APK 3110C Lecture Notes - Lecture 4: Body Composition, Electrocardiography, Vagus Nerve
5 Mar 2018
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Q= cardiac output (co) = hr x sv (a-v)= difference. Frank starling mechanism (law): greater venous return yields greater stretch of the ventricle, optimizing alignment of actin- myosin cross bridges and therefore contractility. Functional sympatholysis: shunting of blood away from areas that do not need it as readily (during stressful times) Vo2 max: max oxygen consumed, transported, and utilized, at the highest workload. Measure of max capability of oxidative energy system to produce atp during exercise, aerobic power, gold standard for measuring cardiorespiratory endurance and fitness. Accounts for 25-50% of variance in vo2 max values. Individual genetic makeup predetermines a range of vo2 max values. Males have 15-20% greater vo2 max than females. Determining vo2 max: plateau in vo2 with an increased intensity. Hr +/- 10 bpm of estimated max (220-age) If this criteria is not reached, maximal exercise is termed vo2 peak. Rer= co2 produced at lungs / o2 consumed at lungs.
