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There are different theories cited as the cause of Motion Sickness. Asymmetrical otolithic organ function is one of the etiology theories of motion sickness. In our study, the aim was to reveal whether there is a cause originating from the sacculocolic reflex pathway in the physiopathology of seasickness. The patient group included 15 man sailors with diagnosis of seasickness and the control group included 15 man sailors without seasickness in our study. Cervical evoked myogenic vestibular potential (cVEMP) findings were compared between the groups. In the right and left ears of sailors with seasickness, the mean latencies of the p13 and n23 waves at 100, 95, and 90 dB normal hearing level (nHL) levels were found significantly shorter than in the control group (p < 0.05, for all). In the seasickness group, cVEMP interaural wave amplitude asymmetry ratio at 100 nHL level were found significantly higher than the control group (p = 0.001). The findings of our study indicated that there may be reasons arising rom the sacculocolic reflex pathway in the pathophysiology of seasickness. [ABSTRACT FROM AUTHOR]

Disorders related to labyrinth irritation (kinetosis) constitute a significant problem in sea travel, especially in sea service. A team of military researchers conducted research on a very large group (over 200 people) regarding the possibility of preventing seasickness through physical training. An original set of exercises was developed and performed by the study group. Then, the sensitivity of the test group and the control group to rocking was checked in laboratory and real conditions (sea cruise). The method has been shown to be over 50% effective in preventing and alleviating the symptoms of seasickness. The use of selected physical exercises may be an effective training against the risk of kinetosis. [ABSTRACT FROM AUTHOR]

Human passive motion during boat, car or airplane travel may trigger motion sickness. Seasickness is the most provoking manifestation of motion sickness. It imposes major constraints on quality of life and human performance. Based on seasickness susceptibility the population is usually categorized into susceptible (S) and non-susceptible (NS). During repeated exposure some susceptible individuals undergo habituation and obtain symptoms relief, reflecting a third group of habituating (H) individuals. Recently, accumulative evidence suggests that the vestibular time constant (Tc) is associated with motion sickness susceptibility and attenuation of symptoms. These studies demonstrated that repeated passive motion stimuli lead to temporary short-term (days) changes in Tc, whereas sea sickness habituation process lasts 3 to 6 months. Therefore, the goal of the present study was to examine the behavior of Tc during the entire span of the seasickness habituation process between the H, S and NS groups to find an objective test for seasickness severity prediction. Tc of 30 subjects was prospectively evaluated pre, 3 and 6 months post exposure to sea environment using a computerized rotatory chair system protocol. Seasickness severity was evaluated by Wiker questionnaire. Significantly shorter Tc was found in the S group compared with the NS and H groups. Further analysis revealed lower maximal Slow Phase Velocity (mSPV) and nystagmus frequency (total number of beats/second) in the S group. Our results suggest that Tc, mSPV and nystagmus frequency might serve as a prediction for seasickness severity. This study was retrospectively registered on December 7th 2022 and assigned the identifier number NCT05640258. [ABSTRACT FROM AUTHOR]

Thresholds that guide diagnoses of probable and acceptable seasickness levels on board ships are scarcely reported in literature. Motion sickness incidence and motion sickness dose value thresholds exist, but are defined for specific environments, such as naval, or offered merely as optional criteria for ship performance metrics. The presented work communicates a novel means of developing seasickness diagnostic criteria during ship operation, based on observations from shipboard measurement systems and seafarers using an innovative platform. The innovative platform provides personalised seasickness criteria that are accessible during ship operation to estimate the probable level of seasickness on board. Results are compared to that from a traditional method of data acquisition and analyses, post operation, revealing a similar trend in diagnostic threshold magnitudes (13–85 m/s1.5) that can be applicable to voyages with different durations (0.5–6 hr) considering desired levels of seasickness (10–50 %). The seasickness criteria are envisioned to be pertinent for the prediction of probable seasickness levels based on sea state forecasts and ship motion estimation. [ABSTRACT FROM AUTHOR]

Background: Motion sickness, is the onset of a series of clinical signs when travelling in a means of locomotion. Boats are the most common source of kinetosis, causing seasickness. Although this condition is often benign, it can severely affect the quality of life of seafarers, as well as the quality of their work. The aim of this study is to focus on the point prevalence and characteristics of seasickness in a population of French civilian seafarers from all shipping sectors., Materials and Methods: During two months in 2023, we conducted a cross-sectional study based on a questionnaire containing 28 questions., Results: One hundred nine men and 10 women completed the questionnaire. Of these, 34% said they were seasick. The main symptoms described by the sailors were nausea and cold sweats in 87.5% and 50% of cases, respectively. The prevalence of naupathy appears to be higher in women (60% compared with 31% in men). Women also seem to be less accustomed to the marine environment than men, with 71% of men and only 33% of women indicating that they get accustomed to life at sea. However, the symptoms of seasickness seem to disappear more slowly in men than in women. In terms of treatment, men (38%) were more likely to take medication than women (17%)., Conclusions: Our study shows a greater susceptibility to seasickness among women. This interpretation should be treated with caution given the small number of women who took part in the study. The relatively low point prevalence of seasickness (34%) could be due to under-reporting. Although ways of thinking are changing, seasickness is still a taboo subject for many sailors. Yet seasickness has major professional and personal repercussions. So it's important to raise the subject and discuss strategies for improving well-being at work.