Inflatable exercise device
An inflatable unitary construction hemispherical or dome-shaped flat-bottomed exercise device analogous to an exercise ball having a flat and relatively stable surface to improve its usefulness to people who cannot control fully round prior art exercise balls.
This invention relates to exercise equipment. More particularly, this invention relates to air-filled exercise devices that are used to work various muscle groups and to promote core stability.
BACKGROUND OF THE INVENTIONPrior exercise balls are relatively large-diameter (12-42 inches) air-filled balls that are sufficiently strong to support a person's body weight retaining a generally spherical shape.
Exercise balls are useful to target specific muscle groups. Sit-ups and other abdominal exercises can be much more effective when they're done using an exercise ball. Limited research in the scientific literature suggests that exercise training on an unstable surface results in increased muscle activity, as a means to provide stability to the system (human body) during an exercise.
A problem with prior art exercise balls is that they tend to roll and wobble during exercise. Indeed, the prior art exercise ball's tendency to pitch and roll makes exercises that are performed with an exercise ball more challenging because the ball's tendency to pitch and roll requires the person using the ball to provide more muscle control (to control the ball's movement as well as the exercise being performed) than would be required to perform the same exercise on a flat surface. For people who need or who want the more focused muscle work provided by an exercise ball, but who are unable to control the pitching and rolling of a prior art exercise bal, there exists a need to provide an exercise device that reduces or eliminates roll.
Prior dome-shaped inflatable balance trainers, such as the BOSU® balance trainer, have hard plastic bases and tend to be large and heavy, weighing upward of 14 lbs. These devices are not designed to fit comfortably between the user and the floor when the user is in a substantially supine position.
SUMMARY OF THE INVENTIONThere is provided an air-filled, hemi-spherically shaped exercise device that reduces or eliminates pitching and rolling of prior art round exercise balls. Because the device is hemispherical, the flat surface of the device that is placed on the floor, reduces or even eliminates excessive pitching and rolling that some prior art devices cause. In addition, the unitary construction of the present invention provide the limited additional instability of a distended base under load, while maintaining a low profile for ease of use and storage.
BRIEF DESCRIPTION OF THE DRAWINGSFor the sake of brevity, like elements are denoted by the same reference numerals throughout the disclosure.
As shown in
In one embodiment, the flexible bladder is made from a flexible polymer or vulcanized rubber. In another embodiment, the flexible bladder is made from a relatively thin poly vinyl chloride or “PVC.” A preferred embodiment uses PVC, the thickness of which is approximately 2-3 mm.
By using thin, lightweight flexible materials, the exercise device's weight can be kept to less than approximately 1200 g. (1.2 Kg.) thereby allowing the device to be easily moved and stored.
In a preferred embodiment, the hemisphere-shaped exercise device 10 shown in
Referring now to
In
As shown in
A goal of muscle strengthening is to move freely through a full range of motion, and the present invention allows for a greater range of motion at the trunk, with subsequent greater muscle activity during a repetition. Use of this device resulted in an exercise that required greater trunk range of motion and greater muscle activity in the rectus abdominus (upper portion) and external oblique muscle. Several factors appear to contribute to the greater muscle activity measured with this device compared with a traditional floor exercise.
The device allows a user to work through a greater range of motion. Thus, the muscles of the motion are required to work over a greater range of muscle action. Because of this greater range of motion, the muscles of the anterior trunk are engaged with the trunk in an extended position (beginning of crunch exercise) as well as a flexed position (end of crunch exercise; i.e., the curled-up position). The extended position is performed with the center of mass of the upper body at a greater distance from the axis of rotation (the pelvis); hence the external effort arm is greater during the early phase of the crunch exercise. As the crunch motion continues, the center of mass of the upper body moves closer to the axis of rotation (pelvis), resulting in a decrease in the external effort arm. The device positions the trunk in a more extended position, lengthening the overall external moment arm more so than the traditional floor exercise.
It will be apparent to those of ordinary skill in the art that various modifications can be made to the device 10 described above without departing from the spirit of the present invention. The scope of the invention is as recited in the appended claims.
Claims
1. An exercise device comprised of:
- a flexible bladder, sized, shaped and arranged to take the form of a hemisphere when the flexible bladder is at least partially filled with air, the substantially hemispheric bladder having a substantially flat surface for placement onto a floor or other flat surface.
2. The device of claim 1, wherein the flexible bladder is further comprised of at least one inflation valve for filling the bladder with air or other gas.
3. The device of claim 1, wherein the flexible bladder is made of a polymeric substance or a vulcanized rubber material.
4. The device of claim 1, wherein the flexible bladder is poly vinyl chloride (PVC).
5. The device of claim 4, wherein the PVC is approximately 2 mm thick.
6. The device of claim 1, wherein the device weighs less than 1200 g.
7. The device of claim 1, wherein the interior radius of the inflated and unloaded hemisphere is less than 6 inches.
8. The device of claim 1, wherein the diameter of the flat surface of the device is less than 17 inches.
Type: Application
Filed: Dec 30, 2005
Publication Date: Jul 5, 2007
Inventors: Brenda Dykgraaf (Orlando, FL), William Cameron (Windermere, FL)
Application Number: 11/323,777
International Classification: A63B 26/00 (20060101); A63B 71/00 (20060101);