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Blood Flow During Exercise ✓ When exercise begins, blood is sent to the working muscles ✓ Less blood is therefore available to digest food in the gut, which can cause cramps ✓ The flow of blood from other areas into the muscle is known as blood shunting. ✓ This is why an exercise session should not start until 2/3 hours after the last meal Redistribution of blood during exercise Blood Shunting is where the blood is redistributed when we start to exercise ● As we exercise, the destination of blood flow changes dramatically. ● Blood flow can be diverted away from non-essential tissues and organs and directed to working muscles ● During exercise muscles gain 80-90% of total blood flow ● Destination Rest Maximal exercise Muscle 20% 80% Brain 15% 11% Heart 5% 4% Skin 10% 3% Liver & Intestines 30% 1% Kidneys 20% 1% ● Explain Vasodilation… ● Explain Vasoconstriction… ● Therefore less blood is available to digest the food, so we must leave 2 hours after a large meal. ● It could cause cramps if you do exercise after a meal.