What do your HIT numbers mean?

Discover the traffic light system in your HIT app

Green

Green impacts reflect typical, low-force movements that are common and expected in your sport or activity.
These events are usually not concerning and do not require follow-up. 

 

Response: No action is necessary. Continue activity as normal while maintaining regular monitoring. 

Amber

Amber impacts indicate forces that are above average and may represent a greater load than your body is used to.
While not immediately dangerous, they should be approached with caution. 

Response: 

  • If a single amber impact occurs, monitor for symptoms (e.g., dizziness, confusion, fatigue). 
  • If multiple amber impacts are recorded in a session or week, take precautionary measures as you would for
    a red impact - this may include rest and observation. 
  • Use clinical judgment or consult with a coach or healthcare provider if unsure. 

Red

Red impacts signify high-force events that may carry a significant risk of injury,

including concussion or soft tissue trauma. 

 

Response: 

  • Stop activity immediately. 
  • Monitor for any signs or symptoms (headache, confusion, balance issues, nausea, etc.). 
  • HIT recommends that all users experiencing a red impact consult a healthcare professional
    promptly for assessment and guidance. 

Similarly, we can just state combined with a large impact, High Rad/s rotational force alongside indicates a much higher initial severity of impact and should be factored into decision making of seeking medical attention as brain injury could potentially be much more severe. 

In the context of head impacts, rotational acceleration is strongly linked to the risk and severity of brain injury, including concussion, diffuse axonal injury (DAI), and long-term degenerative diseases like CTE (Chronic Traumatic Encephalopathy). While a single high linear impact can be dangerous,
it’s often the rotational component that causes the most neurological disruption.  

For HIT users, tracking rad/s helps detect invisible but dangerous forces, especially in sports with frequent or awkward collisions (e.g., rugby, diving, hockey). When rotational acceleration exceeds certain thresholds—typically around 54 to 74 rad/s—the risk of concussion increases dramatically. By monitoring this data, athletes and clinicians can make more informed decisions about when to rest, assess, or intervene to protect brain health. 

Understand what HIT means for you.

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