Key result
Low-load resistance training with high blood flow restriction pressures (≥50% AOP) precipitated repetition failure in ~14.5 fewer repetitions (95% CI -19.53 to -9.38) compared with low-load training.
Why the study?
Low-load resistance training with blood flow restriction may accelerate repetition failure and offer greater time efficiency, but evidence comparing its effects on repetition failure versus low-load resistance training alone required exploration.
Does low-load resistance training with blood flow restriction reduce repetitions to failure compared to low-load resistance training alone in healthy subjects?
Meta-Analysis (n=218)
Does low-load resistance training with blood flow restriction reduce repetitions to failure compared to low-load resistance training alone in healthy subjects?
High-pressure blood flow restriction during low-load resistance training significantly accelerates repetition failure, potentially improving time efficiency for muscle hypertrophy and strength training.
Answers are grounded in this paper and cite their sources.
High BFR pressures hasten failure in low-load RT; extends pressure-specific guidance for training protocols.
Cerqueira, MS, Lira, M, Mendonça Barboza, JA, Burr, JF, Wanderley e Lima, TB, Maciel, DG, and De Brito Vieira, WH. Repetition failure occurs earlier during low-load resistance exercise with high but not low blood flow restriction pressures: a systematic review and meta-analysis. J Strength Cond Res XX(X): 000-000, 2021-High-load and low-load resistance training (LL-RT) performed to failure are considered effective for improving muscle mass and strength. Alternatively, LL-RT with blood flow restriction (LL-BFR) may accelerate repetition failure and has been suggested to be more time efficient than LL-RT. This study explores the evidence for the effects of LL-BFR vs. LL-RT on repetition failure. A systematic literature search was conducted in the PubMed, CINAHL, Web of Science, CENTRAL, Scopus, SPORTDiscus, and PEDro databases. Meta-analyses of mean differences and 95% confidence intervals (CIs) were performed using a random-effects model. Subgroup analyses were conducted for both the high and low blood flow restriction pressures. The search identified n = 10 articles that met the inclusion criteria. The meta-analysis comprised a total of 218 healthy subjects. Low-load resistance training with blood flow restriction with high pressures (≥50% arterial occlusion pressure [AOP]) precipitate repetition failure in ∼14.5 fewer repetitions (95% CI -19.53 to -9.38) compared with LL-RT, whereas the use of low pressures (<50% AOP) stimulated repetition failure with ∼1.4 fewer repetitions (95% CI -3.11 to 0.37); however, this difference was not statistically significant. Repetition failure has been demonstrated to be an important normalizing variable when comparing the hypertrophic and strength effects resulting from resistance training and occurs earlier during low-load resistance exercise with high but not low blood flow restriction pressures.
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Cerqueira et al. (2021) conducted a meta-analysis in healthy subjects (n=218). Low-load resistance training with blood flow restriction (LL-BFR) vs. Low-load resistance training (LL-RT) was evaluated on repetition failure (MD -14.5, 95% CI -19.53 to -9.38). Low-load resistance training with high blood flow restriction pressures (≥50% AOP) precipitated repetition failure in ~14.5 fewer repetitions (95% CI -19.53 to -9.38) compared with low-load training.
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