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Updated: May 23, 2026

Determining the Contribution of the Energy Systems During Exercise
Published on: March 20, 2012
Determining the contribution of the energy systems during exercise
Guilherme G Artioli1, Rômulo C Bertuzzi, Hamilton Roschel
1Laboratory of Applied Nutrition, School of Physical Education and Sport, University of Sao Paulo.
This study introduces a novel method to measure energy system contributions in sports difficult to replicate in labs. It quantizes aerobic, alactic anaerobic, and lactic anaerobic systems for enhanced ecological validity in exercise science.
Area of Science:
- Exercise Physiology
- Sports Science
- Metabolic Demand Analysis
Background:
- Assessing the metabolic demand of physical activities is crucial for understanding energy system contributions.
- Many sports are challenging to replicate in controlled laboratory settings, limiting research on their specific energy system utilization.
- Existing methods often struggle to differentiate the contributions of the three primary energy systems.
Purpose of the Study:
- To present a novel method for assessing the differential contribution of aerobic, alactic anaerobic, and lactic anaerobic energy systems.
- To provide a framework applicable to sports and exercises that are difficult to mimic in controlled laboratory environments.
- To enhance the ecological validity of energy system research in sports.
Main Methods:
- Utilizes physiological variables: rest/exercise/post-exercise oxygen consumption and rest/peak plasma lactate.
- Calculates aerobic metabolism contribution using the trapezoidal method on oxygen consumption data.
- Determines alactic anaerobic metabolism via exponential modeling of post-exercise oxygen consumption.
- Quantifies lactic anaerobic system contribution using peak plasma lactate, body mass, and a conversion factor.
Main Results:
- The method successfully quantifies the distinct contributions of the aerobic, alactic anaerobic (ATP-CP), and lactic anaerobic energy systems.
- The approach is adaptable for both continuous and intermittent exercise protocols.
- It offers a unique capability to differentiate the metabolic contributions of all three energy systems.
Conclusions:
- This method provides a valuable tool for studying energy system contributions in ecologically valid sports settings.
- It overcomes limitations of laboratory-based assessments for complex physical activities.
- Enables a more comprehensive understanding of metabolic demands across diverse sports and exercises.
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