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From Fellrnr.com, Running tips
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* The human body does not have enough blood to fully supply all capillaries in the body, and so it will redistribute the blood flow to the most needed areas. Endurance training improves this redistribution, including redistribution within the muscles themselves, providing more blood to the slow twitch fibers and less to the fast twitch fibers.
* Blood pressure at a given exercise intensity is reduced, but at maximum intensity systolic pressure is increased and diastolic is reduced. (Systolic is the higher pressure when the heart beats and diastolic is the lower pressure when the heart is refilling.)
* Endurance training generally lowers resting blood pressure . Systolic is reduced by ~4 mm Hg and diastolic by 3 mm Hg in sedentary individuals people with either high blood pressure, but not in those with or normal blood pressure<ref name="Whelton-2002">{{Cite journal | last1 = Whelton | first1 = SP. | last2 = Chin | first2 = A. | last3 = Xin | first3 = X. | last4 = He | first4 = J. However, some people do suffer from low | title = Effect of aerobic exercise on blood pressure: a meta-analysis of randomized, controlled trials. | journal = Ann Intern Med | volume = 136 | issue = 7 | pages = 493-503 | month = Apr | year = 2002 | doi = | PMID = 11926784 }}</ref>.
* Blood volume increases with endurance training, and higher intensity produces a greater change.
** Blood plasma increases rapidly, with initial changes seen within an hour of the end of the first bout of training.
