| 摘要 |
A device for resistance exercise of muscle groups that cross two or more joints such as bicep group, tricep group, quadriceps group, and hamstring group. The device comprises a primary cam or gear fixed to the frame of an appropriate exercise machine for working the desired body part, and a secondary cam or gear which, when rotated, tracks around the primary cam or gear. Resistance is provided with a cable, belt, chain, or other means. When properly positioned user applies force to the contact point, the device moves both desired joints simultaneously through a range of motion while under a predictable resistance. The device provides an improved range of movement while under resistance, thereby supplying a greater extension and contraction of the desired muscle or muscle group than prior art devices.
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