Both Very Low and Very High Heart Rates May Be Linked to Higher Stroke Risk, Study Says

Why It Matters

Resting heart rate, an inexpensive and routinely measured vital sign, may serve as an early indicator of stroke risk, prompting clinicians to refine risk‑stratification and preventive strategies.

Key Takeaways

• Resting heart rate 60‑69 bpm shows lowest stroke risk.
• Rates ≥90 bpm raise stroke risk 45% versus middle range.
• Rates <50 bpm increase stroke risk 25% after adjustments.
• Low rates tied to ischemic stroke; high rates to both types.
• Findings based on 460k UK Biobank participants over 14 years.

Pulse Analysis

The European Stroke Organisation Conference in Maastricht highlighted a UK Biobank analysis that examined resting heart rate and stroke incidence in nearly 460,000 adults aged 40‑69. Over an average follow‑up of 14 years, more than 12,000 strokes were recorded, revealing a U‑shaped curve: the lowest risk occurred at 60‑69 beats per minute, while rates below 50 or above 90 bpm were associated with markedly higher odds. After adjusting for hypertension, diabetes, cholesterol and atrial fibrillation, the extremes still showed 25 % and 45 % increased risk respectively, underscoring heart rate as an independent marker.

Clinicians may soon use resting heart rate as a quick triage tool alongside traditional risk scores. The study found low rates were primarily linked to ischemic strokes, suggesting insufficient cerebral perfusion, while high rates correlated with both ischemic and hemorrhagic events, possibly reflecting vascular wall stress. Because heart rate is readily captured by wearables and routine exams, it could flag patients who need tighter blood‑pressure or cholesterol control even when other metrics appear normal. However, the observational design precludes causal inference, and randomized trials are needed to test whether interventions that modify heart rate actually lower stroke incidence.

Public health messages have long praised a low resting heart rate as a fitness badge, yet this research cautions against a one‑size‑fits‑all interpretation. For sedentary individuals or older adults, a sub‑50 bpm reading may signal underlying autonomic dysfunction or medication effects, prompting further evaluation. Conversely, sustained tachycardia could be a red flag for hidden hypertension or metabolic stress. Integrating heart‑rate thresholds into stroke‑prevention guidelines could improve early detection, but policymakers must balance the risk of over‑screening with the benefits of a simple, low‑cost metric. Ongoing studies will clarify how best to translate these findings into practice.