Increasing seated reaction forces with lower body negative pressure

TL;DR

This study shows that applying lower body negative pressure while seated increases reaction forces safely, which could help simulate Earth-like posture in space.

Contribution

The study introduces seated LBNP as a safe method to simulate Earth-like seated posture in microgravity environments.

Findings

Reaction forces increased significantly with rising LBNP levels, doubling by 30 mmHg.

Cardiovascular parameters remained stable, indicating no acute hemodynamic risk.

Force generation was dependent on LBNP amplitude and waist cross-sectional area.

Abstract

This study evaluates reaction forces and cardiovascular responses during seated lower body negative pressure (LBNP). Ten healthy subjects were exposed to randomized LBNP levels (−10 to −40 mmHg) while seated in a sealed chamber. Gluteal, foot, and total reaction forces, along with heart rate and blood pressure, were measured at each level. Reaction forces increased significantly with rising LBNP (P < 0.05), exceeding baseline at 10 mmHg and doubling by 30 mmHg. Cardiovascular parameters remained stable, indicating no acute hemodynamic risk. Force generation was dependent on LBNP amplitude and waist cross-sectional area. These findings suggest that seated LBNP is a safe and effective method to simulate Earth-like seated posture in microgravity, offering a promising countermeasure to mitigate musculoskeletal deconditioning and support gravitational adaptation during long-duration spaceflight.

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