Exercise in Postconcussion Symptoms and Posttraumatic Headache

The goal of this clinical trial is to compare two models of delivery of guided exercise in patients with exercise intolerance after mild head injury. The main question it aims to answer is: • Is a program that includes elements of in-house exercise and follow-up sessions, and repeated treadmill testing, superior to a program with telephone-based follow-up only? Participants will undergo a treadmill test to determine eligibility for the study, and to determine at what intensity level their symptoms worsen (symptom threshold). Thereafter they will exercise 15-20 minutes, 3-5 times per week at 80-90% of the heart rate that was found to be the symptom threshold. One group will receive face-to-face folllow-up and repeated testing, one group will receive telephone-based follow-up only . Researchers will compare these two groups to see if closer follow-up is superior when it comes to recovery from exercise intolerance after 12 weeks of exercise.