Recent studies found that meditation and yoga reduce diastolic blood pressure (the lower range) by 3-8 millimetres of mercury (mmHg), compared with people who engaged in another activity, such as aerobic exercise or relaxation.
Both focused attention and automatic self-transcending meditation styles, as well as yoga, reduced systolic blood pressure (the upper range) by 4-5mmHg, compared with people who were not practicing any kind of meditation or yoga. This is important because reductions in systolic and diastolic blood pressure of as little as two mmHg can reduce the incidence of heart disease and stroke.
Open monitoring and focused attention meditation and yoga reduced heart rate by three to four beats per minute. This is similar to the effects of aerobic exercise, which reduced heart rate by five beats per minute in one study.
(source: https://theconversation.com/its-not-all-in-your-mind-how-meditation-affects-the-brain-to-help-you-stress-less-97777 )