Golf swing analysis method using attachable acceleration sensors

A golf club selection method comprising steps of:

• preparing a radio type acceleration measuring device capable of measuring respective accelerations in three axis directions of an x-axis direction, a y-axis direction, and a z-axis direction;
• mounting the acceleration measuring device to a golf player's body;
• providing a data analysis device for receiving measured data from the acceleration measuring device during a swing through radio communication;
• the data analysis device analyzing a golf swing based on the measured data from the acceleration measuring device and providing a swing analysis, and selecting a golf club suitable for the golf player performing the swing based on the measured data of the swing analysis,
• wherein the swing analysis comprises steps of:
• comparing repeatabilities of swings by a same golf player with different golf clubs, and determining a golf club having higher repeatability to be relatively suitable for the golf player;
• or
• comparing repeatabilities of swings by a same golf player with a plurality of kinds of golf clubs which are different only in a shaft, and determining a shaft having higher repeatability to be relatively suitable for the golf player, wherein when an acceleration data in the x-axis direction is set to Ax, an acceleration data in the y-axis direction is set to Ay, and an acceleration data in the z-axis direction is set to Az, and the repeatability of determined by (A), (B) or (C) as defined below:
• (A) a maximum value and a minimum value in a specific section during the swing are obtained for a value calculated from the acceleration Ax, the acceleration Ay, the acceleration Az, or at least one of the accelerations;
• and a difference between the maximum value and the minimum value is taken as an indication of the swing analysis, and repeatability of the swing is determined based on the indication of the swing analysis;
• (B) a maximum value and a minimum value in a specific section during the swing are obtained for a value calculated from the acceleration Ax, the acceleration Ay, the acceleration Az, or at least one of the accelerations;
• and a time difference Td1 between a time of the maximum value and a time of the minimum value is taken as an indication of the swing analysis, and repeatability of the swing is determined based on the indication of the swing analysis;
• (C) when a same golf player swings a same golf club plural times, a plurality of graph lines are obtained based on data of the plurality of swings;
• and
• an area s1 surrounded by the plurality of graph lines is taken as an indication of the swing analysis, and repeatability of the swing is determined based on the indication of the swing analysis.