Table 1 A summary of the wearable health monitor devices deployed in this study
Feature | Wearable Vital Signs Sensor | |||
|---|---|---|---|---|
HR/RR Isansys Lifetouch Sensor [16] | Temperature Isansys Lifetemp Sensor [16] | SpO2 Nonin3150 WristOx [17] | BP A&D TM2441 BP Monitor [18] | |
Form Factor | A small patch attached via standard ECG electrodes | A small adhesive patch | Wrist-worn module, pulse oximetry finger probe | Cuff with attached servo unit. |
CE marked medical device | Yes | Yes | Yes | Yes |
Wear Location | Precordium | Axilla | Wrist and fingertip | Arm |
Method of measurement | HR by single lead ECG. RR derived from HRV using proprietary algorithm. | Thermistor used to determine skin temperature. | SpO2 determined from differential absorption spectroscopy. | Automated, oscillometric measurement of blood pressure by sensing cuff. |
Frequency of vital sign measurement | Every minute | Every minute | Every minute | Hourly (6am-10Â pm), every two hours (10Â pm-6am) |
Battery Life | 72 h | 5 days | 48 h. 2x AAA batteries. | 48 h. 2x AA batteries. |
Single Use? | Yes (device replaced when battery low) | Yes (device replaced when battery low) | No | No |
Data Synchronisation | BLE to Samsung Galaxy Tablet. Subsequent data upload via WiFi/cellular from tablet to remote server (Isansys LifeGuard Server) | |||
Software Used | Isansys PSE software | |||
Metrics recorded | Accelerometer (activity and posture), ECG (single lead), HR, HRV, RR. | Temperature (skin—axilla) | HR (pleth) SpO2 (finger) | Non-invasive BP |