Table 1.

Functionality and key characteristics of the mobile app.

Functionality	Key characteristics (evidence-based)
Expert consultation	Provides consultations related to exercise and nutrition using text messages, voice recordings, and images; health care professionals respond to the questions within 24 hours.
Self-monitoring (today’s to-do list)	Allows users to self-check their treatment-related symptoms; allows users to self-assess their physical activity, calorie consumption, sleep, and stress information.
Personalized health information and education	Offers health information and education on exercise, nutrition, and disease (updated every Monday in webzine form); offers health information and education according to surgery, treatment type, side effects, and comorbidities.
Personalized exercise management	Offers aerobic exercise with the goal of a specific heart rate and exercise time according to the user’s health information; offers an arm and shoulder exercise program with a video consisting of four steps according to the user’s information (surgery and treatment type) and exercise journal.
Physical activity management	Recommends target step intensity (normal, brisk, and run), calories, heart rate, and step count (eg, 5000 steps and 200 kcal).
Diet management	Provides daily guidelines for each food group: Users can record the foods ingested during breakfast, lunch, dinner, and refreshments for a day using speech recognition and text input; recommends nutritional intake according to comorbidities.
Sleep management	Allows users to track total sleep times, sleep efficacy, REMa sleep time, NREMb sleep time, and sleep quality using a smart band.
Comorbidity management (weight, blood pressure, blood glucose)	Allows users to use a journal format and Bluetooth-enabled smart device: The target blood pressure and blood glucose levels are indicated; allows users to track their weight, blood pressure, and blood glucose level.
Stress management	Allows users to track their stress level (categorized as good, normal, low, and high) based on heart rate variation analysis.
Medication and smoking management	Provides an alarm sound at the time when users should take their medications, allowing them to track their medication intakes; provides an alarm sound to prompt users to record their daily smoking status.

^aREM: rapid eye movement.

^bNREM: non-rapid eye movement.