Key points from article :
Researchers looked at the effects of half an hour of walking on the blood pressure.
Compared to participants who were sitting down for 8 hours a day.
Systolic blood pressure (the upper figure) dropped by an average 3.4mmHg.
Women got extra benefit from frequent 3-minute walk breaks throughout the day.
Did not directly compare the effects of exercise with blood pressure drugs.
People should not stop blood pressure medications without talking to a doctor.
Experiments bu University of Western Australia included 67 adults aged 55 to 80.
The study was published in journal Hypertension.
