Video analysis of gross body movements during sleep.
Gross body movements (GM) during sleep, classified into four GM types by the involved parts of body, were evaluated using two-dimensional video analysis in five normal children aged 4-12 years. The rate of occurrence of all GM types showed apparent sleep stage dependency. Among four GM types, GM-1 (GM with axial rotation) was the most frequent. Averaged duration of GM-1 was the longest. A total of 77.2% of GM-1 started with the contraction of chin muscle and 35% of total sleep changes (tSC) were related to GM. A total of 5.6% of tSC following GM shifted to the deeper stage. Further evaluation is necessary in order to understand the physiological mechanism of GM.
Shimohira
M
M
Department of Pediatrics, Faculty of Medicine, Tokyo Medical and Dental University, Japan.
Shiiki
T
T
Sugimoto
J
J
Ohsawa
Y
Y
Fukumizu
M
M
Hasegawa
T
T
Iwakawa
Y
Y
Nomura
Y
Y
Segawa
M
M
D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008297:Male; D009043:Motor Activity; D017286:Polysomnography / Q000295:instrumentation*; D012016:Reference Values; D012680:Sensitivity and Specificity; D012894:Sleep Stages; D014741:Video Recording / Q000295:instrumentation*