News by Levels · Level 3 · Student worksheet

Concussion Study Highlights Linear Acceleration

In this lesson: Separate predictive strength from a claim of harmlessness.

Name: __________________________ Date: __________________

Read the story

A Stanford study published on November 9 found peak linear acceleration more predictive of concussion than peak rotational acceleration in athletes’ mouthguard data.

The sample covered 203 athletes and seven sports. Because actual collisions usually combine linear and rotational motion, the result should not be interpreted as evidence that rotation is harmless.

Source: Stanford Medicine via Brightsurf, 2026-11-09. https://www.brightsurf.com/news/L592XN78/concussion-study-upends-understanding-of-what-makes-head-impacts-dangerous.html

Read and practise

1. Which interpretation is justified?

   1. Rotational movement cannot cause harm
   2. Every impact has identical risk
   3. Linear acceleration was more predictive within the studied data

2. Why would harmless rotation be an overstatement?

   1. Actual collisions usually combine both motions
   2. The study isolated all rotation from linear movement
   3. A stronger prediction for one motion proves the other is safe

Your turn

Summarise both the study’s result and the limit on interpreting it.

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Read online: https://newsbylevels.com/news/stanford-mouthguard-linear-head-impact-study-november-2026/level-3/