Effect of Aerobic Exercise on Symptom Burden and Quality of Life in Adults With Persisting Post-concussive Symptoms: The ACTBI Randomized Controlled Trial.

Objective: To evaluate a 6-week sub-symptom threshold aerobic exercise protocol (AEP) versus a stretching protocol (SP) on symptom burden and quality of life (QoL) in adults with persisting post-concussive symptoms (PPCS).

Design: The Aerobic exercise for treatment of Chronic symptoms following mild Traumatic Brain Injury (ACTBI) Trial was a randomized controlled trial with 2 groups.

Setting: Outpatient brain injury, pain, and physiotherapy clinics.

Participants: A total of 210 participants were screened. A consecutive sample of 52 adults with PPCS and exercise intolerance after mild traumatic brain injury were enrolled. No participants withdrew because of the adverse effects of the intervention.

Interventions: Participants were randomized to a 6-week AEP (n=27) or 6-week SP (n=25).

Main outcome and measures: The Rivermead Post Concussion Symptoms Questionnaire was the primary outcome. Secondary outcomes included QoL using the QoL After Brain Injury Questionnaire, in addition to measures of mood, anxiety, functional impact of headache, fatigue, dizziness, exercise tolerance, and sleep.

Results: Participants were a mean (SD) of 43.0 (10.9) years old (75% female) and 24.7 (14.0) months post-injury. In per-protocol analysis, between-group difference (AEP vs SP) was not significant for the Rivermead Post Concussion Symptoms Questionnaire, but QoL After Brain Injury Questionnaire between-group difference was significant (mean change=5.024; 95% Cl, 0.057-9.992; P=.047) from baseline to 6 weeks. In the intention-to-treat analysis, between-group changes in primary and secondary outcomes were not significant.

Conclusions: This trial provides preliminary data to support the prescription of aerobic exercise for adults with PPCS. Despite presenting with exercise intolerance, participants were able to engage in subsymptom threshold exercise with QoL benefits.