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Dynamics of the Power-Duration Relationship during Intermittent Team Sports Exercise
Matthew I Black1, James A Lewis1, Yujie Liu1
1Public Health and Sports Science, University of Exeter Medical School, St Luke's Campus, Exeter, UNITED KINGDOM.
Medicine and Science in Sports and Exercise
|December 23, 2025
Summary
High-intensity intermittent exercise does not change critical power (CP) or W
Area of Science:
- Exercise Physiology
- Sports Science
- Human Performance
Background:
- The power-duration relationship is crucial for understanding endurance exercise performance.
- The W' balance (W'BAL) model is commonly used to predict exercise capacity.
- Team-sport athletes undergo intense intermittent exercise, impacting physiological responses.
Purpose of the Study:
- To investigate the effects of team-sport specific intermittent exercise on critical power (CP), W', and W' reconstitution kinetics (W'REC).
- To assess the accuracy of the W'BAL model in estimating W' balance during and after exercise.
- To determine if physiological variables explain exercise-induced changes in the power-duration relationship.
Main Methods:
- CP, W', and W'REC were measured using a repeated all-out test protocol.
- The test involved 3-min and 2-min all-out efforts separated by 90 seconds.
- Measurements were taken under rested (control) conditions and after 40-min and 80-min intermittent sprint tests (IST).
Main Results:
- CP and W'REC remained unchanged after both 40-IST and 80-IST compared to control.
- W' was significantly reduced following 40-IST and 80-IST.
- The W'BAL model accurately predicted W' balance after 40-IST but overestimated it after 80-IST.
Conclusions:
- Critical power and W' reconstitution kinetics are resilient to intermittent exercise.
- W' is depleted by intermittent exercise, with significant individual variability in power-duration relationship changes.
- The W'BAL model's applicability to intermittent exercise performance requires careful consideration due to potential overestimation.
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