The standard deviation of the interval between QRS complexes recorded over 24 h (SDNN24) is an important metric of cardiovascular health. Wrist-worn fitness wearable devices record heart beats 24/7 having a complete overview of users’ heart status. Due to motion artefacts affecting QRS complexes recording. and the different nature of the heart rate sensor used on wearable devices comp... https://unitedssports.shop/product-category/hockey-protective-pants-youth/