What do your
HIT numbers mean?
Discover the traffic light system in your HIT app — designed to turn complex impact data into clear, actionable guidance for athletes, coaches, and parents.
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.
- 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.
- 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.
- 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.
Why Rad/s matters
as much as G-force
A high linear impact combined with high rotational acceleration (Rad/s) significantly increases the initial severity of an impact and should factor into any decision about seeking medical attention — as the potential for brain injury can be considerably more severe.
In the context of head impacts, rotational acceleration is strongly linked to the risk of concussion, diffuse axonal injury (DAI), and long-term degenerative diseases like CTE. While a single high linear impact is dangerous, it is often the rotational component that causes the greatest neurological disruption.
Invisible Forces
HIT tracks Rad/s to detect dangerous rotational forces that are invisible to the naked eye — especially in sports with frequent or awkward collisions like rugby, hockey, and diving.
Brain Injury Risk
Rotational acceleration is strongly associated with concussion, diffuse axonal injury (DAI), and long-term conditions such as CTE (Chronic Traumatic Encephalopathy).
Informed Decisions
By monitoring Rad/s data alongside G-force, athletes and clinicians can make more informed decisions about when to rest, assess further, or intervene to protect brain health.
Understand what HIT
means for you.
Every number in your HIT app tells a story about the forces your body is experiencing. Learn how to read that data and act on it with confidence.
Find Out More