Tolerance to Intermittent vs. Continuous Blood Flow Restriction Training: A meta-Analysis

Area of Science:

• Exercise Physiology
• Rehabilitation Science
• Sports Medicine

Background:

• Low-load blood flow restriction training (BFRT) is recognized for its benefits in strength gain.
• Its application in rehabilitation is explored due to limitations with heavy loads.
• Low-load BFRT may be less tolerated than heavy-load resistance training.

Purpose of the Study:

• To determine if intermittent cuff deflation during BFRT improves exercise tolerance.
• To assess if intermittent cuff deflation compromises strength gains compared to continuous BFRT.

Main Methods:

• A systematic review and meta-analysis of randomized controlled trials (RCTs) were conducted.
• Searched four databases for studies comparing intermittent versus continuous BFRT in adults.
• Nine studies were identified; six were included in the meta-analysis focusing on exercise tolerance and strength.

Main Results:

• No significant difference in the rate of perceived exertion between intermittent and continuous BFRT (SMD -0.06, 95% CI -0.41 to 0.29, p=0.73).
• Subgroup analysis excluding biased studies suggested a potential, though not statistically significant, benefit for intermittent BFRT (SMD -0.42, 95% CI -0.87 to 0.03, p=0.07).
• No significant differences in strength gain were observed between the two methods.

Conclusions:

• Intermittent cuff deflations during rest intervals of BFRT do not enhance exercise tolerance.
• The strategy of intermittent cuff deflation does not appear to compromise strength gains.
• Current evidence does not support intermittent BFRT as a superior method for improving tolerance in rehabilitation.