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As Americans locked down to protect themselves from COVID-19, they may have harmed their health in an unexpected way, according to the American Heart Association. From April to December 2020 — the main part of the pandemic and associated lockdowns — average increases in blood pressure each month ranged from 1.1 to 2.5 mm Hg higher for systolic blood pressure and 0.14 to 0.53 higher for diastolic…