Among 15 chronic stroke patients (mean age 69.3 years), three hours of uninterrupted sitting elevated central systolic blood pressure (cSBP) by 9.6 mmHg, whereas performing 10 bilateral heel-raises every 10 minutes reduced that rise to 5.6 mmHg — a 42% attenuation — with a moderate-to-large effect size (partial η² = 0.28). The non-ambulatory interruptions also reduced estimated cardiac workload, suggesting meaningful hemodynamic benefit from a minimal-effort intervention.
This randomized crossover trial addresses a genuinely underexplored gap: whether sedentary-break strategies proven in healthy adults translate to high-risk, mobility-limited populations. Stroke survivors face compounded cardiovascular risk — both from the original cerebrovascular event and from the post-stroke sedentary lifestyle that rehabilitation constraints often impose. Central blood pressure, rather than peripheral, is the mechanistically stronger predictor of target-organ damage, making the cSBP outcome particularly relevant.
That said, critical limitations temper enthusiasm. With only 15 participants, statistical power is marginal and generalizability is narrow. The 4 mmHg absolute difference between conditions, while directionally meaningful, may not reach clinical significance individually. The authors themselves acknowledge the interruptions may need higher intensity or frequency to fully protect vascular function. As a preprint not yet peer-reviewed, the findings require independent replication before informing clinical guidelines. Still, the intervention's simplicity — no standing required — makes this a pragmatic and promising secondary-prevention signal worth watching.
