How do swimmers pace the 400 m freestyle and what affects the pacing pattern?

Area of Science:

• Sports Science
• Physiology
• Swimming Performance Analysis

Background:

• Understanding pacing strategies is crucial for optimizing performance in endurance swimming events like the 400m freestyle.
• Elite swimmers' pacing patterns and their relationship with physiological parameters require further investigation.

Purpose of the Study:

• To analyze the pacing patterns of elite 400m freestyle swimmers.
• To compare 400m race pacing with 200m race pace.
• To correlate critical speed (CS) and D' with pacing parameters.

Main Methods:

• Analysis of historical 400m and 200m freestyle race data from elite swimmers.
• Calculation of critical speed (CS) and D' based on 200m and 400m performance data.
• Examination of 50m split times to determine pacing variations.

Main Results:

• Most elite 400m freestyle swimmers exhibit a parabolic pacing pattern.
• A significant correlation was found between 400m and 200m performance.
• The difference between 200m performance and split times strongly correlated with critical speed (CS) and D', with a near-perfect correlation between D' and the difference between average speed and CS.

Conclusions:

• The common recommendation for the first half of a 400m race to be 4-5 seconds slower than a 200m race pace may not be universally applicable.
• Optimal pacing strategies are individualized and depend on a swimmer's specific physiological capabilities, particularly their critical speed and D' values.