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45‐Hour continuous quintuple‐site actimetry: Relations between trunk and limb movements and effects of circadian sleep‐wake rhythmicity
Author(s) -
MIDDELKOOP HUUB A. M.,
DAM ELLEN M.,
SMILDEVAN DEN DOEL DINI A.,
DIJK GERT
Publication year - 1997
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.1997.tb02132.x
Subject(s) - wrist , circadian rhythm , trunk , psychology , physical medicine and rehabilitation , motor activity , sleep (system call) , ankle , activity monitor , nocturnal , medicine , physical activity , neuroscience , anatomy , biology , ecology , computer science , operating system
Diurnal and nocturnal trunk and limb motor activity of 20 healthy individuals was evaluated by actimetry for 45 consecutive hours. Sleep was assessed by sleep logs. Overall, motor activity significantly (p < .05) decreased in the order wrist, ankle, and trunk. There was significantly more motor activity in the dominant wrist during the diurnal period. Motor activity was significantly affected by the 24‐hr sleep‐wake cycle, with lower levels and prolonged immobility during the night. Time series analyses revealed different but significant correlations between motor activity at all sites. These data imply that (a) motor activity should be recorded at the dominant wrist when the highest level of motor activity is of importance, (b) recordings at the nondominant wrist are better indicators of trunk movement than are dominant wrist recordings, and (c) sites other than the conventional nondominant wrist recording site should be evaluated to improve the validity of motor activity‐based sleep‐wake scoring.