Going Out of Bed
If the subject leaves the bed for a short while between going into bed in the evening and getting up in the morning, this is called an ‘out of bed period’. The total amount of ‘out of bed periods’ and the beginning and the end of each period are displayed.
Night's Rest Detection
The MoveMonitor activity classification is used to identify the night’s rest. This yields information about the time of going into bed in the evening and getting up in the morning. Any period of lying that lasts longer than 3 hours, which is interrupted for less than 15 minutes, will be detected as night’s rest.
The inclination of the trunk is used to trace the subjects’ postures. The postures ‘left side’, ‘right side’, ‘prone’, and ‘supine’ are detected and are shown in a graph. Besides this, the absolute and relative duration of each posture are displayed.
By calculating the size of the rotation vector of the DynaPort every movement is detected. Movement Time indicates the percentage of time that movement is detected. Movement Time per minute is also shown in a graph.
The size of the rotation vector is used to calculate the intensity of all movement periods. The average Movement Intensity per minute is shown in a graph. The average Movement Intensity of all movement periods is displayed.
Each rotation of more than 10 degrees is called a transition. Each transition is classified in one of four classes: small shifts, medium shifts, large shifts, and extra large shifts. For every class the frequency, average velocity, and average duration are shown.
1. Langer, D., Gosselink, R., Sena, R., Burtin, C., Decramer, M., & Troosters, T. (2009). Validation of Two Activity Monitors in Patients With COPD. Thorax, 64, 641-642. doi:10.1136/thx.2008.112102.
2. van Hees, V. T., Slootmaker, S. M., de Groot, G., Van Mechelen, W., & van Lummel, R. C. (2009). Reproducibility of a Triaxial Seismic Accelerometer (DynaPort). Medicine & Science in Sports & Exercise, 41(4), 810-817. doi:10.1249/MSS.0b013e31818ff636.