What is Cole Kripke algorithm?

What is Cole Kripke algorithm?

Cole-Kripke algorithm Kripke adapted a scoring method developed by J. B. Webster with an experimental wrist Actigraph for the AMI Actigraph in 1992. It was developed using 10, 30 and 60 epochs, with the highest level of accuracy resulting from the 10 second epoch.

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 is an actigraphy study?

Actigraphy is a validated method of objectively measuring sleep parameters and average motor activity over a period of days to weeks using a noninvasive accelerometer [1-6]. The accelerometer is housed in a small device that is worn like a wristwatch.

What is an actigraphy device?

What is an actigraphy device? An actigraph, also referred to as an actometer or actimeter, is a wrist-worn activity monitor that is used to monitor movement and sleeping/waking patterns over an extended time period.

Is actigraphy accurate?

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 long does ActiGraph battery last?

five (5) years
All ActiGraph devices use a lithium polymer rechargeable battery that has a maximum voltage of approximately 4.20 volts and have a total life expectancy of five (5) years. Even though these batteries are replaceable, only ActiGraph personnel are to replace the batteries.

How much is an ActiGraph?

around $250
The NAPL reports there is no cost to use their ActiGraphs. However, the cost to purchase an ActiGraph is around $250. Researchers may need to plan to include replacement costs as the monitors may be broken with use.

What is the difference between an actigraph and an algorithm?

An actigraph, or algorithm, that incorrectly scores sleep as wake has low sensitivity, and an actigraph, or algorithm, that incorrectly scores wake as sleep has low specificity.

What is actigraphy and how is it used?

Actigraphy is an objective measurement method that assesses limb movement activity via a small recording device typically worn on the wrist (see Chapter 147). Recorded data are subjected to a proprietary algorithm that produces estimates of sleep–wake variables.

How well do actigraphy-based algorithms classify sleep epochs?

In healthy subjects, existing actigraphy-based algorithms reach more than an 85 % epoch-wise scoring agreement rate to PSG, correctly classifying more than 95% of sleep epochs (sensitivity) while correctly classifying between 60% ( Cole et al., 1992) and 74% ( Sadeh et al., 1994) of wake epochs (specificity).

How accurate is actigraphy in interpreting data?

Actigraphy is fairly accurate at interpreting some measures, but not as accurate at interpreting others. For example, if you lay still in bed for an hour trying to fall asleep, the actigraphy might interpret that period as sleep.