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Home » Science » Sunita Williams’ battle with bone loss as 9 day mission turned into 52 days

Sunita Williams’ battle with bone loss as 9 day mission turned into 52 days

NASA astronaut Sunita Williams and Barry Wilmore experienced delays in their return to Earth due to a helium leak in their spacecraft, the Starliner. This extension has exacerbated Williams’ battle with bone density loss. The delay underscores the complexities of space travel, highlighting both the technical issues and health challenges like fluid redistribution and increased radiation exposure

August 1, 2024
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NASA astronaut Sunita Williams, alongside Barry Wilmore, remains aboard the International Space Station (ISS) due to ongoing issues with their spacecraft. As per the recent reports Sunita Williams is undergoing a battle of bone loss as originally set to return on June 14, their return has been delayed to June 26, with potential for further postponements.

The spacecraft, a Starliner, encountered a helium leak in the service module—a crucial component for spacecraft operations—prompting the extended stay.

The absence of gravity leads to a rapid decrease in both muscle mass and bone density, resembling conditions like osteoporosis. For astronauts like Sunita Williams, this phenomenon is a major concern. Despite adhering to rigorous exercise regimes designed to counteract these effects, bone loss remains an inevitable consequence of prolonged space missions. In microgravity, bones no longer bear weight, causing them to lose density as they are not subjected to the same stresses they experience on Earth. This leads to the thinning of bone tissue, which can increase the risk of fractures. Williams’ extended stay in space has exacerbated these issues, with her bone density potentially decreasing at a rate faster than on Earth.

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The delay stems from a helium leak detected in the spacecraft’s service module. The Starliner, which docked at the ISS on June 6, was initially scheduled for a return in mid-June. However, the malfunction necessitated an extended mission. This technical hiccup not only affects the astronauts’ schedules but also highlights the complexities and unforeseen challenges of space travel.

Health effects of microgravity

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Microgravity presents several health challenges for astronauts, exacerbated by extended stays in space. One of the most significant issues is fluid redistribution, which results in facial puffiness and decreased fluid volume in the legs. These changes can disrupt cardiovascular function and complicate blood pressure regulation upon returning to Earth.

Mitigation strategies and research

NASA has implemented various strategies to address bone loss, including specialised exercise regimens and nutritional interventions. Astronauts perform resistance and aerobic exercises to help maintain bone density. Additionally, research is ongoing to develop more effective countermeasures, such as pharmacological treatments and advanced exercise protocols.

Urinary system impact

Microgravity also affects the urinary system. Fluid shifts and altered metabolism increase the risk of kidney stones due to elevated calcium levels in urine. Hormonal changes and shifts in gut microbiota further complicate nutrient absorption and overall health, necessitating ongoing medical monitoring and preventive measures.

Sensory and balance adjustments

Astronauts in microgravity experience changes in spatial orientation, balance, and coordination. Space Motion Sickness (SMS) is common initially but usually resolves as astronauts adapt. Adjustments to these changes are crucial for maintaining daily function and operational efficiency in space.

Visual impairments

Prolonged missions can lead to visual impairments, including hyperopic shift and optic disc edema. These conditions are linked to changes in intracranial pressure and fluid distribution in the brain and eyes. Ongoing research aims to understand these mechanisms better and develop solutions to mitigate their impact.

Radiation exposure risks

Space missions expose astronauts to higher radiation levels than on Earth, increasing the risk of DNA damage and cancer.

Tags: AstronautBarry WilmoreNASASunita Williams
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