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J Occup Health 2010; 52: 249–256
Received Mar 14, 2010; Accepted Jun 23, 2010
Published online in J-STAGE Jul 22, 2010
Correspondence to: M. Oldenburg, Department of Maritime
Medicine, Institute for Occupational and Maritime Medicine
(ZfAM), Seewartenstra
β
e 10, D-20459 Hamburg, Germany
(e-mail: marcus.oldenburg@bsg.hamburg.de)
Journal of
Occupational Health
Occupational Risks and Challenges of Seafaring
Marcus OLDENBURG1, 2, Xaver BAUR2, 3 and Clara SCHLAICH2
1Department of Maritime Medicine, 2Hamburg Port Health Centre, Institute for Occupational and Maritime Medicine
and 3University Medical Centre Hamburg-Eppendorf, Germany
Abstract: Occupational Risks and Challenges of
Seafaring: Marcus OLDENBURG, et al. Department of
Maritime Medicine, Institute for Occupational and
Maritime Medicine, Germany—Seafarers are
exposed to a high diversity of occupational health
hazards onboard ships. Objective: The aim of this
article is to present a survey of the current, most
important hazards in seafaring including
recommendations on measures how to deal with these
problems. Methods: The review is based on maritime
expert opinions as well a PubMed analysis related to
the occupational risks of seafaring. Results: Despite
recent advances in injury prevention, accidents due to
harmful working and living conditions at sea and of non-
observance of safety rules remain a main cause of
injury and death. Mortality in seafaring from
cardiovascular diseases (CVD) is mainly caused by
increased risks and impaired treatment options of CVD
at sea. Further, shipboard stress and high demand
may lead to fatigue and isolation which have an impact
on the health of onboard seafarers. Communicable
diseases in seafaring remain an occupational problem.
Exposures to hazardous substances and UV-light are
important health risks onboard ships. Because of harsh
working conditions onboard including environmental
conditions, sufficient recreational activities are needed
for the seafarers’ compensation both onboard and
ashore. However, in reality there is often a lack of
leisure time possibilities. Discussion: Seafaring is
still an occupation with specific work-related risks.
Thus, a further reduction of occupational hazards
aboard ships is needed and poses a challenge for
maritime health specialists and stakeholders.
Nowadays, maritime medicine encompasses a broad
field of workplaces with different job-related challenges.
(J Occup Health 2010; 52: 249–256)
Review
Key words: Communicable diseases, Disaster,
Occupational cancer, Occupational risks, Seafaring,
Stress
Occupational Risks in Seafaring
Disasters and accident rates
In the last few decades the disaster and accident rates
in seafaring have fallen sharply1). According to a study
on fatal work-related accidents onboard UK merchant
shipping from 1919 to 2005, large reductions were found
for mortality rates in fatal disasters and personnel
accidents over the course of time2). This trend has been
confirmed by other studies. Major causes of mortality in
shipping disasters were vessels foundering in typhoons,
storms and heavy gales, explosions in cargo holds and
collisions due to poor visibility. Considering the types
of ship the highest mortality rates, up to 400 per 100,000
seafarer-years, were found among fishermen3).
Rough weather, insufficient awareness of safety, lack
of use of personal protective devices as well as
inexperience are regarded as the main causes of fatal
injuries related to work. Many of the fatal occupational
accidents happen among deck ratings and deck officers
and a recurrence of similar accident types is observed,
such as falls into or inside cargo holds, falls overboard
or being struck by heavy seas on deck. Fatal injuries
during off-duty hours are often associated with alcohol
consumption. International Maritime Organization (IMO)
statistics reveal that 80% of accidents onboard cargo ships
are caused by the human factor4).
The available mortality studies about English, Danish
and Polish seafarers onboard merchant ships cover the
1980s and 1990s5–7). The non-natural causes were divided
into accidents occurring during the off-duty hours,
occupational accidents occurring as a direct consequence
of work onboard and maritime disasters (death caused
by shipwreck or capsizing) (Fig. 1). In total, the non-
natural causes ranged between 40% and 50% of all deaths
in these studies. Natural causes in terms of diseases were
found in 36% to 42% of all deaths in the three studies.
250 J Occup Health, Vol. 52, 2010
According to a Danish mortality study, the incidence
of accidents among seafarers was 11.5 times higher than
among the Danish male workforce ashore6). An
explanation offered by the authors is the risk of maritime
disasters in which the workplace itself disappears or is
severely damaged.
Recommendations: Occupational measures are required
to diminish fatal accidents onboard. They should include:
·training and instruction of seafarers in safe behavior
on board, for example during the medical refresher
course
·comprehensive information onboard to raise awareness
on the use of personal protection devices, including
onboard programs in terms of primary and secondary
prevention
·intensified education in the official language on board
(usually English).
All these measures are of importance and a challenge for
maritime health specialists and researchers.
Piracy
In recent years, the issue of piracy has gained
international topicality. The International Maritime
Organization has summarized all incidents of piracy and
armed robbery against ships reported to the Organization
since 19848). The number of acts of piracy and armed
robbery against ships reported to have occurred or to have
been attempted from 1984 until December 2009 was
5,224. In 2009, 403 incidences were observed with a
rising tendency since mid 1990s. Worldwide, the areas
most affected by piracy are the South China Sea, the
coasts of East and West Africa and the Indian Ocean. In
2008, 774 crew members were reportedly taken hostage/
kidnapped and about 38 crew members were still
unaccounted for; 1 vessel was reportedly still unaccounted
for, and 51 ships were reportedly hijacked.
Recommendations: The IMO is implementing an anti-
piracy project, focusing on a number of regional seminars
and workshops attended by Government representatives
from countries in piracy-infested areas of the world. The
ship operators, shipmasters and crew should
comprehensively be advised on prevention and suppression
of acts of piracy and armed robbery against ships.
Impaired treatment options of cardiovascular diseases
at sea
Apart from accidents and work-related injuries acute
CVD is the main cause of death—both at sea and on land
in industrialized countries. In the 1980s and 1990s deaths
due to CVD accounted for 55% to 70% of all natural
causes of death among seamen on British and Danish
merchant ships5, 6). Deaths due to other illnesses
(gastrointestinal, infectious diseases or neoplasm) appears
to have played minor roles.
In other mortality studies, the CVD mortality rate was
found to be from 27 to 45 per 100,000 seafarer-years.
This mortality does not significantly differ from that of
the respective general population ashore, but a healthy
worker effect has to be taken into account among seafarers
who are subjected to pre-employment examinations and
medical surveillance including medical-fitness tests for
nautical service9).
An important difference in the treatment of seafarers
at sea is that medical care onboard is applied by a medical
health officer who is not a medical professional. The
STCW Code (Seafarers’ Training Certification and
Fig. 1. Causes of deaths of seafarers employed on English, Danish, and Polish merchant ships.
251Marcus OLDENBURG, et al.: Occupational Medicine
Watchkeeping, 1978) defines the standard of competence
for such seafarers designated to provide medical first aid
onboard ship10). These seafarers must be able to take
immediately effective actions in the case of accidents or
illness likely to occur on ships.
The treatment options for CVD occurring at sea are
impaired owing to the nature of the rescue team onboard,
the frequently delayed resuscitation actions, the
limitations of treatment onboard as well as the problems
of evacuation ashore. Jaremin and Kotulak (2003)11)
showed in their mortality study covering more than 11,000
Polish seafarers and deep sea fishermen that only one
quarter of the persons with myocardial infarction at sea
was still alive one year after the onset of the acute cardiac
event. As this survival rate significantly differs from that
of Polish employees ashore, it was assumed by the authors
that the myocardial infarction prognosis at sea is worse.
Recommendations: Generally, it should be mentioned
that the possibilities of modern treatment of
cardiovascular diseases (such as acute percutaneous
transluminal coronary angioplasty (PTCA), lysis or
aortocoronary venous bypass (ACVB)) have
fundamentally improved the survival of affected patients
ashore. However, these treatment options necessitate
profound medical/surgical experience; thus they are not
available onboard ships.
During medical surveillance examinations, seafarers
at high risk of cardiac events need to be identified in a
reliable way in order to reduce morbidity and mortality.
Nowadays, well established risk-scores exist allowing
assessment of the likelihood of an initial episode of heart
disease. Seamen with an observed high coronary risk
should be advised and treated according to the
recommendations of the International Task Force for the
Prevention of Coronary Heart Disease12). Based on our
results, the most important practical measures available
to decrease CVD risks among seafarers are training cooks
in low-fat diets, offering smoking cessation programs and
treatment of elevated blood pressure9).
For medical treatment at sea the responsible officer
should seek telemedical advice from a radiomedical
physician ashore. It is strongly recommended that
transmissions of telemedical ECG be made available to
the telemedical assistant service to facilitate diagnoses
of patients with unspecific chest pains, especially in cases
of potentially arrhythmic heart diseases.
High load of work-related stress in seafaring
As early as 1998 Agterberg and Passchier described
higher work-related stress in seamen than in the general
population13). Seafaring is associated with special mental,
psychosocial and physical stressors and cannot be
compared with jobs ashore. The working and living
conditions of seafaring are characterized by long-time
separation from family and home for months, economic
pressure as well as considerable and sometimes extreme
psychosocial problems.
In a standardized interview, 134 male seafarers sailing
on German-flagged vessels were asked about their living
and working conditions onboard14). The seamen rated
the individual stress level of 23 different stressors aboard.
This study revealed that separation from the family, time
pressure/ hectic activities, long working hours per day,
heat in workplaces, and insufficient qualifications of
subordinate crew members were the most important
stressors onboard. This study also showed considerable
differences in the duration of shipboard stay between
European and non-European seafarers. Some studies
found an average contract duration from 3 to 6 mo for
European seamen and from 6 to 9 mo for Non-European
ones9, 15). Seafarers with a shipboard stay of more than
12 mo often feel confined onboard a ship. This extreme
long stay is a serious occupational problem because
seamen on such contracts normally have no possibilities
to meet their families during this time period or to follow
other leisure time activities.
Recommendations: On account of the extraordinary
multiplicity of job-related stressors in seafaring, particular
attention should be paid to preventive occupational and
organizational measures. According to the above
mentioned results, it is especially important to shorten
the duration of shipboard stay in order to reduce long-
time separation from family and to minimize extremely
long working hours.
Further, the medical training courses for ship officers
should include prevention messages. The high smoking
consumption of seafarers needs to be paid more attention
through anti-smoking campaigns9, 16, 17). Besides life-style
factors, seafarers should learn how to prevent and how
to manage stress, for instance by making use of relaxation
techniques.
Current studies exploring the efficiency of stress-
prevention strategies are needed.
1) Fatigue
High stress load and isolation may cause
psychosomatic disorders including burn-out syndrome
and fatigue.
There are several reasons for fatigue among seafarers
and fatigue is a major occupational problem aboard many
modern ships. According to the Maritime Labour
Convention (2006) all ships must have a sufficient number
of seafarers employed onboard to ensure that ships are
operated safely and efficiently18). In the last decade,
however, the number of crew members onboard has
decreased considerably. Reduction of Safe Manning
Level leads to reduced shipboard safety and increases
the risk of accidents with possible severe, life-threatening,
environmental and economic consequences.
Further, high job demands and long working hours
252 J Occup Health, Vol. 52, 2010
which are often present in 2 watch systems can result in
fatigue. Crews become more exhausted and tired due to
long working days, especially when having frequent port
turnarounds. Although the relationship between working
hours and mental health problems has not been fully
clarified yet, it is assumed that occupational stressors,
such as long working hours, might impair workers’ health
both psychologically and physically19, 20).
The duration and the quality of sleep are also important.
Sleep requirements and habits may individually vary
considerably but everyone requires unbroken periods of
rest. According to the Maritime Labour Convention
(2006) the maximum hours of work should not exceed
14 h in any 24-hour period and 72 h in any 7-day period18).
There is a strong association between the number of hours
seamen work and sleep deprivation.
Environmental factors such as noise, vibration and
adverse weather conditions also disturb sleep quality.
Recommendations: According to the UK Maritime and
Coastguard Agency (2007) suitable measures to
counteract acute fatigue are to take a break, to have a
nap, to have a drink (water is best) and/ or to have
something to eat (not too heavy). To cope with fatigue,
seafarers should get enough recreational and rest time.
Further, seafarers should ensure that the schedule of their
duties is realistic and can be adhered to in all normal
circumstances. Additionally, shipping companies need
to check the manning levels onboard their ships.
2) Isolation
In recent years, a development in merchant seafaring
has occurred in which reduced crew size owing to modern
techniques has lead to increased workload aboard. The
shortening of turn-around times has resulted in decreased
duration of ship’s stay in port and it has consequently
minimized crews’ social contacts21). Further, the access
for seafarers to areas next to ships has been prohibited
for several years. As a preventive measure against
security incidents affecting ships or port facilities used
in international trade the International Ship and Port
Facility Security (ISPS) Code came into force in 2004.
It is a comprehensive set of measures to enhance the
security of ships and port facilities and was developed in
response to the perceived threats to ships and port
facilities in the wake of the 9/11 attacks in the United
States. The requirements for ships and for port facilities
include the monitoring and controlling of access of people
as well as cargo. In consequence, it is normally very
cumbersome for seamen to leave the ship during a port
stay and pass the port safety barriers. Thus, many seafarer
don’t make the effort to stay ashore in welfare facilities
which unfortunately are often far away from the vessels’
embarkation point.
Seafarers are among the most isolated demographic
working groups in the world, a circumstance which also
refers to access to medical care, both in emergency
situations and for primary health care. As the physical
demands and health requirements of seafaring are
rigorous and the job market appears competitive, many
seafarers are reluctant to seek medical and psychological
help. Some seamen compensate shipboard isolation with
high alcohol consumption. Cheng et al. (2008)
investigated the relationship of occupational stress and
social support with health-related behaviours of smoking
and alcohol consumption among Chinese offshore oil
workers and concluded that work-related stress can affect
health-related behaviours; e.g. alcohol consumption was
positively related to perceived stress from “interface
between job and family/social life”22). Further, it has also
been observed that occupational stress is associated with
digestive problems23). The results of another study
suggested that stress due to management problems and
relationships with others might promote work-related
unintentional injuries24).
In the worst cases strong isolation can lead to despair,
depression and finally to suicide. The largest cause of
traumatic work-related fatalities among British seafaring
sub-groups was suicide25). Couper (1996) cited a threefold
increase in suicide among seafarers, as compared to the
general population26). The main causes for seafarers’
suicides other than isolation are trouble with problems at
home, mental stress and strain onboard or motion sickness
leading to a breakdown in personality and/or the will to
live27).
Recommendations: Measures to diminish isolation in
seafaring are improvements in to-shore
telecommunications (at reasonable charge, guaranteed
privacy of the messages, free access to all ranks) and
promotion of social contacts onboard as well in the port
(shipboard sport events, easily accessible welfare
facilities, pastoral care and anonymous seafarer’s health
counselling). Further, much effort must be paid to
facilitate the access of the seafarers to port welfare
facilities.
In cases of strong isolation, which tends to increase
the risk of suicide, psychological support must be
available in seafarers’ port welfare facilities.
3) Multinational crews
Shipboard stress may be a consequence of the specific
psychosocial demands on ships. Besides a heavy work-
load and isolation, multinational crews have been
recognized as a stressor. Approximately 65% of the
world’s merchant fleet is manned with multinational
crews28). Crews consist not only of many different
nationalities but also of members from different religious
and cultural backgrounds. Reflecting this, different needs,
values and expectations exist29).
Today, most seafarers originate from South East Asia,
predominately from the Philippines. Generally, they
253Marcus OLDENBURG, et al.: Occupational Medicine
provide cheaper labour than seafarers from Western
Europe, they are easier to recruit and to keep in business.
Many Philippines seafarers are doing low skilled or
unskilled work and they are subject to poor social security.
Although their stays on board often last for a long time,
they usually have only short duration contracts. That
means that their contracts are restricted only to temporary
voyages and afterwards they have to reapply for a
subsequent contract at specific agencies. If they lose their
job due to temporary unfitness, it is scarcely possible for
them to find subsequent employment on a ship. Although
multinational crews do not necessarily lead to isolation,
the often observed communication problems onboard may
cause isolation30).
Most of the available studies about occupational health
and safety at sea concern populations from Europe.
However, little is known about the large number of
seafarers from South East Asia and other parts of the
world. The known lower level of emotionally expressive
behaviour of Asians may have an impact on seafarers’
safety and is possibly caused by neural time course
differences of the populations in the processing of
emotional events31). Due to genetic variations in the South
Asian population, differences in the individual genetic
susceptibility or resistance to diseases of Asians are
assumed32).
Recommendations: Kahveci et al. (2001) performed a
study from 1999 to 2001 aboard 14 ships and interviewed
more than 510 seafarers33). They found that multinational
crews can operate extremely successfully under conditions
which need to be introduced or developed onboard. These
were: high levels of fluency in the working language of
the ship among both officers and ratings; policies
encouraging stable crewing; promotion of social activities
onboard via masters and senior officers; minimize the
circulation of materials reinforcing cultural and national
stereotypes which can often be found onboard.
4) Limited opportunities for recreation
The often observed lack of leisure time facilities, such
as fitness-rooms or social events, often impairs seafarers’
well-being onboard ship. Regular, vigorous exercise
contributes to a general sense of physical, psychological
and social well-being and stops unused muscles becoming
flabby thereby reducing the risk of accident or injury.
Sport not only improves health but, due to social
interaction, it also encourages team-building. Well-being
onboard is essential for seafarer’s health promotion and
also for ship security. The occurrence of psycho-
emotional stress of seafarers is often associated with
disturbed sexual life and with disturbed working and
resting regimes due to time zone changes34).
Recommendations: Ship managers as well as the
shipping company can organize social and sport events
or provide well-equipped fitness-rooms onboard. Quality
of life onboard, especially leisure time as an important
source of recreation, needs to be improved.
Environmental stressors on board
Not only during working time but also during leisure
time seafarers are continuously exposed to ship-related
environmental stress factors such as ship motion, noise
and vibration. These factors are perceived as stressful
(especially during sleeping times) and can distinctly
impact the recreational value of leisure time. Further,
depending on the weather, ship motion can be very
stressful. Severe seasickness can distinctly impair a
crew’s well-being onboard and seafarers suffering from
it are incapable of changing it if they do not respond to
treatment or medication is not available on board.
Recommendations: Reduction of the exposure levels
to noise in all accommodation, recreational and catering
facilities is critical. Seafarers should be informed about
the adverse effects of exposure to excessive noise on the
hearing and instructed in the proper use of noise protection
devices and equipment.
Communicable diseases
International travel and trade is associated with an
increased risk of spreading communicable diseases across
borders. Outbreak reports and systematic studies mainly
rely on disease activity on cruise ships. A systematic
review of the literature conducted by the WHO revealed
that more than 100 disease outbreaks were associated with
ships during the period from 1970 to 200035).
Most publications of infectious disease risk onboard
are based on data from pre-employment exams, reports
of port clinics and case/outbreak examinations. In a study
conducted by our institute the documented entries in 49
medical log books from seagoing cargo ships under the
German flag between 2000 and 2008 were evaluated in
order to assess the incidence rate of communicable
diseases onboard. Nearly one fourth of the visits to the
ships’ infirmary were due to presumably communicable
diseases with 75% of those being classified as acute
respiratory diseases36).
Disease outbreaks due to Novovirus or influenza A and
B infection on cruise or military ships have been
repeatedly reported37, 38). Recently, the novel influenza A
H1N1 has attracted worldwide attention. Other
communicable disease risks which have been documented
in seafarers are vaccine-preventable diseases, such as
rubella, chickenpox, measles, influenza and other
respiratory diseases (tuberculosis)39, 40).
Vector-born diseases are a well known risk to seafarers.
The occurrence of malaria has been documented as an
occupational hazard. Other vector-born diseases have
not been described in seafarers yet, but occur frequently
among travellers in regions at risk of these diseases, such
as Dengue Fever and Chikungunya Fever; thus seafarers
254 J Occup Health, Vol. 52, 2010
can be assumed to be a population at risk41, 42).
Blood-born and sexually-transmitted diseases (Hep B,
C , HIV) also pose a risk to seafarers who have to rely on
local health systems in port. Also unsafe procedures,
such as tattooing or unsafe sex, play a role. According to
a survey among 158 seafarers visiting the International
Seamen’s Club in the port of Hamburg nearly 20% of
seafarers stated having casual sexual contacts while away
from home43).
A main cause for the spread of communicable diseases
onboard is that crew members with different susceptibility
to infection share living quarters, common food and water
supplies as well as sanitation and air-conditioning
systems44). At present, onboard food and water hygiene
is highly variable and may be a source of disease, such
as gastrointestinal or legionnaire’s disease45, 46).
Recommendations: Preventive measures such as
proper water and food sanitation, access to safe medical
care in ports (with anonymous testing of sexual
transmitted diseases and health counselling), vaccination
of crew, allocation of seafarers to single cabins, early
treatment and isolation of infectious/respiratory diseases
may be useful tools for safeguarding ship operation.
Occupational cancer
Most of the available cancer studies of seafarers are
from the Swedish Family-Cancer Database from 1961 to
1998. For example, according to Nilsson (1998), in
Swedish engine officers and ratings age-standardized
cumulative cancer incidence ratios (SIR) for lung cancer
were more than twice as high as expected47) (SIR 2.1).
Occupational exposure to benzene may have contributed
to the increased risk of chronic myeloid leukaemia (SIR
3.15)48). Further, exposure to sunlight has been found to
be associated with significantly elevated incidences of
lip cancer among seafarers (SIR 2.74)49).
The causes of the elevated risk of some cancers among
seamen are not clear, but life-style related factors such
as alcohol, smoking and diet have been regarded as
causative. Further, exposures to UV-light from the sun
during voyages represent a risk for skin cancer
(particularly near the equator where exposure is 2 to 4
times higher than in Northern-Europe).
Ships transport all kinds of goods including toxic
cargoes. Particularly, crews on chemical and product
tankers can have contact with them. Product tankers
mainly carry petroleum products such as gasoline,
whereas chemical tankers transport a wide range of
chemicals including petroleum products. Especially
during tank cleaning, loading and unloading of gasoline,
high benzene concentrations up to some 100 ppm have
been measured47). Transport containers frequently have
high concentrations of fumigants and/or toxic industrial
chemicals50). Although these containers are not usually
opened during the voyage they are not tight and some
exposures take place.
Further, the engine room crew is exposed to a variety
of exposures with possible harm to health, such as
polycyclic aromatic hydrocarbons. Moen et al. (1996)
found traces of degraded hydrocarbon products and other
chemicals in the urine of ship engineers51). The clinical
importance of these findings, however, is still unclear.
In accommodation aboard tankers, toxic substances can
also accumulate and affect the indoor climate in some
cases. Asbestos was commonly used as an insulating
material in ship building until the mid 1970s. In the last
30 yr, however, asbestos has only been used in
shipbuilding to a very limited extent.
Recommendations: Ongoing training and safe handling
of hazardous substances as well as in the proper use of
personnel protection devices is needed. As heavy
smoking and alcohol habits may also considerably
contribute to the increased risk of some cancers, seafarers
should be advised on abandoning unhealthy lifestyles
including excessive exposure to UV-light.
Seafarers handling toxic substances should be subjected
to repeated bio-monitoring examinations during their
medical fitness tests for nautical service in order to detect
hazardous exposures at an early stage.
Conclusions
Seafaring is characterized by several occupational
risks: accidents and maritime disasters, piracy, impaired
treatment options for CVD, high shipboard stress levels
including fatigue and isolation, communicable diseases
and exposures to hazardous substances. Despite
improvements in occupational safety standards onboard,
seafaring is still a high risk occupation, not only during
working hours but also during leisure time.
The most important measures for diminishing the
occupational health risks of seafaring include primary
and secondary prevention of work-related hazards arising
from unsafe practices and toxic substances, psychological
stress and lifestyle risks. Also, measures should be
focused on improving the first-aid education of crews,
and the optimization of medical care as well as the
hygiene conditions on vessels. Additionally, long
separation from families, long working hours and
communication problems owing to different shipboard
languages are all promoters of fatigue and isolation and
should be minimized.
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