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Updated: Dec 30, 2025

Determining the Contribution of the Energy Systems During Exercise
Published on: March 20, 2012
Alterations in energy system contribution following upper body sprint interval training
Michael B La Monica1, David H Fukuda2, Tristan M Starling-Smith2
1Department of Kinesiology, Missouri State University, 901 S National Ave, Springfield, MO, 65897, USA. MichaelLaMonica@MissouriState.edu.
Shorter work-to-rest ratios in sprint interval training (SIT) may boost adenosine triphosphate-phosphocreatine (ATP-PCr) system use during upper-body Wingate tests. This 2-week intervention enhanced ATP-PCr energy expenditure in trained men.
Area of Science:
- Exercise Physiology
- Sports Science
- Human Performance
Background:
- Sprint interval training (SIT) is effective for improving fitness.
- Understanding energy system contribution is crucial for optimizing training protocols.
- Upper-body SIT protocols are less studied than lower-body protocols.
Purpose of the Study:
- To investigate how varying work-to-rest ratios in upper-body SIT affect energy system utilization.
- To compare the impact of different SIT protocols on adenosine triphosphate-phosphocreatine (ATP-PCr), glycolytic, and oxidative energy systems.
Main Methods:
- Forty-two recreationally trained men were assigned to 10:2, 10:4, 30:4 SIT, or a control group.
- Participants completed six 2-week training sessions with 'all-out' sprints.
- Energy system contributions were assessed using pre- and post-intervention upper-body Wingate tests.
Main Results:
- The 10:4 work-to-rest ratio group showed significantly greater relative ATP-PCr energy contribution and expenditure compared to the control group.
- No significant differences in glycolytic or oxidative energy contributions were observed between groups.
- The 10:4 group demonstrated enhanced ATP-PCr system utilization post-intervention.
Conclusions:
- Shorter work-to-rest ratios in upper-body SIT may preferentially enhance ATP-PCr system utilization.
- A 2-week intervention with a 10:4 work-to-rest ratio can improve ATP-PCr system efficiency in the upper body.
- Further research is needed to explore the long-term effects and optimal ratios for different training goals.
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