The Garmin derived respiration rate is garbage, except for maybe at rest… I know from manually tracking mine on the bike that my zone 2 is 12-14 BPM, tempo is 15-18, threshold is 20-24, and VO2Max probably 27-30. Garmin measures are well above these. On a recent zone 2 ride Garmin had my avg BPM at 27! Reality was closer to 14
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