Patent ID: 7034694

Claim:
A body motion detector for use with a user, comprising: a body motion detecting device to detect body motion accompanying repetitive motion of the user; a determining device to determine whether an amplitude value of a detection result of the body motion detecting device is within a predetermined reference range, the detection result being either the motion intensity and accumulated motion frequency of the repetitive motion or the motion intensity, motion period, and accumulated motion frequency of the repetitive motion, and the predetermined reference range for the motion intensity and the motion period being either above the lower limit reference value set by the user or between the lower limit reference value and the upper limit reference value, which are set by the user, and the predetermined reference range for the accumulated motion frequency being below an accumulated target frequency set by the user; a rectangular wave converting circuit that converts the detection result only when the amplitude value is within the predetermined reference range; and a notifying device to generate a notifying signal whenever a determination result by the determining device is within the predetermined reference range.