Peter Attia· MD
it helps to understand that this is a very acute response in other words we're restricting blood flow for minutes not for hours
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
it helps to understand that this is a very acute response in other words we're restricting blood flow for minutes not for hours
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i think the safety profile overall is comparable to that of high load exercise or traditional exercise
Now, the thing is is it better than light-load training? Well, light-load training, I should've mentioned this, and you've done it, you say, it's not fun for a lot of people because you get metabolic acidosis. Again, you have to train hard and you get this burn. And when you're doing it over 30 repetitions, let's say, and it's a 3-second rep, that's a 90-second set. Let's see...70, 80, 90 seconds is a long period of time where you're experiencing that burn, quote unquote. Whereas, if you're doing, let's say, a leg extension or a biceps curl, with blood-flow restriction, you're cutting the time, you're still using the lighter loads, meaning that you're not putting as much joint stress on, but you're cutting the time of that set and, thus, somewhat reducing the discomfort. Is it necessarily better, from a result standpoint, than lighter-load training? There's been no evidence that we've had, certainly that I've seen on that. But there is some hypotheticals...I can make cases for certain, like, the hypoxia-inducible factor is a substance that is thought to increase the hypertrophic response, intracellular hypertrophic response. So, there are some logical rationales but we don't have any longitudinal evidence showing it's better. And like I said, the limitation to it is the inability to do it, it's only specific to the extremities. There are some potential...I want to at least bring up the fact, in general, it's shown to be safe but...and people that have blood-pressure issues, I'm not completely convinced there might not be potential issues. And the other thing that I want to point out too is that the research we have is in very controlled environments with researchers that know what they're doing. You get people, they just, like, put a cuff on, their arm starts turning purple where you can really do some damage if you're not doing this properly. So, you have to be cognizant of how to go about doing it if you're going to employ BFR.
You get people, they just, like, put a cuff on, their arm starts turning purple where you can really do some damage if you're not doing this properly.