Blood Flow Restricted Exercise and Discomfort: A Review

Area of Science:

• Exercise Physiology
• Sports Science
• Rehabilitation Medicine

Background:

• Blood flow restriction (BFR) exercise combines low-load exercise with arterial inflow restriction and venous outflow blockage.
• This method is effective for increasing muscle size and strength due to resultant ischemia.
• However, a significant limitation is the discomfort experienced during BFR exercise.

Purpose of the Study:

• To review existing literature on factors influencing discomfort during blood flow restriction exercise.
• To identify strategies for manipulating these factors to reduce exercise-induced discomfort.
• To suggest future research directions for optimizing BFR protocols.

Main Methods:

• A comprehensive literature search was conducted to identify studies investigating blood flow restriction and discomfort.
• Thirty-eight relevant studies were included in the review.
• Analysis focused on factors such as applied pressure, cuff width, cuff material, sex, and training to failure.

Main Results:

• Blood flow restriction exercise elicits greater discomfort compared to non-BFR exercise.
• Chronic BFR use may improve tolerability, though discomfort may remain elevated.
• Discomfort can be attenuated by using lower applied pressures and avoiding training to task failure.

Conclusions:

• Proper cuff sizing and individualized applied pressure are key to attenuating discomfort during BFR.
• Reducing discomfort may enhance adherence to BFR-based exercise and rehabilitation programs.
• Further research is needed to fully understand and mitigate BFR-induced discomfort.