Controlled force exercise system


Specifically ideated to counteract the effects of muscle atrophy, decreased bone mineral density, and reduced aerobic capacity due to a long permanence in space (e.g. the International Space Station), this exercise machine is capable of providing both resistance ad aerobic exercise in a compact, lightweight and reconfigurable design, with self-contained power generation.


A prototype was built for NASA and successfully tested at Wyle Laboratories in Houston, TX, where personnel from JSC and GRC had the opportunity to interact with the unit and provide valuable feedback.




The machine can simulate the biomechanics of free weight lifting, including inertial effects. It can also produce eccentric overload, which is a unique feature not provided by other gym systems currently on the market.


The system is completely reconfigurable, allowing the user to achieve the desired resistance during exercise, and it is designed to fold for easy storage.


Recommended uses


  • Controlled resistance exercise for athletic training,
  • Neuromuscular rehabilitation (stroke, spinal cord injury),
  • In-home personal training and physical therapy with telepresence of recorded exercise session parameters,
  • Interface to home gaming devices (e.g. Wii Tour de France).





  • Foldable for compact storage,
  • Supports both controlled resistance mode and aerobic exercise mode,
  • The resistance exercise mode load can be precisely controlled to the value desired by the user,
  • Inertia is accounted for to simulate free weight lift,
  • Eccentric overload can be applied and controlled by the user,
  • Demonstrated power generation in aerobic exercise mode,
  • High strength Technora-based cord (T-100).



  • Volume: 1.83 cu.ft. folded,
  • Weight: 55lb.,
  • System design load: 600lb.,
  • Maximum power consumption: 500W,
  • Power output in aerobic exercise mode: 30-70W (depending on peddling cadence).