All 200 individual total force traces were compared to the twenty mean force curves using this method. With P=10, this results in ten normalized cross-correlations for each combination of players from which an average was taken. In each case, as expected, the cross correlation is highest when the force traces of a particular golfer are compared to the mean trace for that same golfer (all greater than 0.95). There was only one other occasion where such high correlation was reached.
Although it is difficult to split the various grip force signatures into categories with only twenty golfers tested, a few trends do appear to emerge. In all cases, impact occurs near a local minimum, with local maxima on either side. A number of golfers seem to have a fairly defined double peak occurring with impact ling somewhere in the middle. It is interesting to note that some of higher handicap golfers have less defined peaks surrounding impact. Additionally, in many cases it is comparisons between golfers with double-peak profiles that produce the higher cross-correlation values. According to the correlation, the two players who have the most similar total grip force profiles are shown in plots f and g of Fig. 2 (mean normalized cross correlation value of 0.95). These two player are included in a group of four that all have high cross correlations with one another (above 0.9), which include f, g, a and q. Another group with high cross correlations is p, g and l, suggesting the existence of families of grip force signatures.
All 200 individual total force traces were compared to the twenty mean force curves using this method. With P=10, this results in ten normalized cross-correlations for each combination of players from which an average was taken. In each case, as expected, the cross correlation is highest when the force traces of a particular golfer are compared to the mean trace for that same golfer (all greater than 0.95). There was only one other occasion where such high correlation was reached. Although it is difficult to split the various grip force signatures into categories with only twenty golfers tested, a few trends do appear to emerge. In all cases, impact occurs near a local minimum, with local maxima on either side. A number of golfers seem to have a fairly defined double peak occurring with impact ling somewhere in the middle. It is interesting to note that some of higher handicap golfers have less defined peaks surrounding impact. Additionally, in many cases it is comparisons between golfers with double-peak profiles that produce the higher cross-correlation values. According to the correlation, the two players who have the most similar total grip force profiles are shown in plots f and g of Fig. 2 (mean normalized cross correlation value of 0.95). These two player are included in a group of four that all have high cross correlations with one another (above 0.9), which include f, g, a and q. Another group with high cross correlations is p, g and l, suggesting the existence of families of grip force signatures.
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