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Table 2 Cross tabulation of frequency of verified in-game impacts measured by the x-patch™, video-verified impacts, player position, and game time

From: Verifying Head Impacts Recorded by a Wearable Sensor using Video Footage in Rugby League: a Preliminary Study

  Playing position Player time in game (min) Sensor-recorded in-game impacts Video-verified game impacts Percentage of impacts verified Video-verified impacts per game hour Video-verified direct impacts Video-verified direct impacts per game hour
Player 1 Forward 365 29 29 100 4.8 15 2.5
  Back 687 62 53 85.5 4.6 41 3.6
Player 2 Forward 259 63 62 98.4 14.3 27 6.3
Player 3 Back 1120 73 73 100 3.9 49 2.6
Player 4 Forward 568 182 180 98.9 19.0 155 16.4
Player 5 Back 808 126 105 83.3 7.8 85 6.3
Player 6 Forward 505 74 68 91.9 8.1 44 5.2
Player 7 Back 614 97 94 96.9 9.2 67 6.5
Player 8 Forward 420 73 68 93.2 9.7 53 7.6
Total 5346 779 732 94.0 8.2 536 6.0
  1. Season totals. Player 1 played in both forward and back positions during the season. Sensor-recorded impacts were ≥ 20gs