Pressotherapy uses air-filled chambers that inflate in sequence from your feet upward, mimicking the body's natural circulatory pump. This pushes blood and lymph fluid back towards the heart, reducing swelling, speeding recovery, and improving circulation.
The basic mechanism
Every pressotherapy device - whether you call them recovery boots, compression boots, or leg massagers - works on the same core principle: sequential pneumatic compression.
An electric air pump pushes air into inflatable chambers built into sleeves that wrap around your legs (or arms, or waist). These chambers don't all inflate at once. Instead, they inflate one after another in a wave-like pattern, starting at the furthest point from your heart (usually your feet) and moving upward towards your hips.
Think of it like squeezing a tube of toothpaste from the bottom up - except the tube is your leg, and you're squeezing blood and lymph fluid back towards the heart.
Step by step
Wrap and seal
You slide your legs into the sleeves (or boots) and zip them up. The chambers sit snugly against your skin or over clothing.
Sequential inflation
The pump inflates the lowest chamber first (around your feet or calves), then the next one up, creating a wave of compression moving upward.
Release and repeat
Once all chambers are full, the system deflates and starts again. This cycle repeats for 20-30 minutes per session.
What's happening inside your body
The sequential compression creates several physiological effects:
- Venous return - The upward squeezing action pushes deoxygenated blood back to the heart more efficiently, similar to what your calf muscles do when you walk. This is why pressotherapy is sometimes called a "mechanical calf pump."
- Lymphatic drainage - Your lymphatic system doesn't have its own pump (unlike blood, which has the heart). It relies on muscle contractions and movement to push lymph fluid through your vessels. Pressotherapy provides that external squeeze, helping clear metabolic waste, excess fluid, and inflammatory molecules.
- Reduced inflammation - By flushing out inflammatory markers like interleukin-6 and creatine kinase more quickly, pressotherapy can reduce the soreness and swelling that follows intense exercise.
- Improved oxygen delivery - Better venous return means more efficient gas exchange in the lungs, which means more oxygenated blood reaching your muscles on the next cycle.
Air chambers: how many matter?
The number of air chambers in a device directly affects the quality of the compression wave:
3-4 chambers
Found in budget devices (under £100). The compression wave feels more like distinct squeezes with gaps between them. Still effective, but less smooth.
5-6 chambers
Found in mid-range to premium devices. The wave feels smoother and more continuous, closer to what you'd experience at a clinic. More chambers = more precise pressure gradient.
Pressure settings
Most home devices offer adjustable pressure from around 20 mmHg to 250 mmHg. For context:
- 20-60 mmHg - Light compression. Good for relaxation and light circulation support.
- 60-120 mmHg - Moderate. The sweet spot for most users - effective for recovery and circulation without discomfort.
- 120-200+ mmHg - Firm to intense. Used by athletes for deep muscle flushing after hard training. Can feel quite tight.
Start low and increase gradually. The right pressure should feel like a firm hug, not a vice grip. If you feel numbness, tingling, or pain, reduce the pressure immediately.
How it differs from static compression
Regular compression socks and stockings apply constant, even pressure. They support your circulation passively - they don't actively push fluid. Pressotherapy is dynamic: it actively squeezes and releases in sequence, creating a pumping action that moves fluid far more effectively than static pressure alone.
This is the same reason intermittent pneumatic compression (IPC) devices are used in hospitals to prevent deep vein thrombosis in bed-bound patients - the active pumping is significantly more effective than compression stockings alone.