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Related Concept Videos

Acceleration due to Gravity on Other Planets01:24

Acceleration due to Gravity on Other Planets

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Preparation:

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Updated: Jun 19, 2026

Comparative Analysis of Lower Limb Kinematics between the Initial and Terminal Phase of 5km Treadmill Running
08:26

Comparative Analysis of Lower Limb Kinematics between the Initial and Terminal Phase of 5km Treadmill Running

Published on: July 17, 2020

Lower limb position during treadmill jogging and fast running in microgravity.

Meghan E Everett1, Daniel P O'Connor, John K Dewitt

  • 1NASA Johnson Space Center, Houston, TX, USA. Meghan.e.everett@nasa.gov

Aviation, Space, and Environmental Medicine
|October 13, 2009
PubMed
Summary

Astronauts running on the International Space Station (ISS) treadmill showed different leg movements during jogging in microgravity compared to normal gravity. However, running at faster speeds demonstrated similar kinematics, suggesting potential benefits for in-flight exercise.

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06:35

Using Gold-standard Gait Analysis Methods to Assess Experience Effects on Lower-limb Mechanics During Moderate High-heeled Jogging and Running

Published on: September 14, 2017

Area of Science:

  • Space physiology
  • Exercise countermeasures
  • Biomechanics

Background:

  • The second-generation ISS treadmill allows for faster speeds than the current model.
  • Locomotion speed in normal gravity (1 G) correlates with bone loading benefits and cardiorespiratory stress.
  • Understanding microgravity locomotion kinematics is crucial for evaluating exercise efficacy.

Purpose of the Study:

  • To compare the kinematics of treadmill locomotion between 1 G and microgravity.
  • To evaluate the potential of fast running as an in-flight exercise countermeasure.

Main Methods:

  • Subjects (N=11) performed treadmill exercise at two speeds (3.13 m/s and 5.36 m/s) in both microgravity (parabolic flight) and 1 G.
  • Microgravity trials utilized a subject loading system simulating approximately 80% bodyweight.
  • Kinematic analysis focused on joint positions at heel strike using video software.

Main Results:

  • During jogging (3.13 m/s), significant differences in thigh and knee angles were observed in microgravity, indicating a more squatted posture at heel strike.
  • No significant kinematic differences were found between microgravity and 1 G during the faster running (5.36 m/s) condition.
  • These findings suggest altered biomechanics during slower-paced locomotion in microgravity.

Conclusions:

  • The subject loading system and reduced external load in microgravity likely contribute to altered jogging kinematics.
  • Kinematic compensations during microgravity jogging may lead to different in-flight adaptations compared to 1-G training.
  • The similar kinematics during faster running suggest this intensity may offer comparable benefits to 1-G running for astronauts.