The paper: RR interval signal quality of a heart rate monitor and an ECG Holter at rest and during exercise which was published in the European Journal of Applied Physiology in July 2019 https://pubmed.ncbi.nlm.nih.gov/31004219 By Rahel Gilgen-Ammann, Theresa Schweizer & Thomas Wyss from the Swiss Federal Institute of Sports in Magglingen: and discussed by Peter …