---
title: "A 2026 StarCraft II tournament study found competitors' wrist tremor declined over the day and was unrelated to game outcome or APM"
type: "claim"
status: "seedling"
audit_status: "capture-verified"
date_created: "2026-07-09T00:00:00.000Z"
provenance: "Promotion from 10-inbox/raw/2026-07-09-hop-esports-telegraphists-cramp.md, 2026-07-09"
origin: "batch"
derived_from: ["10-inbox/raw/2026-07-09-hop-esports-telegraphists-cramp.md"]
source_url: "https://arxiv.org/abs/2607.06577"
source_title: "Esports and Physiological Tremor a StarCraft 2 Tournament Study"
source_author: "Białecki et al."
source_date: "2026-07"
source_quote: "a generalised psychophysiological adaptation to competitive esports rather than being a short-term performance predictor"
source_tier: 1
related_notes: ["claim-elite-sc2-players-worse-grip-strength-than-reference-group","claim-telegraphists-cramp-1890s-classified-as-occupational-neurosis","claim-inertia-1-pretrained-18-million-hours-accelerometer"]
tags: ["esports","physiology","occupational-health","tremor","hop"]
audits: ["2026-07-09 claude-opus-4-8"]
---


In "Esports and Physiological Tremor: a StarCraft 2 Tournament Study" (Białecki et al., arXiv:2607.06577, 2026), wrist-accelerometer recordings from 16 male StarCraft II players at a live tournament deviated sharply from population norms — elevated tremor power in the 2–4 Hz band, reduced power at higher frequencies, with effect sizes of d = 1.6–2.3 against reference data. The counterintuitive finding is directional: rather than worsening with accumulated fatigue across the tournament day, the measured tremor *declined*, and it tracked neither match outcome nor actions-per-minute (APM).

The authors frame physiological tremor as "a sensitive neuromuscular indicator that may be modulated by cognitive load and competitive stress," and read the day-long decline as "a generalised psychophysiological adaptation to competitive esports rather than being a short-term performance predictor." In other words, the signal is interpreted as a trait-like feature of how a competitor's neuromuscular system settles under sustained competition, not a real-time gauge of who is about to win.

The study is one output of a small Polish research program that treats esports competitors as a distinct physiological population (see [[claim-elite-sc2-players-worse-grip-strength-than-reference-group]]). Methodologically it belongs to the same wearable-accelerometer sensing family as broader motion-foundation-model work (see [[claim-inertia-1-pretrained-18-million-hours-accelerometer]]), though at far smaller scale. Its clinical framing of extreme-repetition hand use echoes a much older occupational-medicine precedent (see [[claim-telegraphists-cramp-1890s-classified-as-occupational-neurosis]]).

> [!note] Seek's commentary:
> The decline-not-worsening result is the real surprise, and the "adaptation" reading is not the only one available: with n=16 and an elimination-format tournament, players who tremor most may simply get knocked out early, so the day-level decline could be survivorship rather than within-person habituation. Worth someone testing against per-player longitudinal data before the "adaptation" gloss hardens. Tier-1 preprint, quoted from the abstract at capture time; not independently re-fetched, hence `capture-verified`. — Seek