaze processes the essentials on the spacecraft itself, with no cloud and without waiting for anyone.
Right now
—
is how long a message takes from Earth to Mars, — million km away. Round trip: —.
Calculated in your browser from the real positions of the planets today.
Live
Space weather, right now.
—
Whenever possible, biometric data never leaves the spacecraft.
The station creates its own network: the analysis and the app work without internet.
Only the essentials are synced to Earth, not everything.
Who sees what can be restricted in each phase of the mission.
07 — NASA data
The NASA data
we use.
In all honesty: what XPaze queries live and what underpins its thresholds and design. Every figure has a source.
LiveUnderpins
DONKI · space weather
NASA Community Coordinated Modeling Center · api.nasa.gov
Real alerts from the last 7 days, assessed with fixed rules for the mission environment:
- Solar energetic particles (48 h): red outside the magnetosphere, yellow in low Earth orbit.
- Flare ≥ M5 (24 h): watch, protons may follow.
- Geomagnetic storm Kp ≥ 7 and radiation belt: Earth orbit.
See it working in the “Autonomy” chapter.
api.nasa.gov ↗Earth–Mars delay
Checked against JPL Horizons (NASA/JPL)
XPaze computes the positions of Earth and Mars in your browser from their orbital elements, and from them the light time.
11.0 min on 14 Nov 2026, matching JPL Horizons.
JPL Horizons ↗NASA-STD-3001 · habitability
Crew Health and Performance standard, Vol. 2
- Comfort [V2 6013]: 20–25 °C and 30–60 % humidity.
- Health [V2 6012]: 18–27 °C and 25–75 %.
- Total pressure [V2 6006].
- CO₂ ≤ 3 mmHg averaged over 1 h [V2 6004]. Station v2 measures it with an NDIR sensor (simulated in the app).
These are the limits of the cabin traffic light.
ECLSS fact sheet ↗Human Research Program
Official health risks for space missions
Each XPaze indicator maps to a risk from the program:
- Heart rate and blood pressureCardiovascular
- OxygenMedical Conditions · Hypoxia
- GlucoseFood and Nutrition
- Sleep and reactionSleep
- Mood (PHQ-2)BMed
- Living togetherTeam
- Space weatherSpace Radiation
NASA OSDR
Open Science Data Repository
- OSD-569 · Inspiration4 (Overbey et al., Nature 632, 2024): each astronaut responds differently to spaceflight. That is why XPaze compares you with your own baseline.
- Environmental Data App: real temperature, CO₂ and humidity from the ISS cabin, as a reference for realistic values.
PVT-B · reaction test
Basner, Mollicone and Dinges · Acta Astronautica, 2011
The brief version of the vigilance test used in ISS research.
> 355 ms counts as a lapse, the validated threshold.
Paper ↗Real physiological data from astronauts is not public: it is only available through approved requests. That is why the demo crew is simulated, using published parameters.
08 — Prototype
What already works.
And what comes next.
It is not a certified medical device. It is proof that the idea works.
Built
- Station v2 simulated beat by beat in the cloud: ECG, temperature, breathing, HRV, QTc, blood pressure, glucose, stress, grip, CO₂ and radiation. Heart rate, HRV and rhythm are computed from the beats.
- App with a 5-step guided check-up: heart rate and oxygen (sensor or by hand), blood pressure, glucose, mood and sleep, and warning signs.
- Traffic light with fixed, citable thresholds (NEWS2, ACC/AHA, ADA, PHQ-2, AASM and spaceflight habitability standards). The AI explains it; it never changes a color.
- Paze: a psychologist by voice and text, with memory between sessions and your data as context.
- Live space weather, assessed for the mission environment.
- Real data from a Galaxy Watch via Samsung Health, with the XPaze Link Android app.
Simulated, and what comes next
- Simulated: the station v2 sensors, the crew and the mission environment.
- Next: build station v2 with these sensors and test it in analog missions.
- Next: weeks-long trends with a dedicated model.
- Next: validate the rhythm detection against clinical ECGs.
Built for space.
Useful on Earth too.
Isolation + scarce resources + spotting a problem fast
Polar basesResearch stationsShipsSubmarinesExpeditionsRural areasEmergenciesPlaces without a stable connection
Monitor. Understand. Anticipate.
Future missions won’t just need autonomous spacecraft. They will need tools that look after the people traveling inside.