Acute Effect of Alcohol Intake on Cardiovascular Autonomic Regulation During the First Hours of Sleep in a Large Real-World Sample of Finnish Employees: Observational Study

Pietilä, Helander, Korhonen, Myllymäki, Kujala, Lindholm · 2018 · JMIR Mental Health 5(1):e23

What this work gives Aellic

Dose-resolved resting heart rate response to alcohol: “HR was increased by 1.4 bpm with low, 4.0 bpm with moderate, and 8.7 bpm with high alcohol intake” (bands: ≤0.25 / >0.25–0.75 / >0.75 g/kg pure alcohol), n = 4,098 employees across 12,411 recording days, selected from an original sample of 111,025 measurement days from 42,086 employees. Preferred over WHOOP's linear extrapolation because it is dose-resolved rather than projected. Firstbeat is the data provider and the employer of two co-authors (Korhonen, Myllymäki); the company's own pages do not carry these bpm values at all.

Correction of 4 November 2026

Filed as an industry white paper until then — it is in fact a peer-reviewed observational study with a DOI, and has been re-graded accordingly. Corrected again on 2026-11-04: the sample was given as 111,025 measurement days, which is the original pool of 42,086 employees; the analysis itself used 12,411 recording days. The entry also named three Firstbeat employees among the authors; the paper's affiliations and conflict-of-interest statement name two.

The entry on the register was wrong. It was not replaced but kept, with what holds instead standing next to it.

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4 declared sites: constants and thresholds in the code that point at this entry.

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