January 5, 2013

port performance


energy balance - energy intake same with energy output

positive intake - weight gain
negative intake - weight lose

nutrient and energy
energy capacity to do work
food become energy
fat + carbo + protein
using kilocalories as their unit

estimate kcal
bomb calorimeter
burn food - inrease water temperature

nutrient estimate

car - 4
fat - 9
protein - 4
alcohol -7

macronutrient and storage
cho protein and fat when they are not use will store as fat
adult need more protein 4 repair and build tissue

basal metabolism - min energy expended keep body alive
60-70% need
maintain heartbeat and respiration

influence
age
gender
body temperature
pregnancy

thermic effect - energy use for absorb and digest
5-10% energy need

measurement body energy
direct calorimetry
measure heat produce

indirect calorimetry
measure 02 use

harris benedict equation - estimate resting need

influence
age
gender
height
weight

why do you eat

hunger
physiological drive to eat
control by internal body

apettite
physilogicak drive to eat
absence to hunger

safety regulator

hypothalamus
feeding cell stimulate to eat
satiety cell stimulate to stop eat

sympathetic nervous system
activity increase - stop eat
activity decrease - eat

hormone

endorfine
cck
serotonin
nutrient effect

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