Symptom Exacerbation and Adverse Events During a Randomized Trial of Early-Stage Rehabilitation After Sport-Related Concussion: Safety Outcomes From the Active Rehab Study.

Researchers in this trial wanted to know whether two different rehabilitation approaches after sports concussion were safe to use. They recruited 251 athletes across professional rugby, professional football, college, and high school sports in three countries. One group did graded return-to-sport exercises alone, while the other group started with symptom-directed exercises early on and then progressed to return-to-sport training.

Across over 1,400 rehabilitation sessions, both approaches produced similarly low rates of symptom flare-ups during sessions, and serious adverse events were extremely rare. The findings suggest that medically supervised concussion rehabilitation using either approach carries a reassuringly small risk of making symptoms temporarily worse.

This study followed athletes recovering from concussion to see whether two types of supervised rehabilitation were safe. The athletes either did graded return-to-sport activities or started with early exercises designed to manage their specific symptoms before moving into sport-specific training.

Across thousands of sessions, symptom flare-ups during a single session happened in roughly one out of every six sessions in both groups, and serious problems were rare. When symptoms did get worse during a session, they typically settled back down by the next visit.

The research suggests that working with a healthcare team on a structured rehabilitation plan after concussion appears safe, though as with any recovery process, some temporary ups and downs may happen along the way.

This is a summary of research, not medical advice. Talk to your own healthcare provider about anything affecting your care.

This cluster RCT provides useful safety data on early concussion rehabilitation across multiple sport levels and settings. The two interventions represent a genuine contrast: graded exertion alone versus early symptom-directed exercise followed by graded exertion.

Intrasession symptom exacerbations were equivalently low in both groups at approximately 16 percent, suggesting that supervised activity-based rehabilitation does not routinely trigger substantial symptom worsening during sessions. Clinically significant intersession exacerbations (10+ point increases on the 132-point symptom scale) were rare, and the vast majority resolved within one session.

The study does not compare outcomes or recovery speed between groups, so it cannot speak to relative effectiveness, only to safety. The findings add to a limited evidence base showing that medically supervised early rehabilitation after concussion carries manageable safety profiles in organised sports settings.