45‐Hour continuous quintuple‐site actimetry: Relations between trunk and limb movements and effects of circadian sleep‐wake rhythmicity

Middelkoop, Huub A. M.; Dam, E. M. Van; Doel, D. A. Smilde-Van Den; Dijk, Gerrit van

doi:10.1111/j.1469-8986.1997.tb02132.x

Cited by 86 publications

(65 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…One explanation might be the different placement of the actigraph (chest instead of wrist) for sensor integration reasons. Studies on different actigraph placements reported differences in actigraphy performance, which supports this hypothesis [18], [19]. Architecture A1 (diamond), which is using ECG and respiration signals is clearly better than A5 in detecting sleep and wake states.…”

Section: Resultssupporting

confidence: 56%

Improving actigraph sleep/wake classification with cardio-respiratory signals

Karlen

Mattiussi

Floreano

2008

2008 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

View full text Add to dashboard Cite

Abstract-Actigraphy for long-term sleep/wake monitoring fails to correctly classify situations where the subject displays low activity, but is awake. In this paper we propose a new algorithm which uses both accelerometer and cardiorespiratory signals to overcome this restriction. Acceleration, electrocardiogram and respiratory effort were measured with an integrated wearable recording system worn on the chest by three healthy male subjects during normal daily activities. For signal processing a Fast Fourier Transformation and as classifier a feed-forward Artificial Neural Network was used. The best classifier achieved an accuracy of 96.14%, a sensitivity of 94.65% and a specificity of 98.19%. The algorithm is suitable for integration into a wearable device for long-term home monitoring.

show abstract

Section: Resultssupporting

confidence: 56%

Improving actigraph sleep/wake classification with cardio-respiratory signals

Karlen

Mattiussi

Floreano

2008

2008 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

View full text Add to dashboard Cite

show abstract

“…This site was chosen because the results of previous research have shown that motor activity measured at the dominant wrist is the most appropriate 22 and also correlates best with general physical activity. 23 The internal clock of the ambulatory BP monitor was set on the same computer.…”

Section: Measurementsmentioning

confidence: 99%

Reactivity of Ambulatory Blood Pressure to Physical Activity Varies With Time of Day

et al. 2006

View full text Add to dashboard Cite

Abstract-Blood pressure (BP) fluctuates over a 24-hour period, but it is unclear to what extent this variation is governed completely by changes in physical activity. Our aim was to use a BP "reactivity index" to investigate whether the BP response to a given level of physical activity changes during a normal sleep-wake cycle. Hypertensive patients (nϭ440) underwent simultaneous 24-hour ambulatory BP, heart rate (HR), and activity monitoring. BP and HR were measured every 20 minutes. Actigraphy data were averaged over the 15 minutes that preceded a BP measurement. Individual BP and HR reactivity indices were calculated using least-squares regression for twelve 2-hour periods. These indices were then analyzed for time-of-day differences using a general linear model. Systolic BP and HR were generally more reactive to physical activity than diastolic BP. The highest reactivity of systolic BP (meanϮSEϭ4Ϯ1 mm Hg per logged unit change in activity) was observed between 8:00 AM and 10:00 AM (Pϭ0.014). Between 10:00 AM and 12:00 PM, BP reactivity then decreased (Pϭ0.048) and showed a secondary rise in the early afternoon. These 24-hour changes in BP reactivity did not differ significantly between groups formed on the basis of early and late wake times (Pϭ0.485), medication use, age, and sex (PϾ0.350). In conclusion, under conditions of normal living, the reactivity of BP and HR to a given unit change in activity is highest in the morning and shows a secondary rise in the afternoon.

show abstract

“…Actigraphs are usually worn around the wrist to assess sleep, and around the waist/ trunk to assess physical activity [10,33,34], and the validation of the present sleep-scoring algorithm was conducted based on wrist-worn actigraphs [11]. However, good agreements between sleep/wake identifications and estimations of total sleep duration by wrist and waist actigraphy are reported [10,[35][36][37]. Due to the lack of sleep diaries, we had to rely solely on the researchers' identification of sleep based on the selected criteria, which probably has caused misscoring of sleep in some cases.…”

mentioning

confidence: 94%

Effect of Different Doses of Exercise on Sleep Duration, Sleep Efficiency and Sleep Quality in Sedentary, Overweight Men

Nielsen¹

2013

Bioenergetics

View full text Add to dashboard Cite

Objective: To evaluate the dose-response effect of aerobic exercise on sleep duration, sleep efficiency and sleep quality in previously sedentary, moderately overweight men. Methods:In a randomized, controlled trial, 53 sedentary Caucasian men aged between 20 and 40 years (VO 2 -max<45 mL O 2 kg -1 min -1 , BMI: 25-30 kg/m 2 , body fat>25%) completed a 13-week aerobic exercise intervention consisting of either a physical activity energy deficit of 600 kcal day -1 (HIGH: n=18), 300 kcal day -1 (MOD: n=18), or being sedentary (CON: n=17). The endpoints were sleep duration (objectively measured by actigraphy over 3 days), sleep efficiency (3-day actigraphy), and subjectively rated sleep quality (Pittsburgh Sleep Quality Index). Results:Because of missing sleep data, a total of 32 subjects were included in the present analysis (CON: n=12, MOD: n=12, HIGH: n=8). A significant increase in sleep duration was observed in HIGH (80 ± 30 min, p=0.03). However, the change was not significantly different from the change in CON. Sleep efficiency tended to decrease in HIGH (p=0.05), and there was a tendency towards an improved sleep quality within MOD and HIGH (p=0.08 in both). Conclusion:Our study suggests that a high daily dose of aerobic exercise for 13 weeks increases sleep duration, tends to decrease sleep efficiency, and tends to improve subjective sleep quality in sedentary, moderately overweight men. Because our sample included relatively young and sleep-efficient individuals, future studies should examine the dose-response effects of aerobic exercise on sleep parameters in older adults with sleeping problems. Page 2 of 6 dose exercise (HIGH) (n=22). All subjects were tested pre-intervention, then randomized, and finally re-tested at the end of the intervention. A more extensive description of the study is provided elsewhere [7]. Subjects gave their informed written consent to participate in the study. The data presented here are part of a larger study on metabolic and cultural health in moderately overweight men (Project Four-IN-onE [FINE]; http://fine.ku.dk) and was approved by the ethics committee of the Capital Region of Denmark (H-4-2009-089) and adhered to the Helsinki Declaration. The study was also registered at http://www. clinicaltrials.gov with the identifying code NCT01430143. Exercise protocolSubjects were randomly assigned to CON, MOD or HIGH. Subjects in CON were instructed to maintain their sedentary lifestyle. Subjects in MOD and HIGH were instructed to perform daily aerobic exercise (running, cycling, rowing etc.) equivalent to an energy expenditure of 300 or 600 kcal day . All subjects were instructed not to impose any dietary restriction throughout the intervention, but to continue eating a selfselected ad libitum diet, unless otherwise stated [7]. Subjects in MOD and HIGH had free access to fitness centers. Missed sessions (unless due to injury or illness) were to be compensated for during the following sessions. Three times per week exercise intensity had to be >70% of VO 2 max based on th...

show abstract

45‐Hour continuous quintuple‐site actimetry: Relations between trunk and limb movements and effects of circadian sleep‐wake rhythmicity

Cited by 86 publications

References 11 publications

Improving actigraph sleep/wake classification with cardio-respiratory signals

Improving actigraph sleep/wake classification with cardio-respiratory signals

Reactivity of Ambulatory Blood Pressure to Physical Activity Varies With Time of Day

Effect of Different Doses of Exercise on Sleep Duration, Sleep Efficiency and Sleep Quality in Sedentary, Overweight Men

Contact Info

Product

Resources

About