TY - JOUR
T1 - Measure of sleep and physical activity by a single accelerator
T2 - Can a waist-worn Actigraph adequately measure sleep in children?
AU - Hjorth, Mads Fiil
AU - Chaput, Jean-Philippe
AU - Damsgaard, Camilla Trab
AU - Dalskov, Stine-Mathilde
AU - Michaelsen, Kim F.
AU - Tetens, Inge
AU - Sjödin, Anders Mikael
N1 - IHE 2012 046
PY - 2012
Y1 - 2012
N2 - Accelerometers could potentially be used to assess physical activity and sleep using the same monitor; however, two different positions are typically used for the assessment of physical activity and sleep (waist and wrist, respectively). The aim of this study is to evaluate the concordance between wrist- and waist-worn Actigraphs for sleep scoring using existing algorithms developed for placement on the wrist. Sixty-two Danish children aged 10.3 ± 0.6 years (mean ± standard deviation) wore an accelerometer (Actigraph GT3X+ Tri-Axis Accelerometer Monitor) on the right hip and on the non-dominant wrist for a continuous 7 days and 8 nights. The minute-by-minute sleep–wake agreement was evaluated and the concordance among sleep indicators was assessed using one-way ANOVA, Bland–Altman plots and Pearson correlations. The sensitivity, specificity and accuracy were 98.8–99.7, 29.8–46.9 and 86.6–88.9%, respectively. Total sleep time and sleep efficiency were higher when assessed from the waist compared to the wrist measurement site (73.8 min, P < 0.001; 12.6%, P < 0.001, respectively). In conclusion, the waist-worn and wrist-worn Actigraph monitors cannot be used interchangeably for the measurement of sleep indicators in children using the present algorithms. However, the waist-worn Actigraph monitor can provide a proxy measure of total sleep time for ranking purposes in epidemiologic studies.
AB - Accelerometers could potentially be used to assess physical activity and sleep using the same monitor; however, two different positions are typically used for the assessment of physical activity and sleep (waist and wrist, respectively). The aim of this study is to evaluate the concordance between wrist- and waist-worn Actigraphs for sleep scoring using existing algorithms developed for placement on the wrist. Sixty-two Danish children aged 10.3 ± 0.6 years (mean ± standard deviation) wore an accelerometer (Actigraph GT3X+ Tri-Axis Accelerometer Monitor) on the right hip and on the non-dominant wrist for a continuous 7 days and 8 nights. The minute-by-minute sleep–wake agreement was evaluated and the concordance among sleep indicators was assessed using one-way ANOVA, Bland–Altman plots and Pearson correlations. The sensitivity, specificity and accuracy were 98.8–99.7, 29.8–46.9 and 86.6–88.9%, respectively. Total sleep time and sleep efficiency were higher when assessed from the waist compared to the wrist measurement site (73.8 min, P < 0.001; 12.6%, P < 0.001, respectively). In conclusion, the waist-worn and wrist-worn Actigraph monitors cannot be used interchangeably for the measurement of sleep indicators in children using the present algorithms. However, the waist-worn Actigraph monitor can provide a proxy measure of total sleep time for ranking purposes in epidemiologic studies.
U2 - 10.1111/j.1479-8425.2012.00578.x
DO - 10.1111/j.1479-8425.2012.00578.x
M3 - Journal article
VL - 10
SP - 328
EP - 335
JO - Sleep and Biological Rhythm
JF - Sleep and Biological Rhythm
SN - 1446-9235
IS - 4
ER -