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Within-Match PlayerLoad™ Patterns During a Simulated Soccer Match: Potential Implications for Unit Positioning and
Steve Barrett1, Adrian W Midgley, Christopher Towlson
1Dept of Sport, Health and Exercise Science, University of Hull, Kingston Upon Hull, UK.
Summary
PlayerLoad (PL) monitoring during soccer simulations is reliable, with the center of mass (COM) location detecting movement strategy changes for fatigue management. Scapulae (SCAP) placement requires cautious interpretation of lower-limb movement data.
Area of Science:
- Sports Science
- Biomechanics
- Human Movement Analysis
Background:
- Triaxial accelerometry, including PlayerLoad (PL), quantifies athlete load.
- Understanding PL variations across anatomical locations is crucial for accurate load monitoring.
- Standardized soccer match simulations (SAFT90) provide a controlled environment for such assessments.
Purpose of the Study:
- To evaluate acute changes in triaxial accelerometry (PlayerLoad [PL(VM)]) and its axial planes (PL(AP), PL(ML), PL(V)) during a 90-min soccer match simulation (SAFT90).
- To determine the test-retest reliability of these measures.
- To assess the influence of device anatomical location (scapulae [SCAP] vs. center of mass [COM]) on the data.
Main Methods:
- Semiprofessional and university soccer players (n=20) participated in 3 SAFT90 trials.
- PlayerLoad and its axial components were measured using micromechanical-electrical systems (MEMS).
- Devices were positioned at the scapulae (SCAP) and near the center of mass (COM).
Main Results:
- PlayerLoad (PL(VM)) showed no between-halves differences, but within-half increases occurred at the COM (1st half) and SCAP (1st half).
- Vertical (PL(V)) and mediolateral (PL(ML)) components contributed most to PL(VM) from SCAP and COM, respectively.
- Measures were significantly greater at the COM compared to the SCAP for PL(VM), PL(AP), PL(ML), and PL(V).
- High test-retest reliability (ICC .80-.99) was observed for all measures at both locations.
Conclusions:
- PlayerLoad and its axial planes are reliable during SAFT90.
- COM placement effectively detects within-match changes in movement strategy, aiding fatigue management.
- Data from SCAP placement should be interpreted cautiously when inferring lower-limb movement strategies.
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