Class Note for KIN 585 at UMass(21)
Class Note for KIN 585 at UMass(21)
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This 3 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at University of Massachusetts taught by a professor in Fall. Since its upload, it has received 14 views.
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Date Created: 02/06/15
KIN 585 Spring 2008 Dr Barry Braun Questions Lecture 1 To get everyone singing in the same key the questions for lecture 1 are actually an outline of the first lecture Matching Supply and Demand Transfer ofenergy from sun gt plants gt humans gt to the environment requires a lot of intermediate steps and interconversions between radiantchemicalmechanical energy In general plants are nothing like the sun sun is made up of helium and hydrogen with no CHO FAT PRO or water and has a temperature of several million degrees and puts out enough energy to power an entire solar system Plants are mainly composed of water 8090 fiber a lot of complex CHO starch some simple sugars a little protein and almost no fat They put out very little energy less than 10 kcalkg plant weightmin Mammals humans are a lot less watery 5060 have basically no ber very little CHO lt 1 of body weight lots of protein 1525 and lots of fat 1040 We put out a lot of energy relative to plants humans approx 115 kcalkg body weightmin at rest although not as much as the sun Myth 1 It turns out that we are not necessarily what we eat Humans and other animals are designed with the exibility to accommodate huge variations in metabolic rate mainly depending on the speed at which they move Humans can run almost 20 mileshr for short distances and can maintain speeds up to 12 mileshr for a few hours How do bodies provide the energy required to accommodate the range of metabolic demands from sitting in a classroom to hard exercise Resting metabolic rate for the average person is about 1500 kcalday 150024h60min approximately 1 kcalmin Running a 500 mile requires 20kcalmin an increase of 20x Running a marathon in 3h 20min you maintain a metabolic rate of about 13 kcalmin KIN 585 Spring 2008 Dr Barry Braun Challenge 1 provide the energy necessary to maintain the appropriate metabolic rate This is not trivial a need some mechanism to determine how much fuel is needed b some signal must be sent to the tissues in which energy is stored telling them to increase or decrease the breakdown ofthose energy stores 0 Some energy sources must be transported to the appropriate site cytosol or mitochondria of active muscle cells d There has to be some way to convert each energy source to a form that can be used to power muscle contraction Challenge 2 Provide a mixture of fuels appropriate to the metabolic demand Too much fat not enough CH0 9 cannot maintain high exercise intensity Too much CHO not enough fat 9 quickly deplete glycogen 9 fatigue Too much protein9 increased protein requirements or lose lean body mass Manv factors will influence the exact fuel mixture a Metabolic rate rest exercise etc b Environmental conditions eg heat cold high altitude c Nutritional conditions eg high GHQ diet low CHO diet d Sex differences eg male female phase of menstrual cycle e Pathological conditions eg diabetes growth hormone de ciency f Ergogenic compounds eg caffeine creatine Coenzyme Q10 How the body is designed to meet those 2 challenges is going to be the focus of this class The rst quarter of the course will mainly be centered around the mechanics of energy production The second quarter will be focused on the digestion absorption and storage of nutrients The third quarter is mainly related to energy metabolism in the fasting and exercising states The last quarter will be centered on energy balance and how perturbations in that balance alter body composition and potentially impact on overall health KIN 585 Spring 2008 Dr Barry Braun
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