Bone loss and kidney stone risk in weightlessness

Area of Science:

• Space medicine
• Bone and mineral metabolism
• Renal physiology

Background:

• Spaceflight, particularly weightlessness, accelerates bone loss and increases kidney stone formation risk.
• The International Space Station (ISS) utilizes extensive exercise equipment for countermeasures, but future missions will involve smaller spacecraft with limited capacity.
• This transition necessitates novel strategies to mitigate health risks associated with prolonged space travel.

Approach:

• This review examines the risks of bone loss and kidney stones in the context of evolving space exploration.
• It explores the need for novel, low-resource monitoring and intervention strategies.

Key Points:

• Future missions will utilize smaller spacecraft with limited capacity for exercise equipment.
• Monitoring urinary calcium concentration is a promising, low-resource method to assess kidney stone risk.
• Targeted countermeasures, such as bisphosphonates, can be administered to individuals with high-risk indicators.

Conclusions:

• A shift from generalized exercise to personalized monitoring and targeted countermeasures is essential for future space exploration.
• Urinary calcium monitoring offers a promising biomarker for identifying astronauts susceptible to kidney stone formation.
• Efficient and individualized countermeasure strategies are crucial for maintaining astronaut health during extended missions in reduced-volume spacecraft.