User's Guide

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HITsp does provide for a more specific correlation of on-field injuries and
impact exposure than single factors alone
1
.
ALERT TYPES
InSite provides two types of impact Alerts, “Single Impact” and “Multiple
Impact”. Both Alert types indicate that atypically high head-impact
exposure has been experienced by the player, and that clinical best
practices should be used to conduct an assessment for potential head
injury (concussion). Alert thresholds are customized based on level of
play and playing position on the field. Alerts report atypically high
exposure relative to other players of similar level of play at the same
playing position.
• Single Impact Alerts - Alerts impacts whose severities are above
the predetermined threshold for the player position and play
level as assigned using InSite Player Management software.
Single event Alerts exceed the 99
th
percentile HITsp value for
that skill level and playing position (i.e. the top 1%) based on
field data collected using the Riddell Sideline Response System.
• Multiple Impact Alerts - are a proprietary cumulative exposure
Alert created by a combination of:
1) Cumulative Impact Exposure Score – all impacts exceeding
the 95
th
percentile (i.e. top 5%) are added to a time-
weighted rolling 7-day index.
2) Magnitude of the most recent incoming impact.
When the sum of the cumulative index and the most recent
incoming impact exceeds a pre-determined cumulative
exposure threshold, a Multiple Impact Alert is generated. If a
Player has a high cumulative score, relatively small single
1
Greenwald RM, Gwin JT, Chu JJ, Crisco JJ., “Head impact severity measures for
evaluating mild traumatic brain injury risk exposure”, Neurosurgery, 2008 Apr,
62(4):789-98, discussion 798.