Table 1.

HeadOn intervention components.

Intervention component	Description	Task
Overview	HeadOn is a digital health intervention designed to support patients who have experienced a concussion. It contains 5 stages, each of which lasts 7 days. Each stage is introduced with an audio clip providing the patient with information about the stage and associated tasks.	Watch introductory video (one-off task)
Introduction	An introductory video explains what HeadOn is and how to use it. The patient is then invited to complete a series of questionnaires (Rivermead Post-Concussion Symptom Questionnaire and PHQ-9a).	Complete Rivermead questionnaire and PHQ-9 (one-off task)
Understanding your symptoms	The first week of HeadOn focuses on providing patients with information about postconcussion symptoms and techniques for managing them. This includes access to health information (including symptom-specific information and also frequently asked questions). The patient is also invited to complete a daily symptom diary and is able to view their data in the Progress Tracker area.	Complete symptom diary (recurring daily task)
Sleep after a concussion	The second week of HeadOn focuses on sleep disturbance after a concussion. The audio introduction provides the patient with important information on good sleep hygiene. The patient is also invited to set a wake-up time and bedtime for the week. They are notified by HeadOn when this time comes.	Set wake-up and sleep times (one-off task)
Lifestyle and exercise	The third week of HeadOn focuses on 2 areas: physical activity and examining alcohol consumption. All patients are invited to set 3 days of the week to perform noncontact physical activity. If the patient indicates that they had consumed alcohol at the time of the concussion, they are invited to set 3 alcohol-free days of the week and use an alcohol tracker to monitor the number of alcoholic units that they drink throughout the week.	Set exercise days (one-off task); set alcohol-free days and use alcohol tracker (one-off tasks)
Your thoughts	The fourth week of HeadOn focuses on examining the patient’s thoughts regarding their concussion. The audio introduction discusses CBTb concepts regarding the role of thoughts on behavior and emotion. The patient is invited to use a thought diary to explore their thoughts regarding their concussion.	Complete the thought monitor (one-off task)
Getting back to baseline	The final week of HeadOn focuses on supporting the patient to return to their preinjury function. During this week, the patient is invited to set a goal to complete by the end of the program. They are encouraged to use the SMARTc approach to set and complete the goal. The patient uses the HeadOn goal-setter function, which provides reminders throughout the week.	Set goal using HeadOn goal setter (one-off task)
Completion	On completion of the HeadOn program, the patient is invited to retake the same series of questionnaires (Rivermead Post-Concussion Symptom Questionnaire and PHQ-9).	Complete Rivermead questionnaire and PHQ-9 (one-off task)

^aPHQ-9: Patient Health Questionnaire-9.

^bCBT: cognitive behavioral therapy.

^cSMART: Specific, Measurable, Achievable, Relevant, and Time-Bound.