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Related Experiment Videos

Gravity replacement during running in simulated microgravity.

Kerim O Genc1, Vince E Mandes, Peter R Cavanagh

  • 1Department of Biomedical Engineering, The Cleveland Clinic, Cleveland, OH 44195, USA. genck@ccf.org

Aviation, Space, and Environmental Medicine
|November 8, 2006
PubMed
Summary
This summary is machine-generated.

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Running in space with a new harness system can generate 1-g-like forces, crucial for preventing bone and muscle loss. This system offers comfort and effective countermeasures for astronauts during long-duration spaceflight.

Area of Science:

  • Spaceflight physiology
  • Exercise countermeasures
  • Musculoskeletal health

Background:

  • Treadmill exercise on the International Space Station (ISS) uses a subject load device (SLD) and harness to simulate gravity.
  • This system's ability to provide 1-g-like forces is vital for counteracting musculoskeletal changes during prolonged spaceflight.
  • A new SLD and harness system aims for more even load distribution between waist and shoulders.

Purpose of the Study:

  • To evaluate the comfort and function of the ISS harness with a new SLD in simulated microgravity.
  • To determine if the system can generate 1-g-like ground reaction forces (GRFs) during running.

Main Methods:

  • 12 subjects completed 5-minute running trials in a zero-gravity locomotion simulator.
  • Three subject load device (SLD) loads (50%, 75%, 100% bodyweight) were tested at a 50:50 shoulder-to-waist ratio.

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  • Subjective discomfort ratings, GRFs, and SLD loads were recorded.

    • Main Results:

    • A 100% bodyweight (BW) load produced GRF profiles comparable to 1-g overground running.
    • This 100% BW load was comfortably tolerated, with a mean Borg scale rating of 3.9/10.
    • The system allowed for even load distribution.

    Conclusions:

    • 1-g-like GRF profiles can be achieved during simulated microgravity running with the tested harness and SLD system.
    • These forces can be generated with acceptable comfort levels, rated better than "somewhat uncomfortable."
    • Running with 1-g loads is a potentially effective musculoskeletal countermeasure for long-duration spaceflight.