Sleep and performance in simulated Navy watch schedules

Skornyakov, Elena; Shattuck, Nita Lewis; Winser, Michael A.; Matsangas, Panagiotis; Sparrow, Amy R.; Layton, Matthew E.; Gabehart, Rylie J.; Dongen, Hans P A Van

doi:10.1016/j.aap.2015.11.021

Cited by 11 publications

(6 citation statements)

References 25 publications

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“…Subjects were in the laboratory continuously for six days (five nights) with up to seven other subjects in the laboratory at the same time. Simulating around-the-clock Naval shift schedules (watch sections), subjects were assigned to one of four conditions as previously described27 ) :…”

Section: Methodsmentioning

confidence: 99%

“…During simulated watchstanding, subjects performed continuous, cognitively demanding computer tasks while seated at a desk, including tests on psychomotor vigilance, reaction time, perseveration, memory, response inhibition, and decision-making processes. In all four conditions, activity levels were recorded continuously using wrist actigraphy (Actiwatch-2; Respironics, Bend, OR, USA) to assess sleep/wake patterns (reported elsewhere)27 ) .…”

Section: Methodsmentioning

confidence: 99%

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Cardiac autonomic activity during simulated shift work

et al. 2019

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Shift work leads to adverse health outcomes including increased risk of cardiovascular disease. Heart rate (HR) and heart rate variability (HRV) are measures of cardiac autonomic activity and markers of cardiovascular disease and mortality. To investigate the effects of shift work on cardiac autonomic activity, we assessed the influence of simulated night work on HR and HRV, and dissociated the direct effects of circadian misalignment from those of sleep displacement and altered physical activity patterns. A total of 29 subjects each participated in one of two in-laboratory, simulated shift work studies. In both studies, EKG was continuously monitored via Holter monitors to measure HR and the high frequency (HF) component of HRV (HF-HRV). We found endogenous circadian rhythmicity in HR and HF-HRV. Sleep and waking physical activity, both displaced during simulated night work, had more substantial, and opposite, effects on HR and HF-HRV. Our findings show systematic but complex, interacting effects of time of day, sleep/wake state, and physical activity on cardiac autonomic activity. These effects need to be taken into account when evaluating HR and HRV in shift work settings and when interpreting these measures of cardiac autonomic activity as markers of cardiovascular disease.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Cardiac autonomic activity during simulated shift work

et al. 2019

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“…The reduced total sleep time observed in the two Australian studies (28 and 48 min) is of a scale similar to that shown to cause progressive deterioration in cognitive performance in other occupations (e.g. doctors, navy watchmen) over successive days (Anderson et al 2012;Skornyakov et al 2017). Further research is needed on the implications of cumulative sleep loss in a wildland firefighting context.…”

Section: Factors That Influence Sleep During Wildland Firefightingmentioning

confidence: 77%

Sleep in wildland firefighters: what do we know and why does it matter?

Vincent

Aisbett

Wolkow

et al. 2018

Int. J. Wildland Fire

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Wildland firefighters perform physical work while being subjected to multiple stressors and adverse, volatile working environments for extended periods. Recent research has highlighted sleep as a significant and potentially modifiable factor impacting operational performance. The aim of this review was to (1) examine the existing literature on firefighters’ sleep quantity and quality during wildland firefighting operations; (2) synthesise the operational and environmental factors that impact on sleep during wildland firefighting; and (3) assess how sleep impacts aspects of firefighters’ health and safety, including mental and physical health, physical task performance, physical activity and cognitive performance. Firefighters’ sleep is restricted during wildfire deployments, particularly when shifts have early start times, are of long duration and when sleeping in temporary accommodation. Shortened sleep impairs cognitive but not physical performance under simulated wildfire conditions. The longer-term impacts of sleep restriction on physiological and mental health require further research. Work shifts should be structured, wherever possible, to provide regular and sufficient recovery opportunities (rest during and sleep between shifts), especially in dangerous working environments where fatigue-related errors have severe consequences. Fire agencies should implement strategies to improve and manage firefighters’ sleep and reduce any adverse impacts on firefighters’ work.

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“…The two-process model of sleep regulation (Borbély & Wirz-Justice, 1982), focused on circadian and homeostatic sleep processes, is a particularly relevant theoretical framework for examining our findings. U.S. Navy members routinely experience both sleep deprivation (Harrison et al, 2017) and circadian misalignment (Skornyakov, et al, 2017), and prior research has demonstrated clear relationships between these circadian and homeostatic sleep processes and depression. Reduced slow wave sleep activity in depression is hypothesized to result from impairments in sleep homeostasis (Borbély & Wirz-Justice, 1982), and circadian rhythm dysregulation is common among those with mood disorders (Rumble, White, & Benca, 2015).…”

Section: Discussionmentioning

confidence: 99%

Work stressors, depressive symptoms and sleep quality among US Navy members: a parallel process latent growth modelling approach across deployment

Bravo

Kelley

Swinkels

et al. 2017

Journal of Sleep Research

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The present study examined whether work stressors contribute to sleep problems and depressive symptoms over the course of deployment (i.e. pre-deployment, post-deployment and 6-month reintegration) among US Navy members. Specifically, we examined whether depressive symptoms or sleep quality mediate the relationships between work stressors and these outcomes. Participants were 101 US Navy members who experienced an 8-month deployment after Operational Enduring Freedom/Operation Iraqi Freedom. Using piecewise latent growth models, we found that increased work stressors were linked to increased depressive symptoms and decreased sleep quality across all three deployment stages. Further, increases in work stressors from pre- to post-deployment contributed to poorer sleep quality post-deployment via increasing depressive symptoms. Moreover, sleep quality mediated the association between increases in work stressors and increases in depressive symptoms from pre- to post-deployment. These effects were maintained from post-deployment through the 6-month reintegration. Although preliminary, our results suggest that changes in work stressors may have small, but significant implications for both depressive symptoms and quality of sleep over time, and a bi-directional relationship persists between sleep quality and depression across deployment. Strategies that target both stress and sleep could address both precipitating and perpetuating factors that affect sleep and depressive symptoms.

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Sleep and performance in simulated Navy watch schedules

Cited by 11 publications

References 25 publications

Cardiac autonomic activity during simulated shift work

Cardiac autonomic activity during simulated shift work

Sleep in wildland firefighters: what do we know and why does it matter?

Work stressors, depressive symptoms and sleep quality among US Navy members: a parallel process latent growth modelling approach across deployment

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