AlterG Anti-Gravity Treadmill

AlterG Anti Gravity Treadmill in Wasilla, Alaska

Northern Edge Physical Therapy is the only physical therapy practice in the state of Alaska that offers clients excellence in physical therapy with specialized programs in AlterG Anti-gravity Treadmill

The Technology

AlterG’s technology was originally developed at NASA as part of an effort to help astronauts maintain fitness during prolonged space flight.  AlterG combined this technology with an advanced pressure regulation system and a treadmill to produce the first anti-gravity treadmill.  AlterG is the first company to use a pressurized enclosure to provide a counterforce to the person’s body weight, reducing their effective weight on the treadmill surface. The AlterG Anti-Gravity Treadmill has been cleared by the FDA as a medical device applicable for uses in rehabilitation after lower extremity injury or surgery, aerobic conditioning, weight control, gait training for neurological conditions, and strengthening and conditioning for older patients.  In addition, the AlterG Anti-Gravity Treadmill has seen overwhelming adoption as a training and conditioning tool that also reduces the risk of impact-related injuries while exercising.









The Benefits


  • Health and Medical:  The AlterG Anti-Gravity Treadmill is ideal for individuals recovering from lower extremity and spine injuries and surgeries and dealing with medical challenges that limit movement or impair mobility.
  • Injury Prevention:  With the AlterG Anti-Gravity Treadmill you’ll get the most out of your training or exercise programs while minimizing the risk of impact-related injuries and training without pain caused by chronic injury.
  • Training & Conditioning:  Use the AlterG Anti-Gravity Treadmill to augment training and conditioning routines, enhance performance, and allow individuals to continue working out during injury recovery.
Two videos referencing how patients have been using it with weight loss and Parkinson’s disease:


Lower body positive pressure (LBPP) treadmills permit significant unweighting of patients and have the potential to enhance recovery following lower limb surgery. We determined the efficacy of an LBPP treadmill in reducing knee forces in vivo. Subjects, implanted with custom electronic tibial prostheses to measure forces in the knee, were tested on a treadmill housed within a LBPP chamber. Tibiofemoral forces were monitored at treadmill speeds from 1.5mph (0.67m/s) to 4.5mph (2.01m/s), treadmill incline from -10° to +10°, and four treadmill chamber pressure settings adjusted to decrease net treadmill reaction force from 100% to 25% of the subject’s body weight (BW). The peak axial tibiofemoral force ranged from 5.1 times BW at a treadmill speed of 4.5mph (2.01m/s) and a pressure setting of 100% BW to 0.8 times BW at 1.5mph (0.67m/s) and a pressure setting of 25% BW. Peak knee forces were significantly correlated with walking speed and treadmill reaction force (R(2) =0.77, p=0.04). The LBPP treadmill might be an effective tool in the rehabilitation of patients following lower-extremity surgery. The strong correlation between tibiofemoral force and walking speed and treadmill reaction forces allows for more precisely achieving the target knee forces desired during early rehabilitation.

Anti-gravity treadmills are effective in reducing knee forces Patil S, Steklov N, Bugbee WD, Goldberg T, Colwell CW Jr, D’Lima DD. J Orthop Res. 2013 May;31(5):672-9.

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