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4.2 LM-Analysis (LM: Leg Movement)
The LM Analysis detects periodic leg movements during sleep and restless legs during daytime.
Periodic leg movements can be the reason for disturbed sleep and require further diagnosis. This
motor analysis can provide the diagnosis of Restless Legs together with clinical symptoms.
Figure 9. LM analysis settings.
1)
Analysis Window [s]
Time period used by the analysis to determine the baseline.
2)
Ratio Mag. [%]
This parameter is not used for the SOMNOtouch PLM analysis with the PLM Combi sensor.
3)
Ratio PLM [%]
This ratio refers to the percentage change in relation to the baseline. All values above this ratio will be
detected as a Leg Movement.
4)
Min. Duration [ms]
Minimum duration of a Leg Movement event.
5)
Max. Duration [ms]
Maximum duration of a Leg Movement event.
6)
Connection time [ms]
Two PLM events during a short interval will be marked as one if they are chronologically separated by
a value smaller than the given connection time.
7)
Min. Signal
The mean activity is calculated during a detected LM. If this value equals or exceeds the value
‘
Min.
Signal
’
,
a LM will be scored.
8)
Compensation Act. [%]
This parameter is not used for the SOMNOtouch PLM analysis with the PLM Combi sensor.
9)
Synchronisation [ms]
Maximum chronological separation of events in both Leg Movement channels (PLM l, PLM r) for a
simultaneous movement to be detected.
10)
Min. Distance [s]
Minimum chronological separation of two Leg Movements for a PLM event to be detected.