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the lab

Four small models of the physics underneath a session. Touch them. Nothing here is a claim — it’s the plumbing, rendered honestly.

01

the cell, fed

Supply and rate. Pressure brings more oxygen to the door; light speeds up the machinery inside. Turn them on and watch the energy rise.

supply low reaction rate baseline cellular energy —
O₂ molecule mitochondrion nir photon · ~810 nm ATP

Pressure raises the supply of oxygen; light raises the rate the cell can use it — near-infrared lands on cytochrome c oxidase and electrons move faster down the chain. Both at once make the most ATP. What that buys you isn’t a number on a screen — it’s more cellular energy, and the steadiness you tend to feel later.

02

pressure & the plasma

The red blood cells are already full. Slide the pressure up and watch where the extra oxygen actually goes.

red cells ~100% full plasma oxygen ×1 the far corner dark
1.0 ATA
red blood cell (full) free O₂ in plasma tissue the blood leaves short

Hemoglobin’s already full — it can’t hold more, so the red cells don’t change. Pressure fills the plasma instead, dissolving roughly ten times more oxygen into the fluid your blood cells ride in. And plasma is what reaches the corners blood flow leaves short. We measure that reach — the point is the corner lighting up, not the number.

03

more is not better

Biology runs on right amounts. Slide the input up and watch the benefit rise, peak, and then — past a point — fall.

input low benefit none yet
low
too little right amount too much

Too little does nothing. The right amount helps. Too much stops helping — and can cost you. There’s no unit on that axis on purpose; the shape is the truth, not the digits. We measure, so you stay in the band that works for you.

04

the window

There’s a band of light your body lets through. Slide across the spectrum and watch how deep each color actually reaches.

wavelength 810 nm reach centimeters band the window
810 nm

Below the window your skin soaks the light up; above it, the water in your tissue stops it. In between — roughly 650 to 1350 nm — light slips past the surface and reaches centimeters down, to the mitochondria waiting to use it. That band is why the light works at depth instead of just warming your skin.

nir science hbot science glossary