Intensity Distribution of Collegiate Cross-Country Competitions

Area of Science:

• Sports Science
• Exercise Physiology
• Running Performance Analysis

Background:

• Understanding exercise intensity distribution is crucial for optimizing endurance training.
• Physiological markers like gas exchange threshold (GET) and critical velocity (CV) help define training zones.
• Comparing actual race performance with modeled predictions offers insights into training efficacy and race strategy.

Purpose of the Study:

• To analyze the intensity distribution during collegiate cross-country races.
• To compare actual race times (RT) with modeled performance times (MPT).
• To investigate the relationship between physiological markers and race performance metrics.

Main Methods:

• Participants underwent incremental treadmill tests for GET and 3-minute all-out tests for CV and D'.
• Physiological intensity zones were established using heart rate (HR) and running velocity (RV) based on GET and CV.
• Global Positioning System (GPS) watches and HR monitors were used to collect race data during competition.

Main Results:

• Athletes spent significantly more time in HR Zone 2 (37.6%) and Zone 3 (50.3%) compared to Zone 1 (12.1%).
• Athletes spent a significantly greater amount of time in RV Zone 2 (75.0%) compared to Zones 1 (8.4%) and 3 (16.7%).
• Actual race times (1499.5 s) were statistically slower than modeled performance times (1359.6 s).

Conclusions:

• Intensity distribution in collegiate cross-country races favors higher heart rates and lower running velocities.
• Modeled performance times overestimate potential race outcomes, likely because they do not account for race strategies.
• Environmental factors and differing physiological kinetics may influence the observed intensity distributions.