Lecture7-2009W

# Lecture7-2009W - Metabolic Rates(= rate of energy...

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Metabolic Rates (= rate of energy consumption) I. MR measurement A. Direct calorimetry - Antoine Lavoisier barb2right accurate but hard to measure B. Indirect calorimetry (1) based on respiratory exchange * respiratory exchange ratio (R) = respiratory quotient (RQ) = [CO2] produced / [O2] consumed (2) based on material balance R values during the aerobic catabolism of CHO, lipids & proteins * Ratio of heat production to O2 consumption and CO2 production Practice question1 : Calculate MR at an O2 consumption Of 10mL/min. (a) if CHO is oxidized? (b) if lipids are oxidized?

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Factors that affect MR MR by ingestion of food barb2right SDA (specific dynamic action) barb2right DIT, anti-obesity process (diet-induced thermogenesis) Basal MR vs. Standard MR 1. Basal MR barb2right heterothermies (mammals/birds) barb2right thermoneutral zone 2. Standard MR barb2right poikilothermies (fish/reptiles) barb2right fasting & resting state
MR and Body size Example: MR and Body size

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Unformatted text preview: M = aW b (allometric Eq) 2. Weight-specific MR M/W = aW (b-1) ♦ Physiological implications 1. number of mitochondria in fish swim muscles 2. heart size-heart rate-body weight ♦ Ecological implications 1. bomass vs. basal food requirement (BFR) * bomass: 3,500 mice (x 20g) = a 70,000g deer * BFR: 440 mice = 1 deer b/c mouse BFR=8x 2. MR vs. biomass of populations 3. MR vs. environmental pollutants 3. MR-body weight relation has physiological & ecological implications 1. Surface flow (by Max Rubner) S = V 2/3 S=r 2 , V=r 3 , r 2 =(r 3 ) 2/3 * for endothermies but allometric relation is also found in ectothermies 2. Fractal theory * scale independence, self-similarity, complexity, and infinite length * due to fractally structured transport systems 3. Multiple causes theory ♦ Why allometric metabolism-weight relations?...
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• Spring '09
• Tanda
• Max Rubner, I. MR measurement, Basal MR vs, Standard MR

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