Cuffed squats primed power — and felt much harder

Post-activation potentiation enhancement is the idea that a demanding conditioning exercise can temporarily prime the nervous system so that a subsequent explosive effort, such as a jump or sprint, is better than it would otherwise be. Blood flow restriction training, which uses cuffs to partially occlude limb blood flow, has been proposed as a way to trigger this priming effect without the heavy loading normally required. That would be attractive both for athletes managing joint stress and for rehabilitation settings. But the protocols vary widely in pressure, intensity, exercise choice and rest, and no synthesis had established which combinations actually work or what they cost in perceived effort.

The authors systematically searched PubMed, Web of Science, Scopus and EBSCO from database inception to 1 December 2025 for randomised controlled trials examining the acute effects of lower-limb blood flow restriction on post-activation potentiation enhancement and rating of perceived exertion. Risk of bias was assessed with the Cochrane Collaboration's tool, and analysis was performed in Review Manager 5.4 and Stata 17.0 with heterogeneity testing, subgroup analysis, sensitivity analysis and publication bias assessment. Fifteen eligible trials were included, covering 244 participants aged between 17 and 35 years. Subgroups examined exercise type, rest interval length, occlusion pressure as a percentage of arterial occlusion pressure, and exercise intensity relative to one-rep max.

Overall, blood flow restriction significantly enhanced explosive performance with a standardised mean difference of 0.55, though heterogeneity was high at I² = 78%. Subgroup effects were considerably larger for multi-joint movements such as squats, at SMD 1.20, for rest intervals longer than 4 minutes at SMD 0.98, and for occlusion pressure of 40-60% of arterial occlusion pressure at SMD 0.83. The countermovement jump was the most sensitive outcome measure at SMD 0.83. On the cost side, perceived exertion rose significantly with an SMD of 0.82 and moderate heterogeneity at I² = 60%, with the sharpest increases under compound exercises at SMD 1.54, low intensity below 40% of one-rep max at SMD 0.86, and occlusion pressure above 60% of arterial occlusion pressure at SMD 1.37. Sensitivity analysis suggested the results were stable and Egger's test found no significant publication bias.

This consolidates a scattered acute-response literature into a clearer picture and, usefully, separates the conditions that produce the priming benefit from those that mainly produce discomfort. The dose-response pattern is notable: moderate cuff pressures with generous rest appear to carry the effect, while higher pressures and shorter rests amplify subjective fatigue. However, the high heterogeneity for the primary outcome and the reliance of several subgroups on only one or two studies mean the specific parameter recommendations are provisional. Whether these acute performance bumps translate into meaningful competition outcomes or longer-term adaptation is not addressed here.

This is a reason to think that occlusion cuffs used before explosive work are not simply a gimmick, but that the details of how they are used decide whether there is any benefit. The pattern in the data points towards compound lower-body lifts, moderate pressure and a genuinely long rest before the explosive effort. It is also honest about the trade-off: the same protocols reliably feel harder, and the highest pressures generated the greatest sense of fatigue without being the best for performance. The evidence base is young adults aged 17 to 35, so older or untrained people are not represented.