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Truncated Estimation of Skating Force-Velocity Profiling When Using High-Speed Video-Based Methods Compared to

Jerome Perez1,2, Gaël Guilhem1, Franck Brocherie1

  • 1French Institute of Sport (INSEP), Laboratory Sport, Expertise and Performance (EA 7370), Paris, France.

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High-speed video analysis for ice hockey skating sprints provides less accurate force and power measurements compared to radar. While velocity measures are less affected, video methods reduce overall reliability for key performance indicators.

Keywords:
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Area of Science:

  • Sports Science
  • Biomechanics
  • Performance Analysis

Background:

  • Accurate assessment of force-velocity mechanical variables is crucial for optimizing athletic performance in ice hockey.
  • Radar-based systems are considered a gold standard for measuring these variables during dynamic movements like skating.

Purpose of the Study:

  • To compare the accuracy and reliability of high-speed video-based methods against a radar-based method for determining force-velocity mechanical variables during forward skating sprints.
  • To evaluate specific video analysis techniques, including those with and without time-shift corrections.

Main Methods:

  • Thirteen elite female ice hockey players completed 40-m forward skating sprints.
  • Force-velocity variables (Vmax, F0, V0, Pmax, FV slope, RFmax, Drf) were measured using radar and two high-speed video methods (ST and ST-TS).
  • Statistical comparisons and correlation analyses were performed between the methods.

Main Results:

  • Both video methods (ST and ST-TS) showed significant differences compared to radar for most variables, except V0 and Vmax with the ST method.
  • The ST-TS method resulted in significantly lower values for key determinants (Pmax, F0, RFmax, Drf) and overestimated velocity variables (V0, Vmax).
  • Correlations ranged from trivial (velocity) to very large (force, power), indicating substantial variability.

Conclusions:

  • High-speed video-based methods, particularly those without precise time-shift correction, offer lower accuracy and reliability for assessing ice hockey skating biomechanics compared to radar.
  • Practitioners should exercise caution when using video analysis for these specific variables, acknowledging potential limitations in precision and dependability.