About
18
Publications
5,599
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
69
Citations
Citations since 2017
Introduction
Skills and Expertise
Publications
Publications (18)
Bringing together researchers from across the social sciences, this special issue provides insights on the sociological, socio-technical, psychological and health-related aspects of living and working on board today’s international merchant vessels. Most of the articles are based on presentations at the Visby Maritime Symposium, “International Merc...
Ships typically operate on a 24/7 basis giving rise to a wide variety of working time arrangements and watch keeping schedules. Typically, these can be divided into 2-watch systems (where two watch keepers/teams share the 24-h period) and 3-watch systems (where three watch keepers/teams share the 24-h period). The current study uses the three-proce...
Operating on a 24/7 basis has made the maritime industry invent a wide variety of watch keeping systems over the past centuries. These are either two-watch systems (2 teams sharing the work under a 24h period) or three-watch system (3 teams sharing it). This study aims to identify which systems are associated with the lowest amount of fatigue risk...
The consequences of fatigue for the health and safety of seafarers have caused concern in the industry and among academics, and indicates the importance of further research into risk factors and preventive interventions at sea. This chapter gives an overview of the key issues relating to seafarer fatigue. A literature study was conducted aimed at c...
Since 8 hours off compared to 6 hours off between watches provides seafarers with 2 hours extra for rest and sleep, it is hypothesized that the 8/8-system is associated with higher sleep quantity and quality as well higher on-watch alertness when compared to the 6/6-system.
This is the first field study to investigate the effect of extended periods at sea on the development of fatigue and sleep (problems) among seafarers.
The UK Maritime and Coastguard Agency (MCA) wished to investigate the 8 hours on/8 hours off watch keeping system, with the aim of providing an answer to the following question: "What is the effect of working an 8 hours on/8 hours off watch keeping system on seafarer fatigue, performance and safety?"
The following methodology was adopted, which inc...
Although anecdotic reports are frequent, real field studies on long-term fatigue and sleep at sea are lacking. This will be he first such study, testing the hypothesis that sleepiness and fatigue will increase with time at sea.
Seafarer sleepiness jeopardizes safety at sea and has been documented as a direct or contributing factor in many maritime accidents. This study investigates sleep, sleepiness, and neurobehavioral performance in a simulated 4 h on/8 h off watch system as well as the effects of a single free watch disturbance, simulating a condition of overtime work,...
Fatigue among watch keepers is a growing concern in the maritime industry. This study investigated sleep, sleepiness, and performance on watch in a simulated 6h on/6h off watch system on the bridge and in the engine room.
Seafarer fatigue jeopardizes safety at sea and contributes to maritime accidents. This study investigated sleep and sleepiness on watch in a simulated 4h on/8h off (4/8) versus a 6h on/6h off (6/6) watch system as well as the effects of disturbance of a free watch, simulating overtime work.
• Seafarer fatigue – with ships being operated on a 24/7 basis – poses a risk to traffic safety at sea and has already contributed to many accidents • This study investigates sleep and sleepiness in a simulated 4 on / 8 off watch system during 1 week • In addition, the effects of a disturbed free watch on sleep and sleepiness during the subsequent...
• Fatigue at sea is a safety issue that has hardly been studied before • This study investigates sleep and sleepiness in a simulated 6 on /6 off watch system during 1 week • Both bridge and engine room simulators are used during a 1 week simulated voyage through the North Sea and English Channel.
• Seafarer fatigue – with ships being operated on a 24/7 basis – poses a risk to traffic safety at sea and has already contributed to many accidents • This study investigates subjective and objective sleepiness in a simulated 4 on /8 off watch system during 1 week • In addition, the effects of a disturbed free watch on sleepiness during the subsequ...
It has always been a challenge to evaluate the effectiveness of maritime education and training due to the difficulty in gaining access to the students once they have finished their training and returned to sea. The research team at Warsash Maritime Academy has elected to meet this challenge by developing a novel approach to evaluation, which it is...
Projects
Projects (4)
Project EIGHTS main aim was to compare the 6on6off maritime watch system with the 8/8/8 system. Both systems were compared in a field study where all participating dredger crew worked for three weeks under one system before crossing over to the other system. Sleepiness, stress, fatigue, and usage of fatigue countermeasures were measured and actigraphs were worn. In addition, a theoretical comparison between the two watch systems was made using the Three Process Model of Alertness regulation (TPMA). The project was funded by the British MCA and carried out in collaboration with Warsash Maritime Academy.
Project MODEL looks into the hours of work and rest in different watch keeping regimes as well as among fishermen and tug crews. Working times will be modelled and possibilities for sleep as well as fatigue levels will be predicted based on the Three Process Model of Alertness regulation (TPMA). Furthermore, it will be investigated how different circadian types (morning vs. evening people) will be affected by the different working time regulations. Finally, it will be tested how sensitive each working time arrangement is to over-time work. Schedules under investigation include for instance 6 on 6 off, 4 on 8 off, 12 on 12 off, 8 on 8 off, different variations of the 7/5/5/7-system as well as the the five and dime system.
