Question 3 A 65-kg woman cycles on the leg ergomater at a 7.6 Met workload. What would be her energy expenditure from a 30-minute ride? 259 kcals 37 kcals 100 kcals 7.8 kcals Question 4 A 65-kg woman cycles at 80 watts on the leg ergometer. Her VO2 at this level is: 13.6 ml/kg/min 27 ml/kg/min 9.2 ml/kg/min 5.8 Mets Question 5 If Frank expends 90 kcals/exercise session, how many sessions must he complete to reach his goal of losing 1 lb. of fat? 17 sessions 23 sessions 39 sessions 13 sessions None of the above
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6 Met workload for 30 minutes. The formula to calculate energy expenditure in kcals is: Energy expenditure (kcals) = MET value × weight in kg × duration in hours Show more…
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Madhur L.
The metabolic rate (i.e. the energy expended) when a human is cycling at $15 \mathrm{km} \mathrm{h}^{-1}$ is approximately $1650 \mathrm{kJ} \mathrm{h}^{-1} .$ (a) If the heat capacity of the human body is $3.47 \mathrm{kJ} \mathrm{K}^{-1} \mathrm{kg}^{-1},$ what would be the temperature rise of the body of a $53 \mathrm{kg}$ woman cycling for $1 \mathrm{h}$ at $15 \mathrm{kmh}^{-1}$ if there were no heat exchange to the surroundings? (b) Given that the human body must maintain a temperature of $37 \pm 1^{\circ} \mathrm{C},$ what physiological mechanisms are in place for the cyclist not to suffer from hyperthermia? (c) The heat capacity of water and of fat are 4.18 and $1.88 \mathrm{kJ} \mathrm{K}^{-1} \mathrm{kg}^{-1},$ respectively. What effect does obesity have on the change in body temperature and the need for the body to control the latter during a 30 min cycle ride at $15 \mathrm{km} \mathrm{h}^{-1} ?$ [Data: J. N. Spencer (1985) $J . \text { Chem. Educ., vol. } 62, \text { p. } 571 .]$
Bicycle riding at 13 miles per hour (a moderate pace) consumes 2000 kilojoules of energy per hour for a 150 -pound person. How many miles must this person ride in order to lose one pound of body fat if fat provides 39 kilojoules of energy per gram?
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