Long-term Accuracy and Stability of Blood Pressure Measurements From a Smartwatch: Prospective Validation Study

Inclusion Criteria: * Healthy volunteer Exclusion Criteria: * post-traumatic conditions of the upper limbs * tattoos, birthmarks, injuries or diseases of the skin on the wrists of hands * cardiac arrhythmias * circulatory or peripheral varcular disease * aortic valve disease * myocardiopathy * other cardiovascular diseases * pregnancy * kidney disease * diabetes * neurotic disorder * haemostatic disorders * use of blood-thinning drugs