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Related Experiment Video

Updated: Dec 8, 2025

A Test Bed to Examine Helmet Fit and Retention and Biomechanical Measures of Head and Neck Injury in Simulated Impact

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

Kody R Campbell, Stephen W Marshall¹, Jason F Luck²

¹Injury Prevention Research Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC.

Medicine and Science in Sports and Exercise

|September 16, 2020

Summary

The Head Impact Telemetry (HIT) System accurately detects head impacts in high school football, showing 70% accuracy. Its location measurement agreement with video analysis was 64%.

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Area of Science:

Sports Biomechanics
Injury Prevention Technology

Background:

High school football involves significant head impacts.
Accurate measurement of head impacts is crucial for understanding injury mechanisms.
The Head Impact Telemetry (HIT) System is used to monitor head impacts in athletes.

Purpose of the Study:

To quantify the accuracy of the Head Impact Telemetry (HIT) System in detecting head impacts.
To assess the accuracy of the HIT System's impact location measurement.
To evaluate HIT System performance during high school football special teams plays.

Main Methods:

Collected head impact biomechanics data and video from 22 high school football players over one season.
Analyzed 218 special teams plays using two video analysis approaches.
Quantified impact detection and location accuracy by comparing HIT System data with independent video observations.

Main Results:

The HIT System's impact-filtering algorithm achieved 69% sensitivity, 72% specificity, and 70% accuracy.
The HIT System demonstrated 64% agreement with video-observed impact locations (unweighted k = 0.43).

Conclusions:

This study provides novel data on HIT System accuracy during game play.
The HIT System is considered useful for estimating population-based impact location distributions in football.
Further validation of head impact monitoring systems is essential for player safety.