Kinesiology 3339A/B Lecture : Exercise Nutrition - Lecture 32

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oliveant147

9 Jan 2012

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Document Summary

We made an assumption that you were exercising at 3l a min (intensity), to convert from l of oxygen to calories = multiply each l by 5 (1 l = 5 calories) We used an intensity of 15 kcals per min. Only 20-25% of energy used goes to mechanical work. Humidity = air is saturated with water vapour, when this happens, you cant dissipate heat through sweating. If you were able to dissipate a l of sweat, yout sweat or control heat = body temperature goes up by 12 degrees in some cases, with increases of 4 degrees = denaturing of proteins. Different water compartments: water moves from one to another. as it does, the cells become dehydrated.

Related Questions

A) If you are going to run a marathon on a hot, humid, sunny day, what would you need to do regarding consumption of fluids, including carbohydrates and electrolytes before, during, and after the race? Why is this important - (discuss key guidelines for consuming water, electrolytes, and carbohydrates before, during, and after exercise during this strenuous activity). B) Discuss what happens to your body when you become dehydrated owning to excessive body water loss or lowered intake? (what happens to the blood, body cells, and organs, glands, and hormones).

brownhound170

Overall, 80% of the energy used by the body must be eliminated asexcess thermal energy and needs to be dissipated. The mechanisms ofelimination are radiation, evaporation of sweat (2430 kj/kg),evaporation from the lungs (38 kj/h), conduction, andconvection.
A person working out in a gym has a metabolic rate of 2500 kj/h.His body temperature is 37 degrees Celsius, and the outsidetemperature is 24 degrees Celsius. Assume the skin has an area of2.0 m^2 and emissivity of 0.97. (a) At what rate is his excessthermal energy dissipated by radiation? (b) If he eliminates 0.4 kgof perspiration during that hour, at what rate is thermal energydissipated by evaporation of sweat? (c) At what rate is energyeliminated by evaporation from the lungs? (d) At what rate must theexcess remaining excess energy be eliminated though conduction andconvection?

Could you please answer these questions