TUG (short for Timed-Up-and-Go), is a simple baseline test to determine a patient's mobility. In this test, a patient rises from a chair, walks three meters, turns around, walks back to the chair, and sits down. The test is scored by the amount of time this process takes. A video demonstration can be found


sTUG aims to provide additional data by using the sensors in readily available Android smartphones instead of an independent sensor array. This makes the smartphone ideal for a lightweight, inexpensive, and accessible way to gauge a patient's mobility. And more importantly, this test can be administered by anyone, anywhere.

Data Organization

This data is organized in the EDF format. More information on EDF can be found here. A link to EDFbrowser, a free application to view and edit EDF files, can be found here.

The sTUG application records data from the accelerometer, gyroscope, and magnetometer sensors from the Android smartphone. In addition, the Android OS's digital orientation calculation is recorded. Using these, the following signals are recorded:

  • accelerometer x
  • accelerometer y
  • accelerometer z
  • gyroscope x
  • gyroscope y
  • gyroscope z
  • magnetometer x
  • magnetometer y
  • magnetometer z
  • pitch orient x
  • roll orient y
  • azimuth orient z

The manufacturer and accuracy of each sensor is located in the header record of the relevant EDF file.



Date Time File
5 Jan 2014 15:57:20 stug_01_05_2014__15_57_20.edf
5 Jan 2014 15:58:36 stug_01_05_2014__15_58_36.edf
5 Jan 2014 15:59:16 stug_01_05_2014__15_59_16.edf
5 Jan 2014 16:00:03 stug_01_05_2014__16_00_03.edf
5 Jan 2014 16:02:50 stug_01_05_2014__16_02_50.edf
5 Jan 2014 16:03:07 stug_01_05_2014__16_03_07.edf
5 Jan 2014 16:25:47 stug_01_05_2014__16_25_47.edf
5 Jan 2014 16:26:05 stug_01_05_2014__16_26_05.edf
5 Jan 2014 16:54:05 stug_01_05_2014__16_54_05.edf
5 Jan 2014 16:54:41 stug_01_05_2014__16_54_41.edf
5 Jan 2014 16:55:07 stug_01_05_2014__16_55_07.edf
5 Jan 2014 17:31:05 stug_01_05_2014__17_31_05.edf
5 Jan 2014 17:31:22 stug_01_05_2014__17_31_22.edf

Note: Right-click and select "Save link as..." to download.



EDF browser Homepage