Effects of Blood Flow Restriction Training on Muscle Strength and Hypertrophy in Untrained Males: A Systematic Review and Meta-Analysis Based on a Comparison with High-Load Resistance Training.
Level 1 - systematic review of randomized trials
Systematic review and meta-analysis of clinical trials evaluated with the Cochrane risk of bias tool.
PubMed 39598240 · doi:10.3390/life14111442
What was done
Authors conducted a systematic review and meta-analysis comparing low-load resistance training with blood flow restriction (LL-BFR) versus high-load resistance training (HL-RT) in untrained males. Nine databases (including PubMed, Embase, Cochrane Library, Scopus, CNKI, and Wanfang) were searched through July 2024. Risk of bias was evaluated using the Cochrane tool. Standardized mean differences (SMD) were calculated for muscle strength and hypertrophy, accompanied by subgroup analyses on modulating variables such as pressure prescription, cuff inflation mode, and session volume.
What was found
HL-RT produced superior muscle strength gains compared to LL-BFR overall (SMD = -0.33, 95% CI: -0.49 to -0.18, p < 0.0001). However, subgroup analyses showed that LL-BFR achieved comparable strength gains to HL-RT when using individualized cuff pressure (SMD = -0.07, p = 0.56), intermittent cuff inflation (SMD = -0.07, p = 0.65), or higher numbers of training sessions (SMD = -0.12, p = 0.30). For muscle hypertrophy, there was no significant difference between LL-BFR and HL-RT (SMD = 0.01, p = 0.94), a finding that remained consistent across subgroup analyses.
Why it matters
This review shows that while conventional heavy lifting remains the benchmark for maximizing maximal strength, low-load BFR is equally effective for building muscle mass in untrained males. It supports LL-BFR as a viable alternative for hypertrophy when heavy loads are contraindicated due to joint pathology or injury.
Limits
The abstract does not disclose the total number of included studies, overall participant count, or confidence intervals for the hypertrophy analysis. Findings are restricted to untrained males and cannot be directly generalized to trained athletes, females, or clinical rehabilitation populations.
Cited by
- supports Blood flow restriction training using light loads (20% to 30% 1RM) produces muscle hypertrophy similar to traditional resistance training.
- partial Blood flow restriction training produces strength gains similar to light-load training without BFR, but less strength gain than heavy-load training.