In Reply We are pleased that Lee et al are interested in our study that used ecologic momentary assessment to monitor youths following concussion.1 We monitored physical activity using the Actigraph gt3x+, which Lee et al2 found to perform well in their study of the accuracy of several activity monitors. We will be reporting on additional protocol details and participant compliance and epidemiologic findings in future articles, whereas the goal in our brief report was to communicate primarily that ecologic momentary assessment provided a feasible method to prospectively monitor patients with concussion as participants in the context of youth concussion. Certainly, as we mentioned in our article, future studies that aim to understand how youths recover from concussion should consider measuring physical activity in a range of ways, activity intensity being one of them. In fact, the Actigraph gt3x+ data enable a measure of activity intensity that we are studying. Testing for effect modification by age group, sex, and other characteristics will also be important in future studies.
Wiebe DJ, Nance ML, Master CL. Measuring Postconcussive Activity Levels of Patients—Reply. JAMA Pediatr. 2017;171(5):494. doi:10.1001/jamapediatrics.2017.0121
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