Head Impact Telemetry System’s Video-based Impact Detection and Location Accuracy
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Head Impact Telemetry System’s Video-based Impact Detection and Location Accuracy

  • Published Date:

    Oct 2020

  • Source:
    Med Sci Sports Exerc. 52(10):2198-2206
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Public Access Version Available on: October 01, 2021, 12:00 AM information icon
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  • Alternative Title:
    Med Sci Sports Exerc
  • Description:
    Purpose: To quantify the Head Impact Telemetry (HIT) System’s impact detection and location measurement accuracy using an impact biomechanics data set paired with video of high school football special teams plays. Methods: The head impact biomechanics dataset and video were collected from 22 high school football players, wearing HIT System instrumented helmets, competing in 218 special teams plays over a single high school football season. We used two separate video analysis approaches. To quantify the impact detection accuracy, we evaluated the video for head impacts independently of the impact data collection triggers collected by the HIT System. Video observed impacts matched to the HIT System algorithm valid and invalid head impacts were categorized as true positives (TP), false positives (FP), false negatives (FN), and true negatives (TN). To quantify impact location accuracy, we analyzed video-synchronized head impacts for impact location independent of the HIT System’s impact location measurement and quantified the estimated percent agreement of impact location between the HIT System recorded impact location and the impact location observed on video. Results: The HIT System’s impact filtering algorithm had 69% sensitivity, 72% specificity, and 70% accuracy in categorizing true and non-head impact data collection triggers. The HIT System agreed with video observed impact locations on 64% of the 129 impacts we analyzed (unweighted k = 0.43, 95% CI: 0.31 – 0.54). Conclusion: This work provides data on the HIT System’s impact detection and location accuracy during high school football special teams plays using game video analysis that has not been previously published. Based on our data, we believe the HIT system is useful for estimating population based impact location distributions for special teams plays.
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