Figure - uploaded by Anne P Hillstrom
Content may be subject to copyright.
Source publication
Similar publications
Citations
... Cognitive testing of sleep-deprived people has demonstrated declined performance on psychomotor vigilance tests [23,25,26]. Our study confirms that a person's chronotype has an impact on the outcome of cognitive tests, depending on the time of day [27]. Furthermore, numerous studies have shown a relationship between long working days, insufficient sleep and decreased performance on such tests [28]. ...
... The SRT test targeting attention (3-minute test), did not detect fatigue in the form of slowed RT but revealed cognitive decline by indicating significantly more major lapses (RT > 1000 ms) at the end of the test, possibly, due to lower sensitivity demonstrated in shorter tests [30]. These results are in accordance with the main measure of psychomotor vigilance tests and the most commonly used variable, which is not to assess the RT but to measure sustained attention and give numerical measures of sleepiness by counting the number of lapses in attention across tested occasions [27]. Furthermore, comparing the halves of the SRT tests, the SD increases in the second half of the test. ...
This study examines the impact of work-related exposure on the cognitive performance of Faroese deep-sea fishers. Faroese fishing crews work long hours in demanding and noisy environments amidst highly uncertain and challenging weather conditions. These factors, together with compromised patterns of rest and sleep, are known to increase fatigue. Our aim was to study if changes could be measured in fishers’ cognitive performance at the end of the trip when compared with the baseline measure at the beginning.
Data was collected over 15 months (May 2017 to July 2018) from 157 fishers on 18 fishing trips which involved 202 investigative days on board. Questionnaires and six computerised cognitive tests: Simple Reaction Time, Numeric Working Memory, Corsi Blocks, Rapid Visual Information Processing, Digit Vigilance, and Card Sorting Test were used for data collection at the beginning and end of the trip. Differences between the outcomes on the two test points were analysed with one-way ANOVA comparing the performances at the beginning and end of the voyage, and two-way ANOVA to examine the interactive effect of chronotype and test occasions on the outcomes. Mixed models were used to test for the effects of predictor variables.
Significant declines in cognitive performance were observed from the beginning to the end of the trip, with decreases in visuospatial memory and reaction times, and increases in cognitive lapses. Furthermore, slowing in response times was observed in the second half of the Digit Vigilance test when comparing the halves.
Declines in performance were observed from the start to the end of the trip. Furthermore, fishers performed significantly worse in the second half of some parted tests, and evening types seem less influenced by irregular work hours. These findings call for improving the safety of the vessels and their crew.
... fibromyalgia and temporomandibular joint dysfunction); physical discomfort, pain and memory and/or cognitive degradation [3,4], resulting in sickness absenteeism and work disability [5,6]. Furthermore, fatigue is a risk factor for occupational safety, particularly in the transport industry [3] including shipping [3,[7][8][9][10][11]. Fatigue in ferry shipping is especially hazardous as it may jeopardise passengers' safety [12,13]. ...
... However, variations in fatigue levels may suggest that some sub-groups still require interventions, for instance those working in the terminal and/or non-officers. Further, fatigue has been found to rise over time of duty, also in ferry shipping [9,42,48], and even fatigue levels that are not critically high from a perspective of individual health and well-being can endanger the safety of the crew and passengers [3,7]. In addition, the present study mainly focused on services where ferry ships were laid up overnight. ...
Background:
Fatigue is a recognised risk factor for safety in seafaring. While always dangerous, fatigue in ferry shipping is especially hazardous as it may jeopardise passengers' safety. To counteract fatigue, knowledge on its determinants is important. Little, however, is known on the influence from physical and psychosocial work environment factors within ferry shipping. The aim of the study was to investigate the association between work stress in terms of physical stressors, perceived job demands and job control and different dimensions of fatigue among ferry ship employees and to test whether a potential effect of work stress was mediated by sleep satisfaction.
Materials and methods:
The design was cross-sectional. 193 respondents answered to a self-administered questionnaire including standardised scales, i.e. the Swedish Occupational Fatigue Inventory and the Copenhagen Psychosocial Questionnaire for job demands and control. The association of risk factors with fatigue was determined using hierarchical multiple linear regression analyses.
Results:
Physical work stressors were positively associated with only one of five fatigue subscales: lack of energy. Higher levels of demands were related to more lack of energy, lack of motivation, physical exertion and sleepiness, while more control was related to lesser lack of energy, lack of motivation and sleepiness. No demand-control interaction was found. Effects of demand and control were partly mediated by sleep satisfaction.
Conclusions:
Although limited by its cross-sectional design this study provides support for the independent relevance of demands and control for employee fatigue in ferry shipping and for a mediating role of sleep satisfaction.
... Fatigue at sea is increasingly being recognised as a risk factor in naval maritime industry [5]. Stress, workload and sleep problems have been identified as important contributors to reductions in health, safety and motivation [5]. ...
... Fatigue at sea is increasingly being recognised as a risk factor in naval maritime industry [5]. Stress, workload and sleep problems have been identified as important contributors to reductions in health, safety and motivation [5]. In particular, sleep has a robust relationship with the safety and welfare of seafarers and much effort goes into managing sleepiness and fatigue. ...
... In particular, sleep has a robust relationship with the safety and welfare of seafarers and much effort goes into managing sleepiness and fatigue. a recent rapport [5] concludes that sleepiness and fatigue may be significant contributing factors in accident causation, which can result in injuries, pollution and damage to property as well as company reputation. a study found differences between officers' ratings of actual sleep and ideal sleep length [5]. ...
Background:
Sleep is increasingly being recognised as important for the health and well-being of sailors. The aim of the current study is to investigate the relationship between hardiness and reported insomnia-symptoms in a maritime military setting during a 4-month counter piracy naval mission in the Gulf of Aden.
Materials and methods:
A sample of 281 officers, sailors, and enlisted personnel were measured on levels of hardiness before the mission. The participants were split into low and high hardiness groups based on the group level mean. Insomnia-symptoms were measured before, midway and at the end of the mission.
Results:
The results showed a significant main effect of time and a significant main effect of hardiness. The crew experienced the most insomnia symptoms in the middle of the mission and the high hardy group experienced less insomnia symptoms, in total, during the mission. There was also found a significant interaction effect of time and hardiness. The high hardiness group experienced less insomnia symptoms before and towards the end of the mission.
Conclusions:
The results indicate that high levels of hardiness may be a protective factor between the stressors of a naval mission and symptoms of insomnia.
