Sleep Parameters Collected From Actigraphy Actigraph devices collect information including total sleep time, sleep onset latency, wakefulness after sleep onset, nocturnal awakenings, and sleep efficiency (Ancoli-Israel et al., 2015). Actigraph devices collect information including total sleep time, sleep onset latencysleep onset latencySleep onset latency is the duration of time from turning the light off to falling asleep as determined by PSG. Usually, sleep latency is <20 min. The evidence for sleep latency differences with age is weak, and study results are inconsistent.https://www.sciencedirect.com › topics › sleep-onset-latencySleep Onset Latency - an overview | ScienceDirect Topics, wakefulness after sleep onset, nocturnal awakenings, and sleep efficiency (Ancoli-Israel et al., 2015).
How do you wear an ActiGraph?
You should wear the Actigraph on your non-dominant wrist (i.e. if you are right handed please wear the Actigraph on your left wrist).
What is an ActiGraph sensor?
An actigraph monitors movement and can be used to assess sleep-wake cycles, or circadian rhythms, over an extended period of time. It uses something called an accelerometer to record motion. These are often integrated into smartphones and can also be separate devices. Actigraphs may be worn for weeks or even months.
How accurate is actigraphy?
Conclusions: This validation quantifies strengths and weaknesses of actigraphy as a tool measuring sleep in clinical and population studies. Overall, the participant-specific accuracy is relatively high, and for most participants, above 80%.
How does an actigraphy work?
An actigraph monitors movement and can be used to assess sleep-wake cycles, or circadian rhythms, over an extended period of time. It uses something called an accelerometer to record motion. These are often integrated into smartphones and can also be separate devices. This information is then used to create a graph.
What types of assessments are done with actigraphy?
In the clinical setting, actigraphy has been used to evaluate sleep patterns in patients with insomnia, for diagnosis of circadian rhythm disorders (including shift work), and in evaluating sleep in individuals who are less likely to tolerate polysomnography (PSG), such as infants and demented elderly.
Is actigraphy more accurate than polysomnography?
The only significant difference found between actigraphy and PSG was in latency to persistent sleep, in which actigraphy underestimated sleep latency relative to PSG (p<0.05). In contrast, significant differences were observed between sleep diaries and PSG for all sleep variables.The only significant difference found between actigraphy and PSG was in latency to persistent sleep, in which actigraphy underestimated sleep latency relative to PSG (p<0.05). In contrast, significant differences were observed between sleep diariessleep diariesA sleep diary is a record of an individual's sleeping and waking times with related information, usually over a period of several weeks. It is self-reported or can be recorded by a care-giver. The sleep diary, or sleep log, is a tool used by doctors and patients.https://en.wikipedia.org › wiki › Sleep_diarySleep diary - Wikipedia and PSG for all sleep variables.
Are there any limitations to using actigraphy?
Key Limitations of Wrist Actigraphy Although actigraphy is an objective measure of sleep vs wakefulness, it has not been validated for measuring sleep stages. Actigraphy is also prone to overestimating sleep in certain patient groups.
What is an advantage of actigraphy over polysomnography?
One advantage of actigraphy methods over polysomnography methods is about duration. Recording is longer than laboratory settings, duration of collection of data may be adapted to each patient and highlight informations that cannot be found through one-night measurement such as sleep habits.
What can actigraphy measure?
Actigraphy. An actigraph is a wristwatch-sized instrument usually worn on the non-dominant hand or ankle that measures movement over time and uses this as an indirect measure of sleep and wakefulness.
What does an actiwatch measure?
The Actiwatch-2 utilizes a piezoelectric sensor to detect vertical accelerations at the wrist between 0.5 and 2.0g with a frequency response range between 0.35-7.5Hz. Activity counts from the device reflect the peak acceleration detected over each epoch and are used in determining sleep and wake intervals.