Kinesiology 2230A/B Lecture Notes - Lecture 21: Myocardial Infarction, Blood Pressure, Stroke Volume
14 Mar 2018
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It"s not as easy to get blood back to the heart so that means that sv is going to decrease as well, so we need to increase our hr to maintain cardiac output. If you take your hr after being asleep laying down, that"s going to be your lowest heart rate because of the horizontal sv boost. Esv (remains in ventricle after contraction) is changed by position. Esv when go from lying down to standing up deacreases (-> increase stroke volume: more blood out of heart) Edv when lying down is much greater than that increase in edv when you stand up. Greater increase in filling: easier to get blood back to the heart. The frank starling mechanisms states that the energy of contraction is proportional to the initial length of the cardiac muscle fiber. An increased contraction accompanying increase edv or ventricular stretch. Trained athletes increase edv decrease esv and sv decreases.
