Can a group change the results of your exercise and health? The concept appears too simple to be true. AA technique borrowed from 1960s Japan could change the way we think about fitness — for everyone from cancer survivors to astronauts, according to Concordia researchers.
A band or cuff can be a game changer
Imagine getting the cardiovascular benefits of exercise while doing something gentle like dancing in your living room. This isn’t wishful thinking—it’s a growing body of research coming out of Andreas Bergdahl’s lab at Concordia University.
Andreas Bergdahl, an associate professor in the Department of Health, Kinesiology and Applied Physiology and his group of students are studying blood flow restriction (BFR) training—a technique that uses gentle external pressure on the limbs to trick the body into thinking it’s working much harder than it really is.
The results turn some long-held assumptions about exercise on their head.
The Problem with “Just Work Harder”
For decades, the gold standard for improving cardiovascular fitness has been VO₂ max—a measure of how efficiently the body uses oxygen. A higher VO₂ max means a stronger heart, better endurance and a significantly reduced risk of cardiovascular disease. catch? Increasing it usually requires sustained and high-intensity training.
For a healthy 25-year-old, this is the recipe. For someone recovering from surgery, managing Parkinson’s disease, battling chronic fatigue from COVID, or simply navigating the physical realities of turning 70, this is often an impossible request.
“BFR can replicate many of the physiological effects of high-intensity exercise without requiring the same workload,” says Bergdahl. “Recent research from our lab shows just how effective this approach can be.”
Doing less is doing more
The mechanism is very simple. Using a cuff or band to partially restrict blood flow to the arm or upper thigh forces the body to recruit more muscle fibers and produce energy less efficiently – at a fraction of the effort to produce the same metabolic stress as a strenuous session.
The result: meaningful adaptation of everyday movements such as walking, squatting or even sitting up from a chair.
PhD candidate Daniela Presta tested this with adults in their mid-70s. Over just five weeks of twice-weekly, home-based resistance training combined with BFR—sessions conducted entirely online—participants showed significant improvements in cardiovascular fitness, as measured by a simple sit-to-stand test. Five weeks. Twice a week. At home.
Fellow PhD student Emma Chen continues this work, drawing BFR into dance-inspired at-home routines aimed at improving balance and reducing falls. His 12-week program shows that adding BFR to gentle movement can significantly improve results—without increasing physical stress.
For participants with disabilities or social isolation, the approach offers something unique: to practice which is both affordable and really effective.
From cancer recovery to space
What started as a tool for older adults has possibilities beyond that.
In Bergdahl Laboratory, BFR is studied in a wide range of populations. For people recovering from cancer or living with conditions such as Parkinson’s disease or chronic COVID-19 where fatigue makes traditional exercise impossible – early findings suggest that BFR can help restore strength and functional capacity and, in some cases, alleviate persistent symptoms. PhD student Ariel Rousseau is investigating its applications for postpartum women.
At the other end of the spectrum, the lab is investigating whether BFR can speed up recovery from tendonitis in Concordia varsity basketball players, collaborating with the Université du Québec à Montréal and Canadian Space Agency They are investigating how it can maintain muscle strength for astronauts before and after space flight. The physics of microgravity and the physiology of muscle atrophy make the BFR a viable candidate for life beyond Earth.
A 60-year-old idea whose time has come
The technique at the heart of Bergdahl’s lab is not new. KAATSU – Japanese for “extra pressure” – was developed in the 1960s by Yoshiaki Sato, who first tried it on himself after a leg injury. What began as a radical assumption about muscle tension and retention eventually evolved into a precise system of compression and deflation cycles that is now used by researchers and clinicians around the world.
Today, KAATSU equipment can cost thousands of dollars – a barrier that risks keeping interests within elite sports and well-funded clinics. Bergdahl’s lab is working to change that, and is testing calibrated elastic bands as an affordable alternative that participants can use safely at home.
“With the right approach,” says Bergdahl, “we can make the benefits of physical activity available to a wider population. This has huge implications for public health.”
That’s a bold claim — and early science suggests it might just be possible.
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Research in sh Bergdahl Laboratory in the Department of Health, Kinesiology and Applied Physiology at Concordia University, Montreal.
