Lecture 13 notes: APK3110c - Applied Exercise Physiology
Lecture 13 notes: APK3110c - Applied Exercise Physiology APK3110c
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This 5 page Class Notes was uploaded by Courtney Adams on Tuesday October 27, 2015. The Class Notes belongs to APK3110c at Florida State University taught by Dr. Robert Moffatt in Fall 2015. Since its upload, it has received 47 views.
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Date Created: 10/27/15
Exercise Physiology AP KBl 10 13 101515 Pulmonary Ventilation 0 Ve Vi 39 VezRRxTV 0 We lmin RR of breaths you take per min TV the amount of air you take in a breath 4 similar to Q HR R EV just like blood flow o Minute Ventilation at rest you will see values at 710 Lmin Plotting Ve to V02 39 If the increases of We are not proportionate to the increases ofVOZ at least when we get to about 6039 l 70 of maximum then it must not he the amount of air you take in that drives regulates limits the amount of oxygen consumed o if they did they would he proportionate The fact of the matter is it is NOT proportionate so therefore minute ventilation does NOT limit your ability to consume oxygen 0 Comparing minute ventilation in an untrained person with a trained person 0 Untrained 100110 Lmin o Trained 160180 Lmin Shows a relatively dramatic V79 7 1 RES quot3quot improvement 39 ma 39 Due primarily to the fact that the respiratory V 0 1 muscles improve What limits your aloility to consume oxygen NOT ventilation 39 If you were to plot the volume of C02 produced and We you would see the relationship is a little different 0 LlNEAR response I Suggests that the more oxygen you consume the more C02 you will produce and the more you need to ventilate to get rid of it 39 The amount of C02 produces drives ventilation o The C02 produced is what causes you to breath more frequently V001 Exercise Physiology APKBI 1013 101515 Energy Costs ofVe Any muscle from the body requires oxygen to function 39 At rest you are probably required 1a2 of your oxygen needs of ventilation 0 At rest respiratory muscles have to work contract overcome the restrictive fOrCES of the thorax 9 all require energy and oxygen to transpire that energy 0 The oxygen cost of breathing 39 The 02 of Vie against Ve le At rest 23 of your oxygen is going to be ventilated 39 Suggests that the harder you work the more work you perform the more intense the work the more you ventilate the greater the oxygen required to support those respiratory muscles involved taking in more air 39 Trained individuals commonly have lower submaximal x ventilation I Max max 39 Ex lfyou are in a lab and train on a bike work at a certain 295139 force 9 observe that you are ventilating 50 of V02 max at SOLmin 39 Then you are brought back into the lab after several months of training some workload same conditions not ventilating SOLmin anymore now ventilating 65 illmin 1K 39 So if We look at this in context to the energy cost of breathing o So if you follow this over to 50 of V02 E requiring you 6 of oxygen to support ventilation 0 But not as a trained person you are ventilating less and only require 3 39 The less ventilator requirement for oxygen due to training the more can be made available to the working muscles If at Exercise Physiology APK311013 101515 Respiratory Control I Everything is monitored in some fashion and is feed back to the brain which then make the decisions about what processes need to he enabled 0 Hypothalamus where a lot of this control is exerted 0 We can regulate cardiovascular respiratory center o Where the process goes on and decisions are made to stimulate the body s response 0 Input from o Lungs 0 Heart I N 7 All feed in to the cardiovascular 0 Blood Vessels respiratory center in the O Bram hypothalamus o MusclesJoint stretch 0 Temperature The way you signal these centers Neural stimuli takes place in the higher brain systems 0 More importantly mental conditions neural stimuli stretch to the lungs limb movement 0 Ex ifwe are going to run we start thinking about and anticipating the activity 39 Humeral stimuli stimuli that changes the physical or chemical properties of the blood 0 Changes in pH Change of the chemical property of blood Change in concentrations Change in 02002 content Change oftemperature Change of pressure Change in H ion content All change how the cardiorespiratory center responds I Most are indirect sensed through senses throughout the hody quot Ex Sense BP haroreceptors sense the amount of DZCOZ that flows around sense the amount of H ions accumulated g sends more feedback to the brain 39 Increase pressure Increase stimulated Increase sensory feedback in the hypothalamus 39 Temperature works both indirectly and directly 0 Directly receptors that monitor temperature throughout the loody o Indirectly feeds back to the hypothalamus OOOOOD Exercise Physiology APK311013 101515 I Blood hathes hypothalamus and the blood that passes through the hypothalamus can sense the temperature of the blood LUNGS Increase TV RR and Vlz 39 Increases all three through the sematic motor neurons that innervate the lungs 39 Release Ach 39 Ach will dictate which needs to he more active Hypothalamus Heart 1 Increase BPMi and 5V 39 Both dictated by increasing norepinephrine O Sympathetic effect accelerates the heart beat and increases the strength of contraction Increase in epinephrine quot increase in Hemoglobin 4 Strengthens contraction Blood Vessels I constriction and dilation 39 just not the amount of blood that you push out of the heart it is also how you selectively increase the flow of blood to areas on importance and minimize areas that are less important 39 Motor nerves that innervate the smooth muscles of the blood vessel and also belong to the autonomic nervous system Sympathetic vasoconstriction go to almost all the body s arterioles and veins and stimulates 9 either causing venoconstriction or vasoconstriction 0 Through norepinephrine and epinephrine adrenal medulla Sympathetic 39vasod ilatation only innervate the arterioles of skeletal and cardiac muscles 0 When Ash is released causes vasodilation I Muscle of the skeletal system in the heart that you would need to dilate Exercise Physiology j APK311013 T1102 Muscle Contractmn 101515 gt T02 blood Blood ggw A i ACH J Brood How Kidneys Liver GM Tract ACH Nonworking muscle A NE Err NE EP Hypothalamus 39 EPI l e Adrenal Medu a Cardio Respiratory Center