Assessing the Effects of Behavioral Circadian Rhythm Disruption in Shift-Working Police Academy Trainees

Night shift work, characterized by behavioral circadian disruption, increases cardiometabolic disease risk. Our long-term goal is to develop a novel methodology to quantify behavioral circadian disruption in field-based settings and to explore relations to four metabolic salivary biomarkers of circadian rhythm. This pilot study enrolled 36 police academy trainees to test the feasibility of using wearable activity trackers to assess changes in behavioral patterns. Using a two-group observational study design, participants completed in-class training during dayshift for six weeks followed by either dayshift or nightshift field-training for six weeks. We developed a novel data-post processing step that improves sleep detection accuracy of sleep episodes that occur during daytime. We next assessed changes to resting heart rate (RHR) and sleep regularity index (SRI) during dayshift versus nightshift field training. Secondarily, we examined changes in field-based assessments of salivary cortisol, uric acid, testosterone, and melatonin during dayshift versus nightshift. Compared to dayshift, nightshift workers experienced larger changes to resting heart rate, sleep regularity index (indicating reduced sleep regularity), and alternations to sleep/wake activity patterns accompanied by blunted salivary cortisol. Salivary uric acid, testosterone, and melatonin did not change. These findings show that nightshift work-a form of behavioral circadian rhythm disruption-was detectable in police trainees using activity trackers alone and in combination with a specialized data analysis methodology.

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Polar Vantage and Oura physical activity and sleep trackers: A validation and comparison study (Preprint)

10.2196/preprints.27248 ◽

2021 ◽

Author(s):

André Henriksen ◽

Frode Svartdal ◽

Sameline Grimsgaard ◽

Gunnar Hartvigsen ◽

Laila Hopstock

Keyword(s):

Physical Activity ◽

Heart Rate ◽

Energy Expenditure ◽

Total Energy ◽

Sleep Duration ◽

Vigorous Physical Activity ◽

Total Energy Expenditure ◽

Sleep Diary ◽

Resting Heart Rate ◽

Activity Trackers

BACKGROUND Consumer-based activity trackers are increasingly used in research as they have potential to increase activity participation and can be used for estimating physical activity. However, the accuracy of newer consumer-based devices is mostly unknown, and validation studies are needed. OBJECTIVE The objective of this study was to test the accuracy of the Polar Vantage watch and Oura ring activity trackers for measuring physical activity, total energy expenditure, resting heart rate, and sleep duration, in free-living adults. METHODS Twenty-one participants wore two consumer-based activity trackers (Polar, Oura), an ActiGraph accelerometer, an Actiheart accelerometer and heart rate monitor, and completed a sleep diary for up to seven days. We assessed Polar and Oura validity and comparability for physical activity, total energy expenditure, resting heart rate (Oura), and sleep duration. We analysed repeated measures correlation, Bland-Altman plots, and mean absolute percentage error. RESULTS Polar and Oura were both strongly correlated (p<0.001) with ActiGraph for steps (Polar r 0.75, 95% CI 0.54-0.92. Oura r 0.77, 95% CI 0.62-0.87), moderate-to-vigorous physical activity (Polar r 0.76, 95% CI 0.62-0.88. Oura r 0.70, 95% CI 0.49-0.82), and total energy expenditure (Polar r 0.69, 95% CI 0.48-0.88. Oura r 0.70, 95% CI 0.51-0.83) and strongly or very strongly correlated (p<0.001) with the sleep diary for sleep duration (Polar r 0.74, 95% CI 0.56-0.88. Oura r 0.82, 95% CI 0.68-0.91). Oura had a very strong correlation (p<0.001) with Actiheart for resting heart rate (r 0.9, 95% CI 0.85-0.96). However, all confidence interval ranges were wide and mean absolute percentage error was high for all variables, except Oura sleep duration (10%) and resting heart rate (3%) where Oura under-reported on average one beat per minute. CONCLUSIONS Oura can potentially be used as an alternative to Actiheart to measure resting heart rate. For sleep duration, Polar and Oura can potentially be used as a replacement for a manual sleep diary, depending on acceptable error. Neither Polar nor Oura can replace ActiGraph for measuring steps, moderate-to-vigorous physical activity, and total energy expenditure, but may be used as an additional source of physical activity in some settings.

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Clinical Usefulness of Serum Uric Acid and Resting Heart Rate in the Diagnosis of Metabolic Syndrome in Korean Adults

Biomedical Science Letters ◽

10.15616/bsl.2017.23.2.118 ◽

2017 ◽

Vol 23 (2) ◽

pp. 118-127 ◽

Cited By ~ 3

Author(s):

Kyung-A Shin

Keyword(s):

Metabolic Syndrome ◽

Heart Rate ◽

Uric Acid ◽

Serum Uric Acid ◽

Clinical Usefulness ◽

Resting Heart Rate ◽

Korean Adults

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Circadian Rhythm of Heart Rate Assessed by Wearable Devices Tends to Correlate with the Circadian Rhythm of Salivary Cortisol Concentration in Healthy Young Adults

Chronobiology in Medicine ◽

10.33069/cim.2020.0022 ◽

2020 ◽

Vol 2 (3) ◽

pp. 109-114

Author(s):

Seunghwa Jeong ◽

Ju Yeon Seo ◽

Sehyun Jeon ◽

Chul-Hyun Cho ◽

Ji Won Yeom ◽

...

Keyword(s):

Heart Rate ◽

Young Adults ◽

Circadian Rhythm ◽

Salivary Cortisol ◽

Wearable Devices ◽

Cortisol Concentration

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Relationship between serum uric acid, metabolic syndrome and resting heart rate in Chinese elderly

Obesity Research & Clinical Practice ◽

10.1016/j.orcp.2015.04.007 ◽

2016 ◽

Vol 10 (2) ◽

pp. 159-168 ◽

Cited By ~ 1

Author(s):

Ping Liu ◽

Yunqi Jiang ◽

Juan Meng

Keyword(s):

Metabolic Syndrome ◽

Heart Rate ◽

Uric Acid ◽

Serum Uric Acid ◽

Resting Heart Rate ◽

Chinese Elderly

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A computationally efficient algorithm to obtain an accurate and interpretable model of the effect of circadian rhythm on resting heart rate

Physiological Measurement ◽

10.1088/1361-6579/ab3dea ◽

2019 ◽

Vol 40 (9) ◽

pp. 095001 ◽

Cited By ~ 1

Author(s):

Davide Morelli ◽

Leonardo Bartoloni ◽

Alessio Rossi ◽

David A Clifton

Keyword(s):

Heart Rate ◽

Circadian Rhythm ◽

Efficient Algorithm ◽

Resting Heart Rate ◽

Computationally Efficient ◽

Interpretable Model

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Regional Frontal Lobe Response Magnitudes During Affective Shifting Covary With Resting Heart Rate Variability in Healthy Volunteers

Journal of Psychophysiology ◽

10.1027/0269-8803/a000166 ◽

2016 ◽

Vol 30 (4) ◽

pp. 165-174 ◽

Cited By ~ 3

Author(s):

Ryan Smith ◽

John J.B. Allen ◽

Julian F. Thayer ◽

Richard D. Lane

Keyword(s):

Heart Rate ◽

Heart Rate Variability ◽

Healthy Subjects ◽

Emotional Reactivity ◽

Bold Signal ◽

Resting Heart Rate ◽

Functional Magnetic Resonance ◽

Absolute Value ◽

Cardiac Vagal Control ◽

Resting Heart Rate Variability

Abstract. We hypothesized that in healthy subjects differences in resting heart rate variability (rHRV) would be associated with differences in emotional reactivity within the medial visceromotor network (MVN). We also probed whether this MVN-rHRV relationship was diminished in depression. Eleven healthy adults and nine depressed subjects performed the emotional counting stroop task in alternating blocks of emotion and neutral words during functional magnetic resonance imaging (fMRI). The correlation between rHRV outside the scanner and BOLD signal reactivity (absolute value of change between adjacent blocks in the BOLD signal) was examined in specific MVN regions. Significant negative correlations were observed between rHRV and average BOLD shift magnitude (BSM) in several MVN regions in healthy subjects but not depressed subjects. This preliminary report provides novel evidence relating emotional reactivity in MVN regions to rHRV. It also provides preliminary suggestive evidence that depression may involve reduced interaction between the MVN and cardiac vagal control.

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