HSS 2342 Lecture Notes - Lecture 26: Basal Metabolic Rate, Energy Economics, Thermogenesis

• School: University of Ottawa
• Department: Health Sciences
• Course: HSS 2342
• Professor: Keir J Menzies

Document Summary

Energy balance: energy in ~ energy out: a shift in balance causes weight changes, rapid changes are not just fat changes, fat changes are gradual, 1 pound of fat = 3500 kcalories. Excess energy is stored as fat: fat is used for energy between meals. Weight of muscle versus fat: 1 liter of muscle weighs 2. 3 pounds, while 1 liter of fat weighs 1. 98 pound. Energy out: components of energy expenditure: thermogenesis, bmr (basal metabolic rate) (50-65%) Physical activity (estimate: see pg 256 table 8-3) Body composition and size (more body weight; or muscle weight= higher bmr) Growth (more energy used) age (decline in bmr) Defining healthy body weight: body mass index (bmi) Bmi calculation bmi = weight (kg)/height (m)2: underweight: < 18. 5 ; healthy weight: 18. 5 to 24. 9 ; overweight: 25. 0 29. 9 ; obese: 30. 0+ The bmi may not accurately assess health risks in: Less than18 years who have not reached full growth.