After @ weeks , systolic blood pressure and diastolic blood pressure ( @ mm Hg -LSB- P < @ -RSB- and @ mm Hg -LSB- P < @ -RSB- , respectively ) and brachial-ankle pulse wave velocity ( @,@ cm/second ; P < @ ) were significantly lower than baseline levels ( @ mm Hg , @ mm Hg , and @,@ cm/second , respectively ) , with significant ( P < @ ) grouptime interactions in the blueberry powder group , whereas there were no changes in the group receiving the control powder .