Comparing Sampling Frequencies to Measure Collective Tactical Variables During Soccer Training

Area of Science:

• Sports Science
• Biomechanics
• Performance Analysis

Background:

• Microsensor sampling frequency can influence the accuracy of tactical variable measurements in team sports.
• Understanding this impact is crucial for reliable analysis of soccer training dynamics.

Purpose of the Study:

• To evaluate how different sampling frequencies affect the measurement of collective tactical variables in U16 male soccer players.
• To determine the optimal sampling rate for accurate assessment of tactical behavior during training.

Main Methods:

• Collected data from 16 U16 male soccer players during a 7+goalkeeper-a-side match.
• Utilized an inertial measurement unit (IMU) based system to track player positions.
• Measured change in geometrical center position (cGCp), mean distance between players (mean-DbP), and total area (TA) at 10, 4, 2, and 1 Hz sampling frequencies.

Main Results:

• Significant differences were observed in cGCp across all sampling frequencies (p < 0.01).
• Mean-DbP showed significant differences between 10 Hz and other frequencies (p < 0.05).
• No significant differences were found for TA across any sampling frequencies (p > 0.05).

Conclusions:

• Sampling frequency impacts the measurement of cGCp and mean-DbP, but not TA.
• Researchers should exercise caution when comparing tactical behavior studies using different sampling frequencies for GC-related and distance variables.
• Lower sampling frequencies may suffice for measuring area-based tactical variables in soccer.