Kinesiology 3339A/B Lecture Notes - Lecture 28: Building Material, Solution, Semipermeable Membrane
19 Oct 2016
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Fluids (water: 50-70% of body mass (weight); is essential for life; is a nutrient that you require and will die without it. Regulating body core temperature becomes difficult to do with dehydration. Athletes can approach 4 l/h which occurs with adaptation of increased sweating through increased sweat production to cool off body: heat production during exercise is substantial. Only 20-25% of energy used goes to mechanical work the rest 75% goes to heat production: calculate exercise bout heat production: assume 1 hour of exercise at a vo2 = 3 l/min. 3 l/min x 5kcal/l (vo2 x energy equivalent) = 15 kcal/min (energy expenditure) x 0. 75 (heat production at exercise) = 11. 25 kcal/min (heat that is produced each minute of exercise) Specific heat of water = 1. 0 kcal/kg/degree c. In a 70 kg individual, it would take 58. 1 kcal to raise body temperature 1 degree c. As a result with 675 kcal heat production, core temperature would increase 11. 6 degrees c.
