Orthopedics · Medical Literature
Acute effects of dynamic stretching combined with different blood flow restriction pressures on explosive performance in healthy young men.
Abstract
This study aimed to investigate the acute effects of dynamic stretching (DS) combined with different blood flow restriction (BFR) pressures on explosive performance in healthy young males, and to examine whether these effects differed across estimated arterial occlusion pressure (AOP) levels and performance tasks. In a randomized crossover design, 20 participants completed four warm-up protocols: DS alone, and DS combined with BFR at 30%, 50%, or 70% of estimated AOP applied to the proximal thighs. Explosive performance was assessed before and after each warm-up protocol using countermovement jump (CMJ), standing long jump (SLJ), 10-m sprint (10mSS), and 505 change-of-direction (505COD) tests. CMJ showed a significant time × condition interaction. All DS+BFR protocols produced greater CMJ change scores than DS alone (all p < 0.01), with mean changes of 5.80 ± 1.99 cm, 5.95 ± 2.33 cm, and 5.15 ± 1.90 cm for the 30%, 50%, and 70% estimated AOP conditions, respectively, compared with 3.50 ± 2.21 cm in the DS condition. No significant differences were observed among the three BFR pressures. In contrast, SLJ, 10-m sprint, and 505COD showed no significant time × condition interactions, indicating that adding BFR did not provide statistically greater acute benefits than the DS condition for these tasks. Adding BFR to dynamic stretching produced an additional acute benefit for CMJ, but this effect was not pressure-dependent across the estimated AOP levels tested. The additional benefit of BFR was not observed for SLJ, 10-m sprint, or 505COD, suggesting that the acute effects of DS+BFR may be task-specific.
Clinical relevance
In healthy young males, does adding blood flow restriction (BFR) at varying estimated arterial occlusion pressure (AOP) levels (30%, 50%, or 70%) to a dynamic stretching warm-up protocol produce greater acute improvements in explosive performance compared with dynamic stretching alone? __SNAPSHOT__ {"studyDesign":"Randomized crossover trial (within-subject, repeated-measures design)","setting":"Not reported (country and institution type not specified in abstract)","sampleSize":"n = 20 healthy young males","population":"Healthy young males; additional inclusion/exclusion criteria (e.g., training status, age range, body composition) not reported in abstract","intervention":"Dynamic stretching (DS) combined with BFR cuffs applied to the proximal thighs at 30%, 50%, or 70% of estimated arterial occlusion pressure (AOP) — three separate experimental conditions","comparator":"Dynamic stretching (DS) alone (active comparator warm-up without BFR)","primaryOutcome":"Explosive performance assessed via countermovement jump (CMJ), standing long jump (SLJ), 10-m sprint (10mSS), and 505 change-of-direction (505COD) test; the abstract reports a significant time × condition interaction for CMJ as the focal finding; primary vs. secondary endpoint hierarchy not explicitly stated","followUp":"Acute (pre- to post-single warm-up protocol within a single session); intersession washout period not reported in abstract","fundingSource":"Not reported"}
Key findings
CMJ demonstrated a statistically significant time × condition interaction. All three DS+BFR protocols produced greater CMJ change scores than DS alone (all p < 0.01). Mean CMJ change scores were: DS+BFR 30% AOP: 5.80 ± 1.99 cm; DS+BFR 50% AOP: 5.95 ± 2.33 cm; DS+BFR 70% AOP: 5.15 ± 1.90 cm; DS alone: 3.50 ± 2.21 cm. Absolute incremental benefit of DS+BFR over DS alone ranged from approximately 1.65 cm (70% AOP condition) to 2.45 cm (50% AOP condition) (calculated). No statistically significant differences were observed among the three BFR pressure levels for CMJ, suggesting a threshold rather than dose-response relationship for vertical jump performance. Results for SLJ, 10mSS, and 505COD were not fully reported in the available abstract; confidence intervals, effect sizes (e.g., Cohen's d, partial η²), and NNT/NNH are not reported and cannot be calculated from the provided data. Whether adverse events or discomfort associated with cuff application were monitored is not reported.
Practice implications
This study establishes that the addition of BFR at any tested pressure level (30%–70% AOP) to a dynamic stretching warm-up acutely augments countermovement jump height beyond dynamic stretching alone in healthy young men, with the effect appearing pressure-independent across the tested range. The absolute CMJ increments (~1.6–2.5 cm above DS-alone gains) may be athletically meaningful in competitive contexts where marginal gains in jump performance are consequential; however, the minimal clinically/practically important difference for CMJ in this population was not discussed. The study does NOT establish whether these effects extend to women, older individuals, clinical populations, or trained athletes, as only healthy young males were studied. The complete findings for SLJ, 10mSS, and 505COD were unavailable in the abstract, limiting interpretation of whether BFR augments a broader spectrum of explosive tasks. Mechanism (e.g., post-activation performance enhancement, reactive hyperemia, or neural potentiation) is not resolved. IMPORTANT LIMITATION: Only the abstract was available for this summary; full methodology, statistical reporting, adverse event data, and complete outcome results could not be reviewed, which substantially constrains the strength of this clinical interpretation. __LIMITATIONS__ Very small sample (n = 20), limiting statistical power to detect differences among BFR pressure conditions and increasing risk of Type II error for non-significant comparisons.,All-male, presumably young and healthy cohort — findings are not generalizable to females, older adults, individuals with cardiovascular or musculoskeletal comorbidities, or clinical rehabilitation populations.,Crossover design is vulnerable to order effects and carryover effects; adequacy of washout period between sessions is not reported in the abstract.,Complete results for three of four performance outcomes (SLJ, 10mSS, 505COD) were not available in the abstract, precluding a full assessment of the breadth of BFR's acute ergogenic effect.,AOP was 'estimated' rather than measured with Doppler ultrasound, introducing potential measurement error in cuff pressure assignment across participants.,No blinding of participants or assessors is possible given the nature of the intervention; expectation and placebo effects cannot be excluded.,Absence of reported confidence intervals, effect sizes, and NNT/NNH limits assessment of precision and practical significance of findings.,Funding source not disclosed, precluding assessment of potential conflicts of interest.,Acute single-session design precludes any inference about whether these warm-up effects are maintained, cumulative, or relevant to long-term training adaptation.,Summary based on abstract only; full methodology, randomization procedures, allocation concealment, and adverse event monitoring were not accessible. __BOTTOM_LINE_CATEGORY__ promising_but_preliminary __BOTTOM_LINE__ Adding BFR cuffs (30%–70% estimated AOP) to a dynamic stretching warm-up acutely enhances countermovement jump height more than dynamic stretching alone in healthy young men, with no significant difference among the three BFR pressures tested — suggesting that even low occlusion pressures may suffice. These findings are preliminary due to a small sample, male-only cohort, acute single-session design, and abstract-only availability; clinicians and strength and conditioning practitioners should await replication in diverse populations before broadly adopting BFR-augmented warm-ups as standard practice.