Blood Flow Restriction training may seem like a recent innovation in the United States, but its roots go back to Japan in 1966.  Dr. Yoshiaki Sato spent years developing the method that became KAATSU, began teaching it in Tokyo in the 1970s, and later participated in university and clinical research that helped form the foundation of today's broader BFR category.

The history matters because modern Blood Flow Restriction, or BFR, is not one single method. Today's equipment and protocols developed from—and in many cases diverged from—a much older Japanese approach.

This is the timeline.

1966 — Yoshiaki Sato Notices Something at a Buddhist Funeral

Yoshiaki Sato, then a teenager, attended a Buddhist funeral in his hometown and sat in seiza posture with his legs folded beneath him for an extended period.

As he sat, Sato noticed that his calves felt hard and pumped—the same way they did at the end of a long workout.

This is not an exaggeration of the founding moment. His calves were the inspiration that ultimately led to the contemporary BFR market.

Sato decided to figure out why his calves had reacted that way.

1966 to 1973 — Seven Years of Self-Experimentation

Sato spent the next seven years experimenting on his own body with bicycle tubes, surgical tubing, judo belts, and ropes in an effort to reproduce the pumped feeling he had experienced in his calves.

He nearly caused himself serious harm on more than one occasion because he did not yet understand physiologically what was happening when he tightened tubes in different places around his body.

Sato recorded which pressures, durations, and movements appeared to produce muscle growth, which produced no effect, and which caused injury.

By 1973, he had developed a wide number of KAATSU protocols and applications and was teaching it to athletes and people of different ages at his training center in Tokyo.

1980s — KAATSU Moves Into Broader Clinical Use

Over time, Sato refined the equipment, moving from rubber tubing to wider and more comfortable elastic bands.

He began working with trainers, coaches, doctors, disabled people, and competitive athletes in Tokyo.

By the late 1980s, Sato had documented thousands of cases involving people using low-load resistance exercise under his protocols, including older and disabled individuals seeking to build or maintain muscle.

1990s — KAATSU Research Begins at the University of Tokyo

Sato began research at the University of Tokyo in 1994 with Japanese sports physiologists.

That work ultimately contributed to a seminal paper published in the Journal of Applied Physiology in 2000: Effects of resistance exercise combined with moderate vascular occlusion on muscular functions in humans.

The paper documented muscular adaptations in healthy young men using KAATSU bands and introduced the KAATSU methodology to a much wider scientific audience outside Japan.

Subsequent BFR research programs in the United States and Europe frequently cited this paper as foundational work in the field.

2000s to 2010s — Clinical Research Expands and the Modern BFR Market Emerges

By the early 2000s, Sato and collaborating cardiologists had observed important physiological outcomes among KAATSU users, including changes associated with the elasticity of vascular tissue.

Between 2004 and 2014, more than 12,000 patients—including more than 2,000 cardiac patients at the University of Tokyo Hospital—underwent KAATSU training under the care of a team of cardiologists.

The evidence and safety profile were considered strong enough for the method to be incorporated into ongoing cardiac rehabilitation programs. By 2010, the total number of patients rehabilitated using KAATSU was in the tens of thousands.

During the following years, American researchers and practitioners increasingly began developing and studying their own BFR approaches.

Jeremy Loenneke at the University of Mississippi published extensively on BFR mechanisms and protocols that differed from the KAATSU protocols used by cardiologists in Japan.

By around 2014, BFR products using different equipment and protocols started to enter the American market. Systems such as the Delfi Portable Tourniquet System for Blood Flow Restriction helped establish an approach based on equipment and pressure methods different from those used in KAATSU.

The category that came to be known broadly as BFR was now distinct from, but historically descended from, KAATSU.

KAATSU and BFR Had Begun to Diverge

The distinction is important because marketing often blurs the differences between systems.

KAATSU pioneered the original method of modifying blood flow in the limbs to produce specific physiological outcomes.

Other products within the broader BFR category use different equipment, different pressure protocols, and different set-and-repetition structures.

BFR therefore does not describe one product, one protocol, or one approach. Some products approximate aspects of the original method. Others have diverged substantially.

2020s — BFR Adoption Widens

During the 2020s, BFR use expanded in the United States and Europe across special forces, professional sports, longevity clinics, and, particularly, physical therapy.

The American Physical Therapy Association has also addressed Blood Flow Restriction therapy in its professional resources.

Peer-reviewed publications across the broader BFR category now number more than a thousand.

KAATSU equipment remains in use internationally. Dr. Sato continues to train clinicians, while KAATSU is sold and certified through KAATSU Global in the United States, Europe, Asia, and other markets.

Why the History of BFR Training Matters

The BFR timeline matters because it changes how modern research should be interpreted.

A study published today with a title such as “Effects of BFR on Muscle Hypertrophy” is generally examining a category whose underlying concept can be traced to a method first practiced in 1966.

KAATSU was then used among people of different ages for decades before the first major English-language scientific paper appeared. Japanese physicians were also using and studying the method well before American BFR companies entered the market.

The science has a longer history than the modern BFR marketplace.

That distinction matters.

When reading BFR research, it is important to identify the equipment, pressures, protocols, and methodology actually used rather than assuming that every study labeled “BFR” is studying the same intervention.

Frequently Asked Questions About the History of BFR

Who invented Blood Flow Restriction training?

The method that gave rise to modern Blood Flow Restriction training was developed by Dr. Yoshiaki Sato in Japan. He envisioned KAATSU and began experimenting with what eventually evolved to the BFR market in 1966.

When was KAATSU developed?

Dr. Sato began experimenting in 1966 and spent approximately seven years developing the method. By 1973, he had established formal KAATSU protocols and applications that he began teaching in Tokyo.

When did scientific research on KAATSU begin?

Dr. Sato began research at the University of Tokyo in 1994. A major paper describing resistance exercise combined with moderate vascular occlusion was published in the Journal of Applied Physiology in 2000.

Is modern BFR the same as KAATSU?

No Modern BFR is a broad category encompassing different cuffs, pressures, equipment, and exercise protocols. KAATSU is the original Japanese method from which much of the broader field developed, but many modern BFR systems have diverged from its equipment and protocols.

Where to Read More About the Origins of BFR

For readers who want to go deeper into the history, the 2022 letter by Drs. Sato and Nakajima is a useful starting point.

The 2000 Journal of Applied Physiology paper, Effects of resistance exercise combined with moderate vascular occlusion on muscular functions in humans, remains a foundational scientific text.

We also maintain an archive of Steven Munatones' long-form answers covering many of the historical, physiological, and practical questions surrounding KAATSU.

The method has a long history. KAATSU is estimated to have been practiced approximately 30 million times since its origins in 1966.

Understanding that history makes it easier to understand where today's BFR research and products came from—and why different systems carrying the BFR name should not automatically be treated as equivalent.

Want to learn more about KAATSU and Blood Flow Restriction? Reach out to our team at info@kaatsu.com for further guidance on equipment, protocols, research, and use.