| 摘要 |
A dumbbell includes a dumbbell body and an instrument, the instrument having a main unit fixedly mounted on the surface of the dumbbell body and sensor means fixedly mounted on the dumbbell body and electrically connected to the main unit, wherein the sensor means detects the number of cycles within which the operator moves the dumbbell body up and down as well as the heart beat of the operator for enabling the main unit to calculate the amount of heat energy consumed by the operator during exercising when the operator presses the thumb on the sensor means.
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