Action determination apparatus and action determination method

An action determination apparatus comprising:

• a three-axis acceleration sensor configured to measure acceleration on each of three axes Sx, Sy, and Sz;
• and
• a microcomputer configured to calculate acceleration on each of three axes Gx, Gy, and Gz of a human body from the acceleration on each of the three axes Sx, Sy, and Sz,
• wherein regarding the acceleration on each of the three axes Gx, Gy, and Gz calculated by the microcomputer, acceleration on one of the three axes is acceleration in a vertical direction perpendicular to the ground, and acceleration on each of the other two axes is acceleration in a direction parallel to the ground, the other two axes being perpendicular to each other,
• wherein the microcomputer is configured to determine a type of action of the human body in a predetermined period by comparing zero with the acceleration in the vertical direction in the predetermined period,
• wherein the microcomputer is configured to determine the type of action of the human body by comparing zero with a resultant acceleration of the acceleration on each of the three axes Gx, Gy, and Gz in the predetermined period,
• wherein the microcomputer is configured to determine that the action of the human body is an action including both running and jumping when detecting that the acceleration in the vertical direction is equal to or less than zero and that the resultant acceleration is consistently greater than zero in the predetermined period, and
• wherein the microcomputer is configured to determine that the action of the human body is jumping when detecting that the acceleration in the vertical direction is equal to or less than zero and that the resultant acceleration is equal to or less than zero in the predetermined period.