How is cumulative head impact exposure quantified?

Cumulative Exposure Index (CEI) combines total number of impacts, mean linear and rotational acceleration, and risk-weighting for high-magnitude events. NFL linemen accumulate 1,000-1,500 subconcussive impacts per season.

Does CTE risk increase linearly with years of play?

Evidence suggests a threshold or dose-response relationship. Boston CTE Center data shows risk increases significantly after 4-5 years of tackle football, particularly before age 12 during critical brain development windows.

CTE Risk from Cumulative Concussive and Subconcussive Exposure

Estimate cumulative head impact exposure and CTE risk based on career length, sport, and position. Subconcussive impacts (NFL linemen: 1000-1500/season) may contribute as much as symptomatic concussions.

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CTE Risk from Cumulative Concussive and Subconcussive Exposure

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Frequently Asked Questions

How is cumulative head impact exposure quantified?

Does CTE risk increase linearly with years of play?