08 - Heart beat Breathing Chemical reactions Cellular processes 2/3 of total energy expenditure goes towards metabolism • 2 Physical Activity o

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nutri sci ENERGY 15:01 Energy (all energy comes from eating food and drinks) Conservation of energy o Energy is neither created nor destroyed Transformations of energy o Solar (all comes from the sun)-stored chemical (glucose)-chemical (fat)- chemical energy (reaction) or mechanical energy-ends up as heat!! Units Kilocalorie=calorie=kcal Food sources CHO 4kcal/gram Protein 4kcal/gram Fat 9kcal/gram Alcohol 7kcal/gram Energy Balance Weight reflects energy stores Energy intake (what we eat and drink)=energy expenditure o Positive energy balance-gaining weight-overweight o Negative energy balance-losing weight-underweight Energy expenditure 1. Basal metabolism (BMR) o Energy expenditure through involuntary activity only 
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Unformatted text preview: Heart beat Breathing Chemical reactions Cellular processes 2/3 of total energy expenditure goes towards metabolism • 2. Physical Activity o Voluntary muscular activity o Compare to BMR Sedentary person activity might equal only 20% of BMR Heavy person activity might equal 80-100% of BMR o Compare activities by time Sitting-25 kcal/hour Rowing, running, cross country skiing, (a lot of muscle groups in repetitive motion) 1000-1500 kcal/hour • 3. Thermic Effect of Food o digest, absorb, transport, store o energy cost of use o 10% of intake 15:01 15:01...
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This note was uploaded on 04/07/2009 for the course BIO 10167 taught by Professor Anderson,peterj. during the Fall '08 term at Wisconsin.

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08 - Heart beat Breathing Chemical reactions Cellular processes 2/3 of total energy expenditure goes towards metabolism • 2 Physical Activity o

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