After 8 weeks , systolic blood pressure and diastolic blood pressure ( 13117 mm Hg [ P < 0.05 ] and 759 mm Hg [ P < 0.01 ] , respectively ) and brachial-ankle pulse wave velocity ( 1,401122 cm/second ; P < 0.01 ) were significantly lower than baseline levels ( 13814 mm Hg , 807 mm Hg , and 1,498179 cm/second , respectively ) , with significant ( P < 0.05 ) grouptime interactions in the blueberry powder group , whereas there were no changes in the group receiving the control powder .