180. HIT WITH BLOOD FLOW RESTRICTION (BFR) INDUCES SIMILAR ADAPTATIONS WITH LESS MECHANICAL LOAD

Blood Flow Restriction Training (BFRT) is a training technique that involves partially restricting blood flow to the exercising limbs, typically using inflatable cuffs or elastic bands.

This occurs because the pressure applied by the cuffs or bands partially occludes blood vessels, reducing blood flow to the working muscles. As a result, oxygen delivery is decreased, creating a local hypoxic environment, while the removal of metabolic by-products is also impaired. The combination of reduced oxygen availability and metabolite accumulation increases metabolic stress, which may stimulate cellular adaptations despite the use of much lower mechanical loads (i.e., lower power outputs during cycling).

Most research on blood flow restriction training (BFRT) has focused on its use in resistance training to enhance muscle hypertrophy. But what about endurance training?

Does an effort-matched (rate of perceived exertion, RPE) high intensity training (HIT) microcycle performed with blood flow restriction at a lower power output produce similar improvements in endurance performance as the same HIT microcycle performed without BFR at a higher power output in well-trained cyclists?

A hot off the press (2025) study by Zambolin and Colleagues (Manchester Metropolitan University Institute of Sport, UK) on Journal of Applied Physiology tried to answer this question. (1)

That could be useful in some situations, such as:

• during training periods that already include high mechanical stress from heavy strength training or high-torque cycling sessions, BFR could help reduce the overall mechanical load while maintaining the metabolic stimulus.

• It may also be valuable for athletes returning from a lower-limb injury, allowing them to preserve endurance fitness while minimizing stress on the recovering tissues.

Let’s see the data.