The purpose of this research is to learn more about how what the Apple watch measures, in terms of walking data, heart rate, breathing rate, and sleep habits, relates to how participants feel. During the course of the treatment, the symptoms participants experience change, and whether the Apple watch can detect these changes. Ultimately, this knowledge is being used to design proactive tools and signatures that can predict complications or symptom changes before they happen.
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Inclusion Criteria: * newly-diagnosed or recurrent glioblastoma undergoing treatment or active surveillance * at least 18 years of age at the time of study enrolment * Karnofsky Performance Status (KPS) ≥ 70% at time of study enrolment * able to comprehend informed consent form and provide informed consent * access to patient or caregiver's own Apple iPhone to interface with watch application for documentation of symptoms Exclusion Criteria: * under 18 years of age at the time of study enrolment * inability to give informed consent due to aphasia or other language barrier * tattoos located on the skin of the wrist or forearm where the Apple Watch will be placed or other skin conditions preventing adequate sensor function * inability to tolerate Apple Watch for at least 12 hours per day on at least 50% of days in a four-week period * no access to patient or caregiver Apple iPhone to document symptoms