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Capillary

What is a Capillary?

A capillary is the smallest type of blood vessel in the human body, forming a dense network throughout the tissues that connects the arterial and venous systems. Capillaries are typically just one cell thick, which allows oxygen, nutrients, and waste products to pass between the blood and surrounding tissue. This thinness also makes them the blood vessels most vulnerable to physical trauma.

Capillaries and Bruising in Martial Arts

In contact sports and martial arts, bruises form when capillaries beneath the skin are ruptured by impact, pressure, or friction. Blood leaks from the damaged vessel into the surrounding tissue, producing the discoloration visible on the skin's surface. The bruise fades as the body reabsorbs the leaked blood over several days.

Grapplers and BJJ practitioners are particularly familiar with capillary-related bruising due to the sustained pressure, gripping, and friction involved in close-contact training. Common bruise locations include the inner arms, calves, neck, and ribs, each corresponding to positions and techniques where concentrated force is applied to the skin and underlying tissue.

With consistent training, the body adapts. Capillaries subjected to regular low-level stress become more resilient over time, which is one reason experienced practitioners tend to bruise less frequently than beginners. Nutrition also plays a role: adequate intake of Vitamin C supports collagen production in blood vessel walls, while sufficient iron and overall caloric intake support healing after damage occurs.

Capillaries and Long-Term Training

Repeated capillary damage without adequate recovery can slow healing and cause bruises to layer on top of each other. This is more common in athletes who undertrain recovery relative to training volume, or who have nutritional deficiencies that impair the body's repair processes. Monitoring bruise recovery time is a practical signal of overall recovery quality for martial artists in high-contact disciplines.

Related article: The Gentle Art Leaves Marks: Understanding Bruising in BJJ and Why It Gets Better

Life is constant movement - rhythmic as well as random. Life is continual change, not stagnation. Instead of choicelessly flowing with this process of change, many 'masters', past and present, rigidly subscribe to traditional concepts and techniques of the art, solidfiying the everflowing, dissecting the totality.
Davis Miller

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Other Glossary terms

Capillary
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