INTRODUCTION Environmental motion can affect shipboard sleep of crewmembers. Slamming and similar harsh motion may interfere with sleep, whereas mild motion and sopite syndrome may enhance sleep. If sleep needs vary by sea condition, this factor should be considered when assessing human performance at sea. The goal of this study was to assess sleep duration in different sea conditions. METHOD...

Motion sickness in rodents could be induced with vestibular stimulation from rotation [1]. However, rats and mice could not nauseate and vomit due to the powerful barrier between the stomach and the esophagus [2]. Instead, they exhibit pica behavior (eating of kaolin), which has already been thought as an alternative to nausea and vomiting in rats [3]. Nonetheless, no significant increase in ka...

Motions sickness (MS) occurs when the brain receives conflicting sensory signals from vestibular, visual and proprioceptive systems about a person’s ongoing position and/or motion in relation to space. MS is typified by symptoms such as nausea emesis implicates complex physiological aspects of sensations sensorimotor reflexes. Use animal models has been integral unraveling causality MS. The com...

Motion sickness in self-driving cars is a key human factor that aggravates the passengers’ health autonomous vehicles and investigated following pages. As drivers turn into passengers dwell other activities, probability of car inevitable cars. Path planning could serve an important role reducing sickness. The present study establishes thresholds contribute to motion from vehicle’s dynamic point...

Intramuscular (i.m.) injections of promethazine in 25 mg or 50 mg dosages are commonly used to treat space motion sickness in astronauts. The present study examined the effects of i.m. injections of promethazine on neuropsychological performance, mood states, and motion sickness tolerance in humans. Twelve men, mean age 36 _+3.1, participated in one training (no injections) and three treatment ...

The objectives of this study were to characterize the digestive tract motor and myoelectric responses associated with motion sickness. Twenty-two cats (1.5-3.0 kg) were chronically implanted with force transducers and electrodes on the stomach and small intestine. Motion sickness was activated by vertical oscillation (VO) at +/-0.5 g and identified as salivation, licking, or vomiting. Vomiting ...

Ginger has long been used as an alternative medication to prevent motion sickness. The mechanism of its action, however, is unknown. We hypothesize that ginger ameliorates the nausea associated with motion sickness by preventing the development of gastric dysrhythmias and the elevation of plasma vasopressin. Thirteen volunteers with a history of motion sickness underwent circular vection, durin...