EXSC_Lecture3 - EXSC Lecture 3 April 2 Cardiovascular...

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EXSC Lecture 3 April 2 Cardiovascular Physiology 1.Heart Rate (HR) = Number of contractions/min 2. Stroke Volume (SV) = volume of blood ejected by each ventricle/contraction (reat) (s) 5L/min (about one circuit) - Average 70bpm stroke vol is 73 ml/beat Endurance Trained subject exactly the same cardiac output. Based on oxygen requirements. How they get it there would be different. Lower resting heart rate. If you bring it down to 50bpm = 100 ml/ beat (to get 5000 ml) If the blood comes out of the ventricle at a greater force, that person has bigger ventricles more muscle, etc. 3. Cardiac Output (Q) = vol of blood ejected by each ventricle/mi n Q (L/min)= HR(bpm)x SV(ml/b) Cardiac Output is better, changes in resting heart rate, one could get information about output, it doesn’t change, don’t need extra equipment ** Above values would occur during rest ** Maximal Exercise Q = HR x SV Sedentary ~ 17 L/min = 200bpm (max predicted HR) x 87 ml/min) Blood makes circuit every 20 sec - Well trained endurance athlete its very very different they can achieve Q at close to 40 Liters/min, same Max HR (200) so in order to acheiev 37 (?) liters, it would have to be 150 bpm Lungs are NOT a limiting factor in anything assuming there are no diseases or air pollution, etc. But when you look at the cardiovascular system its so different. It IS a limiting factor in exercise. No doubt it plays a major role in terms of the ability to do exercise Graph: Work vs. HR, linear,positive - for the same amount of work, a trained idiv would have a lower HR - middle = sedentary Graph: Work vs. Stroke Volume Positive Curve: sedentary middle Trained Endurance athlete would be above the curve Graph: Work vs. Q Sed middle, linear pos Endurance Rest and submax exercise, cardiac output are the same based on oxygen needs, but an untrained person will stop their exercise. The difference is the athlete would be able to continue. Use of HR to determine exer. Int. Predicted max HR = 220 - age + or - 10 (which is about the SD) 190 - 210 HR used quite a bit by people, most used thing, universally Is it dangerous? 60% - 80% 70% Duration, frequency, intensity which has the most impact on improving cardiovascular ___? Intensity. That’s the most important one.
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Work out 70% is value to get a good intensity, approx 140 bpm 70% max, 20 yrs 200x 0.7 = 140 bpm The SIMPLE equation for training HR. Takes into account age and intensity level: Two male subjects both 20 yrs of age, one has a resting hr of 50 bpm the other has one of 80 bpm They should exercise at 140bpm are they doing equitable amounts of work? It would appear that something is at odds because one’s HR is going up 190 beats, another is going up 60 beats. Subject one There is an equation that tries to take into account training: Karvonen equation (Swedish physiologist): THR = (max HR - RHR) x intensity (I.e. 70%) + RHR Training HR = (max HR always 200 -age , - resting HR) i.e. (200 -50) x 0.7 + 50 1 = 155 2 = 164 When you use the simple equation for intensity, it over estimates what the true intensity Second Exam: X bar = 31 (of 40) 78% A = greater than or = 36 B = 32 - 35 C = 25 - 31 D = 25 - 31 D = 21 - 24 No curve, straight grade TUESDAY, APRIL 7 Cardiovascular
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