Related Experiment Video
Updated: Aug 9, 2026

Determining the Contribution of the Energy Systems During Exercise
Published on: March 20, 2012
A mathematical model for constituent ratios of energy expenditure in human
1Department of Nutrition and Food Hygiene, West China School of Public Health, Sichuan University, Chengdu 610041, China. wensanyu@tom.com
Abstract:
In order to assess the constituent ratios of energy expenditure in human, the deductive process of establishing a mathematical model for assessing the constituent ratios of the three major nutrients in energy expenditure in human was described in this paper. Total oxygen consumption, total carbon dioxide output and total nitrogen (urine nitrogen + skin nitrogen) excretion are related to the oxidation of the three major nutrients and the physiological combustion values of the three nutrients are already known. Based on these measurable and known parameters, the mathematical model established by the authors will help understand the characteristics of the tested individual's energy expenditure.
Related Concept Videos
Energy Balance
Energy Budgets and Reproductive Strategies
Mechanistic Models: Compartment Models in Individual and Population Analysis
Metabolic Rate
The Basal Metabolic Rate (BMR) measures the energy expended at rest.
Several factors influence the...
Kinetic Energy for a Rigid Body
Modeling with Differential Equations

