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Long-term Monitoring of Movements in Bed and Their Relation to Subjective Sleep Quality
Jukka Kaartinen Ph.D, Ilpo Kuhlman M.A, Pekka Peura M.A
The development of sensitive movement detectors has stimulated interest in nocturnal
motility. As no first night effect (FNE) has been found in motor activity, single-night
recordings have sometimes been suggested sufficient as an objective measure of sleep
quality. The aim of the present study was to investigate the stability of movement based
activities over a two week period. The body motility, respiratory movements, and
ballistocardiogram of 16 healthy subjects were registered using the static charge sensitive
bed (SCSB) across 14 consecutive nights at their homes. The automatically analyzed SCSB
data were also compared to the nightly variations in subjective sleep quality. No major
systematic tendencies were found in motility during the registering period, but a subjective
FNE was obvious. There was great inter-subject variation in motor activity, but noteworthy
intra-subject differences were also found. The correlations between subjective and objective
measures across the 14 nights quite systematically indicated better subjective sleep quality
as a function of low motility. A more systematic relation was revealed when the subjective
evaluations of the nights representing the extremes of motor activity were compared with
each other, increased activity indicating subjectively distorted sleep. Both the great interindividual
differences in motility and the unsystematic but remarkable variation within
subjects suggest that, at least as regards small samples of subjects, very much cannot be
inferred from single-night movement recordings. Consequently, if motility is intended to be
used as an indicator of sleep quality more than one recording night is often advisable in
order know the individual motor baseline. (Sleep and Hypnosis 2003;5(3):145-153)
Key words: body movements, SCSB activity analysis, inter- and intra-individual
variation, subjective sleep quality
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