Sex Differences in Pacing Profile and Reliability in a 4-km Cycling Time Trial

Area of Science:

• Exercise Physiology
• Sports Science
• Cycling Performance Analysis

Background:

• Sex differences in pacing strategies and day-to-day variability during endurance events remain underexplored.
• Understanding these differences is crucial for optimizing training and performance in both male and female athletes.

Purpose of the Study:

• To investigate sex-based differences in pacing profiles during a 4-km cycling time trial.
• To compare risk-taking behavior and pacing reliability between male and female cyclists.
• To determine if sex influences the day-to-day consistency of pacing strategies.

Main Methods:

• A cross-sectional study involving 32 cyclists (16 men, 16 women) performing two 4-km cycling time trials.
• Collected data on power output and ratings of perceived exertion during each trial.
• Calculated a hazard score (rating of perceived exertion * remaining distance) to assess risk-taking behavior.

Main Results:

• No significant sex differences were observed in pacing profiles (U-shaped), hazard scores, or performance reliability between trials.
• Both male and female cyclists demonstrated similar "U-shaped" pacing patterns and risk-taking behaviors.
• Women displayed a slightly higher day-to-day coefficient of variation in power output compared to men, indicating greater pacing variability.

Conclusions:

• Male and female cyclists exhibit comparable pacing profiles, risk-taking tendencies, and performance reliability in a 4-km time trial.
• Women may exhibit greater day-to-day variability in their pacing execution than men.
• Findings support tailored training monitoring and protocol prescription for female cyclists to address pacing variability.