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Muscle Tone in Space (Myotones)
Principal Investigator
Research Area:
Muscle physiology
Species Studied
Scientific Name: Homo sapiens Species: Human

Investigators aim to access microgravity-induced biomechanical muscle parameters such as tone, tension, elasticity, relaxation, and creep on the relaxed muscles of the human body by means of the non-invasive MyotonPROTM device to access skeletal muscle status for better health monitoring of crewmembers during preflight training, inflight activities, and post-flight reconditioning.

This study has the following specific aims:

  1. To better understand the fundamental adaptation mechanisms related to the yet ill-defined structure-function-biomechanics interrelations of the human resting myofascial system exposed to long-term continuous microgravity.
  2. To gain a better and more comprehensive evaluation of the crewmembers performance control and fitness for variable mission duties (inflight monitoring).
  3. To perform routine monitoring on crewmembers before launch and after landing.
  4. To monitor in relation to preflight data the magnitude of changes throughout the full cycle of deconditioning on the International Space Station (ISS) and post-flight reconditioning.
  5. To monitor on which level due to regular exercise the astronauts will be able to maintain and even up the parameters measured by the MyotonPROTM on Earth versus the ISS.
  6. To monitor the microgravity changes of different tissue and muscle types.

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Muscle relaxation

Photo Gallery
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Data Information
Data Availability
Archiving in progress. Data is not yet available for this experiment.

Gastrocnemius muscle size
Muscle creep
Muscle elasticity
Muscle tone
Tibialis anterior

Mission/Study Information
Mission Launch/Start Date Landing/End Date Duration
Expedition 56 06/03/2018 10/04/2018 123 days
Expedition 57 10/04/2018 12/20/2018 77 days
Expedition 59 03/14/2019 06/24/2019 102 days
Expedition 60 06/24/2019 10/03/2019 101 days
Expedition 61 10/03/2019 02/06/2020 126 days
Expedition 62 02/06/2020 04/17/2020 70 days
Expedition 63 04/17/2020 10/21/2020 187 days
Expedition 64 10/21/2020 04/16/2021 177 days
Expedition 65 04/16/2021 10/17/2021 184 days
Expedition 66 10/17/2021 03/30/2022 164 days

Additional Information
Managing NASA Center
Johnson Space Center (JSC)
Responsible NASA Representative
Johnson Space Center LSDA Office
Project Manager: Jessica Keune
Institutional Support
European Space Agency (ESA)
Proposal Date
Proposal Source