Lecture 3: APK3110- Applied Exercise Physiology
Lecture 3: APK3110- Applied Exercise Physiology APK3110c
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This 5 page Class Notes was uploaded by Courtney Adams on Wednesday September 16, 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 225 views.
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Date Created: 09/16/15
Lecture 3 Notes Exercise Physiology 9415 RQ Volume of 02 produced Volume of 02 consumed RQPROTElN e 085 RQCHO 100 no FAT 070 39 We don t worry about protein as much because it is not a primary fuel As we get closer and closer to the maximal oxygen consumption the higher the RQ becomes 39 Rest using a mixture of fuels 9 ex measuring the RQ at rest and coming up with 082 you can actually determined the percentage of C atoms producing energy from carbohydrates vs fats 0 Can actually calculate the energy you are V02 deriving from each source by knowing what the RQ is at any point Eventually you will get to the point where you are using carbs and only carbs 9 bc it doesn t require as much oxygen to degrade carbs 0 When you are working at intense levels with N0 oxygen 9 you need a fuel that isn t dependent on oxygen the most ef cient fuel The body makes these adjustments for you 0 Body uses fats at lower intensities of effort The higher the intensity the body knows that it will have a harder time picking up oxygen from the mitochondria so we switch to a more efficient fuel under those circumstances9 carbohydrates more carbs and less fats o The more intense the effort in glycolysis the body always produces some lactic acid But it gets to a point where the body produces more lactate than the body can handle I The more intensity9 produces more lactate9 more lactate in the blood9 inhibits the mobilization of FA in the body You use some protein even when you are at rest Maybe 5 of your energy is coming from protein just sitting there 0 The amount of protein is new 7 ll 77 ibleat rest o However when you exercise the alanine and glutamine AA levels rise in the blood I GlucoseAlanine cycle Alanine 9 pyruvate 9 LIVER 9 used to make new glucose gluconeogenesis 9 can be taken up by the various skeletal muscle tissue and used in the body I The more intense the exercise the greater the levels of alanine is released from the muscle Lecture 3 Notes Exercise Physiology 9415 I Protein extremely very important fuel under conditions of desperation when glycogen levels are depleted STARVA39l l DN o Glucose is the brains primary fuel source so we always need glucose in the blood so that we can survive Q So you take these AA that start as protein precursors in the liver to make new glucose 4 so you will use protein more predominantly for that reason I lsoleucine another AA can enter the Krebs cycle directly and produces energy under severe exercise conditions concentration is better in people that are untrained As a result of chronic training and when you become more conditioned you see the body start to depend more on proteins or AA 39 ATP is our energy currency 0 You take the chemical energy stored as ATP and you can turn it into work 0 Three sources that produce energy so it can be broken down into work 1 CP 2i Anaerobic Glycolysis 3 Aerobic Metabolism K ATP ADP Pi ENERGY gtWORK 39 Anaerobic Aerobic Glycolysis Metabolism CHO CHO Fat Protein CP Compare the rate of ATP produced in a given amount of time and max capacity of energy produced independently time NOT being a factor 1i ATP PC fastest allows it to occur almost instantaneously 3 moles 2 Lactic Acid System Anaerobic Glycolysis 16 moles 39 Maximum capacity of ATP produced 1L Aerobic Metabolism 100 moles of ATP capacityswise Anaerobic Glycolysis 12 moles 3 ATPPC system 07 moles 0 Comparing different levels of exercise work compare working at a maximal level of a very short duration to submaximal effert ofa longer duration usin rest as a point of reference looking at 3 important features food stuff metabolizel relative contribution of each pathway and the production of lactic acid HLF Lecture 3 Notes Exercise Physiology 9415 0 Short duration exhausted in 2 minutes maximum intensity sprinted as hard as you could ATPPC Anaerobic Glycolysis some aerobic contribution under this condition you will never ever just get aerobic metabolism supporting that 2 min worth of max intensity carbohydrates in the form of muscle glycogen will use the energy stored ATP very quickly you will use the energy stored in GP to make more ATP very quickly and you will depend on anaerobic glycolysis to provide energy that is released by the derogation of blood glucose from muscle glycogen also very quickly And as time goes on you will have a little more contribution from aerobic metabolism i The longer the event the more aerobic the event will be 0 Long duration exhausted in 60 minutes submaximal intensity DIDN T GD OVER 0 Rest point of reference Aerobic Glycolysis Beta oxidation using a mixture of all three fuels Cll0 protein plays a small amount and fat a mixture of AQUA60 fats vs carbs seems like there will be NO lactate produced but in reality there is some lactate being produced 10mg per 100 mi of blood always some leaking in the system so it does produce SD ME lactate 0 Role of the liver and the muscle glycogen 0 Muscle glycogen stored in the skeletal muscle serves as energetics in that muscle 0 Liver glycogen NOT necessarily from energetics it serves as maintaining blood glucose levels REST SHQRT DURATION MAX ENERYGY FAT CHO ATPPC and Cl l O glycogen Anaerobic some aerobic HLA 175 mgdl Absence of oxy is the main contribution Aerobic Metabolism l lLA 392 10 mgdl small amount UNTRAlNED INDIVIDUAL How much does the level of training effect the amount of lactic acid Lactic Acid vs Oxygen consumption Start off on a treadmill with a fairly light pace measure how much oxygen is being consumed during that pace and then drawn a blood sample to see how much lactate was produced rest do it again and again until you exhaust I Lactate levels climb a little bit not a lot until we get to about 40 45 our maximum then goes higher and higher after that 39 Point of anaerobiosis H LA Lecture 3 Notes Exercise Physiology 9415 You train according to your lactate consumption point and you can effectively train better based on what that is You are able to manage the lactate up until that point and some people manage it better than others 0 We have the ability to buffer the acids and at the FDA we monitored it until buffer capacityquot Accumulated more and more bc you increase the max amount of energy 0 And when you increase the max amount of energy you begin to depend on another source of fuel Can you train and improve it We will take measurements and then you will train for several months aerobically come back and measure again What is happening at the point of anaerobiosis it has shifted direct result of the conditioning you have gone through for buffering capacity mm Passive Recovery Active Recovery 39 How do we manage the lactate we produce when we begin to recover from the exercise Pedaled all out for 60 sec and at the end they either sat on the bike with their legs propped up passive while they had blood samples taken or kept pedaling slowly on the bike active 0 Active Recovery is better if you want to get rid of lactate faster Significant differences I Active is superior removing lactic acid from 39 the system I 7 Le a 3 exora ce 3 we cover do Why is Active better B c you are circulating more blood that can pass lactate from the blood away from this system away from the muscles involved and take the lactate away to other places Lecture 3 Notes Exercise Physiology 9415 oxygen that we quJd quot ha w it Red A aonrumd Oxygen De cit period during which the level of oxygen consumed is below the level to supply all the ATP needs for any speci c intensity of exercise 0 You would prefer to have oxygen but due to the intensity of the activity it is impossible b c it takes time What enables us to go from rest to max ATPPC Anaerobic Metabolism and some contribution from aerobic Will always be in deficit when you conduct a max effort Never provide Z W i r I r l 5 2 large amounts of oxygen to support the OXV G V E 0531ij 7 C hu n activity and you have to rely on MED W mui dog 7 39 anaerobic sources to do so U9 l m Blood Lactate levels are severe Lactate main contributor to exhaustion in muscle if if glycogen 1 H Lack of fuel Inhibits muscle a contraction FATIGUE