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How does it occur?
We have a non-stretchy membrane encasing our muscles called the Fascia. Putting demand on the muscle increases the blood flow since the muscle can increase up to 20% in volume and the fascia is not elastic it gets tight inside constricting the blood flow.
This constriction leads to intense pain as well as an under performing limb and there may also be numbness or weakness.
All things you do not want at very high speed on a motorcycle.
However, it is not likely to cause permanent damage to the limb.
How is it treated?
The only real option is surgery called a Fasciotomy.
A slit is made in the Fascia membrane to relieve the pressure.