Analysis of cardiac induced brain forces using cranial accelerometry has been shown to diagnose concussion in high school athletes. This trial expands on this observation by recording headpulse signals in a recently concussed athletes playing Australian rules football.

Recently concussed athletes will have headpulse measurements obtained as soon after the clinically identified concussion as is feasible and at 1-3 day intervals over the course of a month. These recordings will pair with a self administered neurological symptom inventory (NSI) to track the athletes subjective concussion symptoms. Data from the prior study (AUSSIE-1) will be used to confirm the predictive value of the established algorithm

Concussion Subjects:

Inclusion Criteria:

• Diagnosed with sport related concussion
• first recording obtained within one week
• willingness to have multiple recordings in the month following concussion

Exclusions:

- head laceration

Control subjects:

Inclusion Criteria

• athletes without concussion over the last year
• willingness to have single or multiple recordings

Exclusion Criteria:

• head laceration

Recently concussed athletes playing Australian rules football. Controls are athletes of Australian Football or other sports without concussion for more than 1 year.