BIOL-242 Lecture Notes - Lecture 57: Basal Metabolic Rate, Cellular Respiration, Thyroid Hormones
16 Jun 2020
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Chapter 24 part 9 | basal metabolic rate (bmr) & heat. Total heat produced by chemical reactions and mechanical work of body. Directly calorimeter measures heat liberated into water chamber. Indirectly respirometer measures oxygen consumption (directly proportional to heat production) Reflects energy body needs to perform its most essential activities. Measured in postabsorptive state (npo 12 hours), reclining position, relaxed mentally and physically, room temperature 20-25c. Recorded as kilocalories per square meter of body surface per hour (kcal/m2/h) E. g. , 70 kg adult bmr = 66 kcal/h. Influenced by body surface area, age, gender, body temperature, stress, thyroxine. Bmr increases as ratio of body surface area to volume increases. Males have disproportionately higher bmr than females. Thyroxine increases oxygen consumption, cellular respiration, and bmr. Physical training has little effect on bmr. Rate of kilocalorie consumption to fuel all ongoing activities. Increases with skeletal muscle activity and food ingestion ( food-induced thermogenesis )
