Differential air pressure systems

1. A differential air pressure system comprising:

an inflatable chamber comprising a flexible user seal adapted to releasably seal about a portion of a user's body when the user is positioned inside the chamber;

a frame assembly having a base, wherein the inflatable chamber is attached to the base; and

a movable assembly comprising a seal frame attached to the chamber, a height adjustment bar attached to the seal frame, the height adjustment bar supported by a pair of adjustable posts wherein the movable assembly is configured to provide a vertical position adjustment of the height of the user seal by vertically moving the seal frame.

2. The system of claim 1 , wherein the inflatable chamber comprises an expanded orientation, a collapsed orientation, and a predetermined folding pattern transitioning the chamber from the expanded orientation to the collapsed orientation.

3. The system of claim 2 , wherein the predetermined folding pattern comprises a plurality of fold lines on the chamber, wherein the plurality of fold lines bias the chamber to fold into the collapsed orientation with alternating inward and outward folds.

4. The system of claim 2 , wherein the chamber comprises an embedded rod to facilitate inward folding of the chamber to the collapsed orientation.

5. The system of claim 2 , wherein the chamber comprises a layer of non-slip material on a portion of the chamber wherein the non-slip material is on a top surface of the chamber when the chamber is in a collapsed orientation.

6. The system of claim 5 , wherein when the chamber is in the collapsed orientation the top surface comprises a substantially flat surface for reducing a trip hazard to the user as the user steps onto the top surface and enters the user seal.

7. The system of claim 1 , wherein the chamber comprises two side panels coupled to a middle panel and the user seal is attached to the middle panel.

8. The system of claim 7 , wherein at least one of the of the side panels comprises a transparent window.

9. The system of claim 8 , wherein the transparent window comprises a fold line for outfolding the transparent window when the chamber is transitioned to a collapsed state.

10. The system of claim 1 , further comprising a seal between the base and the chamber.

11. The system of claim 1 , wherein the frame assembly comprises a pair of vertically oriented side posts and each side post partially houses a roller assembly.

12. The system of claim 11 , wherein the seal frame comprises a closed loop surrounding the user seal and the user seal is attached to the seal frame.

13. The system of claim 12 , wherein the closed loop is below the roller assembly.

14. The system of claim 1 , wherein the movable assembly further comprises a locking mechanism to engage with the frame assembly and fix the vertical position of the user seal.

15. A differential air pressure system comprising:

a pressurizable chamber comprising a user seal adapted to releasably seal about a portion of a user's body when the user is positioned inside the chamber;

a frame assembly having a base, wherein the chamber is sealed to the base; and

a seal frame comprising a loop structure proximal to the user seal, wherein a first portion of the loop structure adjacent to the user seal is positioned in a generally horizontal alignment with the user seal and a second portion of the loop structure is inclined relative to the first portion further comprising a height adjustment bar coupled to the second portion, the height adjustment bar configured to slide vertically along the frame assembly to adjust the height of the seal frame.

16. The system of claim 15 , wherein a portion of the seal frame constrains an area of the chamber adjacent to the user seal during pressurization of the chamber.

17. The system of claim 13 , wherein the user seal comprises a first seal component and a second seal component adapted to releasably couple and form a substantially airtight seal while the user seal is being worn by the user positioned inside the chamber.

18. The system of claim 13 , wherein one of the first seal component or second seal component is adapted and configured to be worn by the user.

19. The system of claim 18 further comprising an exercise device positioned inside the chamber in relation to the user seal to permit use of the exercise device by a user while wearing the first seal component or the second seal component.

20. A differential pressure system comprising:

an inflatable chamber having a deflated state and a predetermined expanded state; and

a frame assembly adjacent the chamber, the frame assembly comprising bars to limit the expansion of a front portion of the chamber and rails to limit a lateral expansion of a portion of the chamber when the chamber is inflated to the predetermined expanded state; and

a user seal at a top portion of the inflatable chamber, wherein the shape of the top portion in the predetermined expanded state is maintained by a seal frame adjacent to the user seal.

21. The system of claim 20 , wherein the seal frame comprises at least one structure configured to depress the top portion when the chamber is inflated.

22. The system of claim 20 , further comprising a height adjustment assembly for adjusting the height of the seal frame.

23. The system of claim 20 , wherein the user seal comprises a first seal component and a second seal component adapted to releasably couple and form a flexible waist seal around the user while a portion of the user's body is inside the chamber.

24. The system of claim 20 , further comprising an exercise device positioned inside the chamber.