OBJECTIVES: To examine the safety of cardiorespiratory fitness (CRF) assessment and training in the early sub-acute phase of recovery (<= 3 months) following moderate-to-extremely severe traumatic brain injury (TBI). METHODS: A systematic review was completed in accordance with the PRISMA guidelines. Studies investigating adults and adolescents >= 15 years with moderate-to-extremely severe TBI were considered for inclusion. The methodological quality of the included studies was evaluated according to the McMaster Guidelines for Critical Review Form - Quantitative Studies. RESULTS: Eleven studies with a total of 380 participants were included in the review. Adverse events (AEs) and symptom monitoring were poorly reported. Only four studies reported on the occurrence of AEs, with a total of eight AEs reported. Three of the reported AEs were concussion-like symptoms with no further exercise-induced symptom exacerbation reported. No serious AEs were reported. CONCLUSION: There is no evidence to suggest that CRF assessment and training is unsafe in the early sub-acute phase of recovery following moderate-to-extremely severe TBI. However, despite the low AE and symptom exacerbation rates identified, a timeframe for safe commencement was unable to be established due to poor reporting and/or monitoring of exercise-induced symptoms and AEs in the current literature.

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