II. Indications
III. Definitions
- Actigraphy
- Accelerometer monitors patients overnight movement
- Calculates actual patient sleep time
- Calculates limb movements over time
IV. Technique
- Patient wears a sensor on their wrist or ankle overnight for days to weeks
- Device measures frequency and degree of limb movements over time
V. Interpretation
- Sleep Phases
- Sleep Duration
- Sleep Patterns
- Sleep Latency (Sleep Onset Latency)
- Time for a person to fall asleep after intending to sleep (e.g. lying down, lights off)
- Normally 10-20 minutes
- Sleep Efficiency
- Key metric in Cognitive Behavioral Therapy for Insomnia
- Normally >80%
- Sleep Efficiency = (100 * TST / TIB)
- Where TST is total sleep time
- Where TIB is time in bed
VI. References
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Related Studies
| Concepts | Finding (T033) |
| English | Sleep efficiency (ratio of sleep time / total time trying) |
Ontology: Actigraphy (C1171301)
| Definition (MSH) | The measurement and recording of MOTOR ACTIVITY to assess rest/activity cycles. |
| Definition (CSP) | measurement of physical activity; can attach device to body to record activity (actigraph watch). |
| Concepts | Diagnostic Procedure (T060) |
| MSH | D056044 |
| English | actigraphy, actigraphy (procedure), Actigraphy |
| French | Actigraphie, Actimétrie |
| German | Aktigrafie, Aktigraphie |
| Italian | Attigrafia |
| Portuguese | Actigrafia |
| Spanish | Actigrafía |
| Russian | AKTIGRAFIIA, АКТИГРАФИЯ |
| Czech | aktigrafie |
| Swedish | Aktigrafi |
| Polish | Aktografia |
| Norwegian | Aktigrafi |
