Calorie Expenditure Charts For Physical Activity

Katch/Katch/McArdle

Sample Pages

Calories Produced By The Body

Human energy expenditure can be measured directly in a calorimeter similar to that used to determine the caloric content of food. A human calorimeter consists of a well insulated, airtight chamber with an oxygen supply so a person can live and work for an extended time period. Water is circulated through a series of pipes within the chamber. The heat produced and radiated by the person is absorbed by the circulating water. The change in water temperature reflects the individual's metabolic heat or energy release, and thus the total calories burned.

Figure 2. A human calorimeter measure calories expended during rest and physical activity. The chamber consists of an airtight, thermally insulated living chamber. The heat produced and radiated by the person is removed by a stream of cold water that flows at a constant rate through tubes coiled at the ceiling of the chamber. The difference in the temperature of water entering and leaving the chamber reflects the person's heat production.

Page 4

[Go to next sample page]

[How to Order] [Preface] [Table of Contents] [Reviews]

Return to Homepage