ENS 304 Lecture Notes - Lecture 4: Vo2 Max, Metabolic Equivalent, Spirometer
24 Jul 2020
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Document Summary
Indirect calorimetry: the estimation of energy expenditure through the measurement of inspired and expired o2 and co2 gas volumes and concentrations. Energy expenditure: collecting gas during exercise or at rest allows us to estimate the relative energy requirement. Food + o2 (respiration) heat + atp (work) heat. Vo2: volume of oxygen consumed per minute. Vco2: volume of carbon dioxide exhaled per minute. Mets: metabolic equivalent for the standard amount of energy utilized at rest. Pneumatochometer: type of spirometer that measures gas volumes. Respiratory exchange ratio (rer): ratio of consumed oxygen and exhaled co2 that represents fuel used to produce atp. Fats: 9 kcal = 1 gram (0. 7 rer) Carbs: 4 kcal = 1 gram (1. 0 rer) Vt2 is the point where fuel usage switches almost 100% to carbs for fuel. Gluconeogenesis: formation of glucose from other non- glycogen substances such as amino acids, glycerol, and lactate. Storage in adipose tissue or intramuscular triglycerides in the cell.
