Intensity Matters: Effect of Different Work-Matched Efforts on Subsequent Performance in Cyclists

Area of Science:

• Exercise Physiology
• Sports Science
• Cycling Performance

Background:

• Understanding training intensity effects on performance is crucial for optimizing athletic development.
• Work-matched training sessions allow for direct comparison of intensity-specific fatigue.
• Cyclists' ability to sustain power output is a key performance determinant.

Purpose of the Study:

• To evaluate the impact of two distinct work-matched training intensities on subsequent cycling performance.
• To compare the fatigue induced by moderate-intensity continuous training versus high-intensity interval training.

Main Methods:

• Randomized controlled crossover design involving 12 junior cyclists.
• Assessment of power-duration relationship via 2, 5, and 12-minute field tests.
• Training interventions included moderate-intensity continuous training (60-70% CP) and high-intensity interval training (110-120% CP), matched for total work.

Main Results:

• High-intensity interval training significantly reduced 2-minute test power output compared to both control and moderate-intensity sessions.
• High-intensity interval training led to significantly lower W' values compared to both control and moderate-intensity sessions.
• No significant differences in performance were observed for 5-minute and 12-minute tests, or for critical power (CP) across conditions.

Conclusions:

• High-intensity intermittent training induces greater fatigue, particularly affecting short-duration power and W', compared to moderate-intensity continuous training.
• The specific fatigue profile differs between training modalities, with high-intensity intervals having a more pronounced short-term impact.