Specifically, the answer to this direct question is not known yet. However, it depends on what the stimulus for tendon adaptation is and that is not known for sure, either. If the trigger is large absolute force loads across the tendon, then BFR will be minimally effective. On the other hand, if the trigger is “number of loads” that could be light, then BFR will work to improve tendon strength. There are a couple of studies on this topic with mixed results.However, with literally millions of BFR sessions performed all over the world with significant gains in muscle size and strength, we do not have any tendon injuries reported. In contrast, abuse of anabolic steroids, can build big strong muscle, but also weaken tendons, sometimes resulting in catastrophic tendon failure and rupture. Further, we do know this builds muscle and bone and tendons are the structure in-between, so it is logical to expect tendons are strengthened, as well as, the muscle and bone.