Revealing the Surprising Truth: How Microgravity Elevates Core Body Temperature in the IIST Model
In February 2023, the Voyager 1 spacecraft reached a staggering 25 billion kilometers from Earth, marking it as the farthest human-made object in our solar system. As we look toward a future where human astronauts might embark on similar journeys, the longevity of such missions hinges on understanding how space affects the human body. A critical aspect is thermoregulation—the body’s ability to maintain a stable internal temperature—especially in the unique microgravity environment of space.
Researchers at the Indian Institute of Space Science and Technology (IIST) in Thiruvananthapuram have made significant strides in this area. According to Shine S.R., a professor of aerospace engineering and co-author of a recent study, their findings indicate that microgravity consistently raises core body temperature, with fluid shifts playing a pivotal role in thermal balance. The human body reacts differently to temperature fluctuations based on various factors, including age, fitness level, and body composition. In nearly weightless conditions, bodily changes can severely impact bones, muscles, and even cellular functions, prompting space agencies to closely monitor astronauts’ body temperatures during missions.
The IIST team has developed a sophisticated 3D computational model to simulate how microgravity affects human thermoregulation. “This model incorporates physiological changes observed in space, such as blood shifts and metabolic variations,” Shine noted. By accounting for different factors influencing thermoregulation—including heat generated by vital organs, sweating, and clothing—the team aims to accurately predict temperature regulation in astronauts.
Chithramol M.K., a PhD student and lead author of the study, highlighted that their research faced limitations related to data availability on metabolic changes. In instances where data was sparse, the team utilized their best judgement, guided by standard engineering practices, to assess their model’s accuracy. Their computational approach uses mathematical equations to track heat movement through the body, revealing how microgravity affects bodily temperature distribution. Findings suggest that, as astronauts spend more time in microgravity, their extremities cool down while their core temperature rises.
Moreover, when exercising in space, astronauts may experience a more rapid increase in body temperature compared to analogous activities on Earth. For instance, a study showed that a core temperature could rise from 36.3°C to around 37.8°C over 2.5 months in microgravity, with exercise potentially pushing it to nearly 40°C. The IIST team validated their model by simulating data from the Mir space station and the International Space Station, successfully matching their predictions to official reports.
Interestingly, many existing thermoregulation models primarily rely on data from non-Indian populations, which can lead to inaccuracies when applied to different demographic groups. By developing a model tailored to Indian physiology, the researchers hope to enhance predictions related to temperature regulation.
The implications of this research extend beyond space travel. Thermoregulation models inform various real-world applications, from clothing design to architecture, even influencing patient care during medical procedures. Shine emphasized that, while their model was built with astronauts in mind, its potential extends into everyday scenarios that enhance safety, comfort, and performance.
With the ongoing evolution of space exploration, understanding the intricacies of human thermoregulation in microgravity is crucial. The findings from IIST not only pave the way for safer astronaut experiences but also contribute valuable insights applicable to numerous terrestrial situations.
Original Source: https://www.thehindu.com/sci-tech/science/microgravity-increases-core-body-temperature-iist-model/article69501348.ece
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Publish Date: 2025-05-04 07:00:00
