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Concurrent exercise on a gravity-independent device during simulated microgravity.

Joshua A Cotter1, Alvin Yu, Fadia Haddad

  • 11Department of Physiology and Biophysics, University of California, Irvine, CA; 2Department of Orthopaedic Surgery, University of California, Irvine, CA; 3Department of Kinesiology, California State University, Long Beach, CA; and 4Department of Physiology and Pharmacology, Karolinska Institute, Stockholm, SWEDEN.

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High-intensity exercise using a gravity-independent device effectively maintained muscle function and aerobic capacity during simulated microgravity (unilateral lower limb suspension). This training mitigated muscle loss and improved performance markers.

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Area of Science:

  • Exercise Physiology
  • Space Medicine
  • Skeletal Muscle Biology

Background:

  • Short-term unilateral lower limb suspension (ULLS) simulates microgravity effects, leading to skeletal muscle deconditioning and reduced aerobic capacity.
  • Maintaining physical function is crucial for astronauts during space missions and for rehabilitation after injury.

Purpose of the Study:

  • To investigate the efficacy of a high-intensity concurrent training program using a novel gravity-independent device.
  • To assess the impact of this training on skeletal muscle function and aerobic capacity during a 10-day ULLS protocol.

Main Methods:

  • Nineteen participants underwent 10 days of either ULLS only or ULLS combined with exercise (ULLS + EX).
  • The ULLS + EX group utilized a Multi-Mode Exercise Device (M-MED) for alternating high-intensity aerobic and resistance training sessions.
  • Muscle function, aerobic capacity, and molecular markers (myosin heavy-chain mRNA, myostatin, atrogin, citrate synthase) were analyzed.

Main Results:

  • The ULLS + EX group showed a 7% increase in aerobic capacity and improved strength in knee extensors and ankle plantar flexors.
  • Peak torque decreased with ULLS but was maintained or improved with ULLS + EX.
  • Molecular changes associated with muscle atrophy (myostatin, atrogin) were mitigated in the vastus lateralis with ULLS + EX.

Conclusions:

  • A gravity-independent exercise device (M-MED) can effectively counteract the deconditioning effects of simulated microgravity.
  • High-intensity concurrent training is a viable countermeasure for preserving skeletal muscle function and aerobic capacity during ULLS.