Modeling the association between HR variability and illness in elite swimmers
Hellard, Guimaraes, Avalos, Houel, Hausswirth, Toussaint · 2011 · Medicine & Science in Sports & Exercise 43(6):1063–1070
Observational study · Rang 5 von 9
What this work gives Aellic
DOES NOT SUPPORT THE RULE ATTRIBUTED TO IT. The paper measures SD1, SD2, HF and LF — RMSSD does not appear at all — samples weekly over two years in n = 18, and finds the OPPOSITE direction: a RISE in the parasympathetic indices (HF, SD1) measured supine one week earlier went together with a HIGHER risk of illness. A threshold of “≥20 % drop over 3–5 days” appears nowhere in it; a 3–5 day window is not even part of the study design. Until 2026-07-25 this source carried Aellic's deviation rule — that rule is a practitioner heuristic without a clean primary source and now stands as an openly unsourced design decision.
Where this sits in the engine
This work is on the register, but nothing computes with it today — mostly because the feature it belongs to has not been built yet. It is listed so the numbers on the overview do not claim more than they carry.
Register entry hellard2011 · Observational study