https://www.selleckchem.com/pr....oducts/hexamethonium
ar Vantage V, Garmin Fenix 5, and Fitbit Versa, in that order. The Apple Watch Series 4 and Polar Vantage V are suitable for valid HR measurements at the intensities tested, but HR data provided by the Garmin Fenix 5 and Fitbit Versa should be interpreted with caution due to higher error rates at certain intensities. None of the 4 wrist-worn wearables should be employed to monitor EE at the intensities and durations tested. ©Peter Düking, Laura Giessing, Marie Ottilie Frenkel, Karsten Koehler, Hans-Christer Holmberg, Billy