Anthropometric Changes in Spaceflight.

Area of Science:

• Spaceflight physiology
• Human factors in aerospace
• Biomedical engineering

Background:

• Accurate anthropometric measurements are essential for understanding microgravity-induced body changes.
• Limited anthropometric data from astronauts in space has hindered design efforts.

Purpose of the Study:

• To identify and quantify anthropometric measurement changes in astronauts during spaceflight.
• To provide crucial data for the design of spacesuits and hardware.

Main Methods:

• Utilized a novel photogrammetry technique combined with tape measurements.
• Collected data on body segment circumferences and heights from nine International Space Station crewmembers.
• Assessed time-dependent variations across pre-flight, in-flight, and post-flight conditions.

Main Results:

• Stature increased up to 3% early in flight, then stabilized, returning to pre-flight levels post-flight.
• Chest, hip, thigh, and calf circumferences decreased by up to 11% during flight, returning near pre-flight values post-flight.
• Similar trends were observed for other linear measurements like acromion height.

Conclusions:

• The study provides critical anthropometric data for optimizing spacesuit and hardware design.
• Ground-based assessments for spacesuit fit require revalidation using in-flight data.
• Findings are applicable to habitat, vehicle design, and human factors in microgravity activities.