https://www.theguardian.com/technology/2018/jun/01/cancer-fitbit-treatment-chemotherapy

Researchers say wearable fitness trackers could also allow doctors to step in before patients must be sent to hospital

Wearable fitness trackers, such as the popular Fitbit, have the potential to help doctors predict which patients will do well on a course of chemotherapy, and be able to intervene before unexpected admissions to the hospital, experts believe.