KINE 1020 Lecture Notes - Lecture 41: Blood Doping, Pericardium, Vo2 Max
5 Sep 2016
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Heart rate: vagal (parasympathetic at rest) withdrawal ~100-110bpm (quick: when you suddenly do something like stand up, sympathetic activation hr max (slower) Age predicted heart rate max = 200 age accurate within 10-15bpm: used to predict exercise intensity, easier than measuring o2 uptake (vo2) Stroke volume: increases with exercise: greater contractibility (frank-starling mechanism) Overfill ventricles to pump out a higher sv even more with exercise: reduced peripheral resistance (vasodilation) Arteries are small at rest and then open up during exercise: elite athletes have higher sv due to larger hearts, and more muscular ventricle walls. Options to increase vo2: deliver the same and extract a greater proportion, deliver more and extract the same proportion, deliver more and extract a greater proportion. Delivery is a function of [hb] and blood delivery. During exercise hb does not increase because it takes a long time to create new proteins [hb] may decrease because more water is released into your blood.
