ActiGraph ACTITRAINER Uživatelský manuál stáhnout pdf (Strana 76)

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Cole-Kripke Algorithm

The Cole-Kripke algorithm is considered appropriate for use with adult populations because it was developed using

subjects ranging from 35 to 65 years of age. Roger J. Cole and Daniel F. 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 data collected at10 second epoch periods.

The algorithm was adapted to the ActiGraph ActiSleep monitor by performing a side by side test using the AMI device

and the ActiSleep monitor worn together. The data were scaled then put through the algorithms until the ActiSleep

monitor sleep score matched that from the AMI device.

Sadeh Algorithm Summary

The Sadeh algorithm was developed by Dr. Avi Sadeh from Tel-Aviv University in Israel and is considered appropriate for

younger populations because it was developed using subjects ranging from 10 to 25 years of age. He used the same

device that Cole-Kripke used to develop their algorithm, and ActiGraph therefore adapted it in the same way by scaling

our data until it matched up with the scoring results of the AMI device. In general terms, this algorithm determines a

subject’s sleep state by examining the ActiGraph activity over an 11 minute sliding window. For any given window, a

“Sleep Score” (whether the person is asleep or not) can be determined by applying this formula. After selecting a sleep

time (Time In Bed (TIB) and Time Out of Bed (TOB)) each minute of sleep data is analyzed this way.

Sleep Score Information

Both algorithms will yield the following information within ActiLife’s Sleep Scoring tool for each sleep period. Sleep

period scores can be seen by clicking on the sleep period of interest on the right-hand side of the screen (see Figure 46

for an illustration).

Sleep Onset - The first minute that the Sadeh scores “asleep.”

Total Sleep Time (TST) – The total number of minutes scored as “asleep.”

Wake after Sleep Onset (WASO) – The total number of minutes the subject was awake after sleep onset occurred.

Awakenings - The number of different awakening episodes as scored by the algorithm. This is sometimes referred to as

Frequency of Awakenings (shown as the number of awakenings per night).

Avg Awakening – The average length, in minutes, of all awakening episodes.

Total Counts – The total actigraphy counts summed together for the entire sleep period.

Efficiency –Defined as the proportion of sleep in the episode potentially filled by sleep (i.e., the ratio of total sleep time

to time in bed) or Sleep Efficiency = Total sleep time multiplied by time in bed. (JSD); Normal sleep efficiency is at least

85% (asleep 85% of the night). It is reduced in a number of situations, such as insomnia or simply lab effect.

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ActiGraph ACTITRAINER Uživatelský manuál Strana 76