Military Hygiene and Hygiene in Emergency Situations - K.O. Pashka 2005

Occupational hygiene of military personnel during the mitigation of emergency consequences and in wartime
Specifics of work in space facilities

The ecological system formed within the hermetically sealed cabin of a spacecraft closely mirrors Earth's living conditions in every respect, yet it possesses A number of distinct features. These arise from the necessity to artificially create a gaseous environment from abiotic components (generating oxygen, removing carbon dioxide, and eliminating harmful chemical impurities) alongside the presence of two biological components within this system: humans and microorganisms. This latter circumstance introduces a degree of instability to the ecosystem, as alterations in any single link lead to a disruption of the system as a whole.

During spaceflight, astronauts experience weightlessness, which triggers pronounced functional changes across a range of body systems and Organs. Operating complex and diverse tasks in space exposes their bodies to a compounded set of environmental factors. Studies have established that replicating familiar terrestrial conditions in sealed environments—including the opportunity to perform Sanitary and hygienic Procedures on board spacecraft, such as washing and taking showers—largely ensures reliable and productive performance by crew members.

Complex Ecological and Physiological interactions between humans and their living environment dictate the fundamental patterns governing The formation of the atmosphere in sealed compartments. Research has shown that the level of air pollution caused by anthropogenic volatile metabolites depends primarily on Temperature and humidity parameters, dietary habits, and the individual's level of physical activity. It has been proven that an altered gaseous composition shortens the potential duration of human occupancy and adversely affects performance capacity.

Space hygiene specialists investigating human well-being within hermetically sealed habitats have determined that individuals experience significant strain on their physiological adaptation reserves, driven primarily by psychological stress and, to a lesser extent, by noise, the cumulative impact of chemical pollutants, cosmic radiation, and elevated environmental ionization.

The artificially engineered living environments within various sealed facilities are highly dynamic. In certain cases, standard system malfunctions (such as failures in the air regeneration system, fluid leaks, or temperature control disruptions) can cause substantial deviations of environmental parameters from their average values. This must be taken into account when evaluating the suitability of such artificial environments for human habitation, alongside anticipating potential emergency scenarios—such as a decrease in oxygen content and an increase in carbon dioxide concentration within closed compartments of a submarine, aircraft, or spacecraft, which can induce acute Hypoxia and hypocapnia in crew members.

Studies have demonstrated that the aforementioned spaceflight factors can adversely affect human immune resistance, particularly the T-Cell immune system. The weakening of immunobiological defenses leads to heightened activity of infectious agents, including the body's own indigenous microflora. Bacteria harboring extrachromosomal (plasmid-mediated) drug resistance become potentially hazardous to astronauts, thereby diminishing or entirely neutralizing the efficacy of antibacterial agents. Consequently, infectious processes—often accompanied by an allergic component—frequently assume a protracted course and prove virtually refractory to standard therapeutic Methods.

The absence of solar radiation presents another hygienic challenge that requires resolution during long-duration spaceflights. Insufficient ultraviolet exposure triggers a cascade of physiological changes that ultimately reduce the astronaut's overall resistance and, consequently, their performance capacity.

The Challenge of ensuring the survival of spacecraft crews following landing or ditching in remote areas necessitates the development and refinement of numerous emergency survival gear components, tailored to potential environmental hazards to facilitate and accelerate search and rescue operations.

Rational Nutrition is paramount for sustaining normal physiological Functions and high operational performance among astronauts during long-duration space missions. The primary requirements for their dietary rations include: adequacy in caloric content relative to Energy Expenditure, along with a sufficient and well-balanced supply of Proteins, fats, CARBOHYDRATES, minerals, Vitamins, and dietary fiber.

Food packaging for astronauts must satisfy several critical requirements, including The ability to consume its contents under weightlessness, resilience against mechanical stress and temperature fluctuations, and stability regarding dimensional and mass characteristics.

Long-term human presence aboard orbital space stations is feasible only through the utilization of Water reclaimed via a regenerative water supply system (WSS) Processing human metabolic byproducts or moisture-containing technical waste. One of the key Methods for Enhancing the hygienic reliability of the WSS involves conducting in-flight operational quality control of the purified water based on specific parameters.

Thus, the challenge of maintaining the habitat environment within hermetically sealed spacecraft compartments can be broadly defined by several practically significant issues: sustaining the gaseous composition, microclimatic parameters, and consistent sanitary-bacteriological conditions; providing astronauts with water and food; and ensuring personal hygiene alongside adequate sanitary and domestic support.