Blood Flow Restriction (BFR) is a hot topic in physical therapy right now. Even though it has been around since the 1960s, there has recently been a surge in BFR research that supports how this technique can improve patient outcomes.
In 1966, 18-year-old Yoshiaki Sato had an epiphany after standing up from a “seiza” position at a funeral – his legs felt as if they had been through a fatiguing workout. After a catastrophic ankle injury skiing in 1973, he was in a long leg cast for six weeks. During his immobilization, Sato initiated the first “blood flow restriction training” by using belts and performing isometric exercises. Doctors were shocked when his leg was not atrophied or tender when the cast was removed. Throughout the 1970s, Sato investigated restriction training on himself and other Japanese body builders. During the 1980s, Sato started his own personal training clinic, introducing “occlusion training,” quickly catching on with European body builders as well. In the 1990s, Sato started doing formal research and developed “KAATSU” pneumatic bands. “Ka” means “additional” and “Atsu” means “pressure.” Use of Sato’s formal KAATSU equipment requires formal apprenticeship in Japan, so many Westerners have made use of various wraps, straps, bands, belts, blood pressure cuffs and surgical tourniquets in attempt to replicate Dr. Sato’s results.
BFR rehabilitation has gained more wide-spread popularity as it started being used for military personnel who were struggling to improve muscle strength and size in their injured limbs after blast injuries, amputations and limb salvage procedures. When attempting to lift heavy weights, they were significantly limited due to pain and weakness. With the help of BFR training, they were able to achieve their strengthening goals using lighter weights. Olympic athletes have since caught on to BFR taking workouts to the point of fatigue without the heavy lifting. Now BFR is becoming more popular in outpatient physical therapy as well, as it can help minimize the effects of limited extremity use.
During BFR training, a patient or athlete works out with a narrow, elastic band around the upper portions of the exercising arm or leg. This band partially restricts venous blood flow but does not affect arterial inflow to the extremity. Doing this produces a systemic response comparative to heavy weight training. Performing high repetitions of a particular exercise while wearing the elastic band and using light weights will allow the patient to receive the strengthening benefits of heavy lifting without the stress to tissues that may be healing from a recent injury or surgery.
In a nutshell, exercising with lighter weights while using blood flow restriction causes a local disturbance of homeostasis, as the working muscle does not receive enough blood flow to sustain contractions. This creates a release of autonomic and anabolic hormones that move throughout the body. This systemic response augments the local response, causing increased protein synthesis. Because little damage is done to the soft tissue by avoiding heavy weight lifting, improvements in strength and endurance can come quickly. All tissues both proximal and distal to the blood flow restriction bands can benefit from these effects.
BFR training can be performed in a regular fitness routine, but can also be safely performed under the supervision of trained professionals in outpatient physical therapy clinics. BFR can safely be used on patients in the acute phase of rehabilitation following most upper or lower extremity surgeries, including ACL reconstruction, meniscectomy, hip/knee replacement, rotator cuff repair or any tendon repair. Research has shown BFR can minimize loss of muscle mass and decrease bony healing time during the early immobilization phases, allowing patients to improve both muscle size and strength without the stress of heavy lifting on healing soft tissue. Patients with osteoarthritis, rheumatoid arthritis, osteopenia or osteoporosis may also benefit from BFR. Additionally, BFR has been utilized after strokes or spinal cord injuries and with athletes who want to improve performance.
Research has shown that BFR is not only comfortable for the patient, but also safe and effective when exercises are performed appropriately and when equipment is monitored by a trained blood flow restriction professional. This service is now available to be performed by trained clinicians at select Athletico clinics. If you are interested in learning more about BFR, click the button below to request an appointment.
The Athletico blog is an educational resource written by Athletico employees. Athletico bloggers are licensed professionals who abide by the code of ethics outlined by their respective professional associations. The content published in blog posts represents the opinion of the individual author based on their expertise and experience. The content provided in this blog is for informational purposes only, does not constitute medical advice and should not be relied on for making personal health decisions.
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