Exercise devices – Sit up device
Patent
1996-06-10
1997-12-16
Apley, Richard J.
Exercise devices
Sit up device
482132, 482142, A63B 2302
Patent
active
056978740
ABSTRACT:
An abdominal exercise device is disclosed. The invention includes a pair of arm portions for the user to grasp, a head rest and support attached thereto, the support being attached to the arm portions, an extension portion extending from each arm portion and a curved radius on the other end thereof. The curved radius being received by a segmented track, the proximal end of the track being fixed to the extension portions such that when a person lies face up between the extension portions with their head on the head rest and pulls down on the arm portions, contracting the abdominal muscles and rolling the curved radius along the track picking up same, the abdominal muscles are worked and the instantaneous center of rotation of the articulating vertebrae are in proper alignment with the instantaneous rotation of the device. This guides the body in a proper sit up movement working the abdominal muscles while the head and neck are constantly supported by the head rest. A pelvis support can be fixed to the distal end of each of the tracks thereby offering and maintaining proper placement of the body to the machine, protecting the tail bone from injury from a hard floor and placing the pelvis in slight posterior rotation, reducing lower back stress during the movement.
REFERENCES:
patent: 5492520 (1996-02-01), Brown
patent: 5591111 (1997-01-01), Wang et al.
Paper The Basic Kinematics of the Human Spine; White, A.A., and Panjabi, M.M. Mar. 1978.
Brochure Fitness Quest (Abs of Steel), AB Sculptor and Keys Fitness Products (ABEX AbEx.)
Paper Low Back Pain and Subsequent Cardiovascular Mortality; Heliovaara, et. al. Sep. 1995.
Paper Modeling a Chiropractor:Population Ratio; Grier and Lepnurm Sep. 1995.
Paper Unconventional Medicine in the United States; Eisenberg, et. al. Jan. 1993.
Apley Richard J.
Clark Jeanne M.
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