The collected data was analyzed to assess the cold related changes in blood pressure (brachial and central aortic) and heart rate. ECG morphology and vector cardiographic parameters were computed from derived 12-lead ECG recordings at the Institute of Clinical Medicine at University of Oulu. Arrhythmias were detected automatically and confirmed with visual inspection by trained health care professional. To assess the regulation of circulation, continuous blood pressure signal and simultaneously recorded three lead ECG are applied to compute baroreflex sensitivity and heart rate variability at the Verve research center. In the data analyses responses to cold exposure will be evaluated and compared between hypertensive and normotensive subjects. In addition to the above mentioned topics combined risk factors for adverse changes in cardiovascular function during cold exposure will be evaluated, such as high arterial stiffness, altered ECG, and low heart rate variability. Based on this, a profile of a high risk patient will be defined and shared with physicians treating hypertensive patients to reduce adverse cold-related cardiac events.