The only important safety point is that B Strong BFR BandsTM can not occlude arterial inflow in an extremity up to the limit of the hand pump (500 mmHg) when instructions and guidelines are followed. All complications, or negative side effects with BFR occur as a result of occluding the arterial inflow into a limb. Since B Strong BFR BandsTM are incapable of occluding (up to the limit of the pump) when used correctly, they are eminently safe.
The effectiveness of B Strong BFR TrainingTM is not about what percentage of arterial flow is restricted, but rather the robustness of the metabolic crisis signal occurring in the working muscle and being sent to the brain. The “robustness” of the metabolic crisis signal is a function of the amount of venous outflow restriction that prevents recovery in the working muscle, the duration of that metabolic crisis signal and the percentage of the body’s muscle mass sending that signal.