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Unformatted text preview: Temperature Depth Time:100’ 60’ 20’ 10’ 9mm 28m = 37min Temperature Regulation Homeotherm : organism that maintains a constant core temp despite change in ambient temperature. Advantage you can go anywhere: the con is that 60% of the energy of carbs and protein is wasted as heat energy. Pro: you can go anywhere. Poikilotherm – core temp dependant on ambient temperature: you are a slave of the environment. Temperatures: (extremities toes and fingers high 80’s), (blood supply trunk, skin, and head low 90’s): Rectal temperature 98.6 (37C). Muscle temperature can exceed 101-103, it depends if you are exercising does not reflect core temperature. Liver temperature is always 100 degrees since its always metabolic active and close to a blood supply. Internal “Range”: hyperthermia High Limit 107-108 above brain damage. Hyperthermia is common = people do exercise at high temps. Lower hypothermia 80 degrees . Would be unconscious, heart goes into fibrillation. The normal is 98.6F. Hypothermia is not common and its always a survival situation. Additive: we are like a radiator we expel heat. The key factor number one! There is always an additive factor and is METABOLISM . As long as you are alive its always going on. At rest one calorie a minute. During exercise 10-15-20 calories per minute. Heat Loss/Gain: 1) Radiation – transfer of heat by electromagnetic waves. Basically change in temperature. Temp. differential. If the heat inside the body is 100 and the environment temp is 100 you cant loose heat. Only when the ambient temp. is lower than your body temp you can loose heat. If the outside is hotter than then inside temp of body you gain heat. The ambient temperature dictates how much heat you loose or gain you. When the heat is inside the deep tissues the heat can dissipate very fast by the blood rather than the tissues. The blood transports it to the periphery from the deep core. The factors involved: Example: Fat man, muscle man, and skinny man. Which individual can dissipate heat? Explanation: surface area is the skin squared meters. There are two variables: mass and linear height. The linear height is the stronger influence in surface area . A taller one has larger surface area. Equation: SFA/Mass. Research shows that low surface area to mass ratio has a disadvantage in heat loss by radiation. Football align men – 90% of them are victims of their own mass and cant expel heat. Skinny – advantage in heat loss. The ability to do this is genetic. Light waves: if you have white skin and the light waves hit, which one is the reflective? The white skin reflects it. If one wears black, one retains a lot of heat. One must wear light color to reflect the waves....
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This note was uploaded on 10/28/2010 for the course EXSC 205Lxg taught by Professor Girandola during the Spring '07 term at USC.
- Spring '07