PROBLEM TO BE SOLVED: To provide a technology to estimate a leg muscle strength value by a portable activity meter easily and simply, and to discriminate whether or not the estimated leg muscle strength value is appropriate for the age.;SOLUTION: An activity meter includes individual data input means for inputting individual data on a user, acceleration measuring means for outputting an acceleration signal indicating acceleration generated when the user is walking, and data processing means. The data processing means includes signal processing means for outputting as jerk data a vector composite value of a mean value of a jerk in an advancing direction when the user is walking and a mean value of a jerk in a gravity direction on the basis of the acceleration signal output by the acceleration measuring means, and leg muscle strength calculation means comprising a regression equation for calculating a leg muscle strength value, which is a numerical expression obtained by linearly combining the individual data and the jerk data.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2021,JPO&INPIT
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