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When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
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Updated: Aug 30, 2025

Mimicking a Space Mission to Mars Using Hindlimb Unloading and Partial Weight Bearing in Rats
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Sensitivity Analysis for Multidirectional Spaceflight Loading and Muscle Deconditioning on Astronaut Response.

Mitesh Lalwala1,2, Karan S Devane1,2, Bharath Koya1,2

  • 1Department of Biomedical Engineering, Wake Forest University School of Medicine, 575 N. Patterson Ave, Suite 530, Winston-Salem, NC, 27101, USA.

Annals of Biomedical Engineering
|August 26, 2022
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Summary

Astronauts

Keywords:
Active model validationBiomechanicsBracingDirection sensitivityFinite element modelingGlobal Human Body Models Consortium (GHBMC)Injury riskM50-OS+DeformSpine modelMuscle PCSAResponse time

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Area of Science:

  • Biomechanics
  • Spaceflight Physiology
  • Human Body Modeling

Background:

  • Spaceflight exposes astronauts to transient accelerations.
  • Understanding human response to these forces is critical for crew safety.
  • Existing models require validation for spaceflight-specific loading conditions.

Purpose of the Study:

  • To perform a sensitivity analysis on astronaut response to spaceflight transient accelerations.
  • To evaluate the impact of loading conditions and muscle deconditioning on injury risk.
  • To identify key factors influencing astronaut safety during acceleration events.

Main Methods:

  • Utilized a mid-size male human body model with active musculature.
  • Validated the model against volunteer tests (2.5-15 g) for biofidelity (CORA: 0.69).
  • Conducted 600 simulations varying pulse magnitude, rise time, direction, muscle size, and responsiveness.

Main Results:

  • Loading direction was the most significant factor (50% variance) affecting injury metrics.
  • Pulse magnitude also significantly impacted injury metrics (16%).
  • Muscle size changes had minimal effect (0.2%), while responsiveness (3%) and rise time (2%) had slight effects.

Conclusions:

  • Loading direction and magnitude are primary determinants of astronaut injury risk during transient accelerations.
  • Frontal/upward and rear/downward directions pose the greatest risk to specific body regions.
  • Muscle pre-bracing and higher pulse magnitudes increase overall injury risk, highlighting the need for protective measures.