Continuous blood pressure monitoring in daily life could contribute to early detection of strokes and heart attacks, as well as healthcare promotion. Understanding of what patients were doing when their blood pressure changes occurred would be much more helpful to check the causes of blood pressure changes. However, at present, patients should record their activities by filling the clinical activity record card. The activity record card is so inconvenient that handwriting all the activities becomes a burden and causes inaccuracy. Moreover, it is not able to record posture changes that are a major factor related to short-term blood pressure changes. From these reasons, automatic activities recognition method is strongly required.

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