Table 1. Fitted parameter values of the projection variables and kicking mechanics variables for the two participants. Data are means (± standard error). Variable Fit parameter Participant 1 Participant 2 symbol units (58 kicks) (25 kicks) Projection velocity vmax m·s-1 26.9 (.2) 24.2 (.2) θmax deg 50 (2) 41 (2) A (m·s-1)/deg2 .0017 (.0005) .0021 (.0007) r .51 .57 Projection height lleg m .62 (.03) .57 (.05) hmin m .37 (.01) .28 (.02) r .94 .92 Ball spin rate É·o deg·s-1 -4.5 (.4) -4.7 (5.7) B1 rev·s-1 .04 (.06) 1.1 (4.9) B2 /deg .06 (.02) .02 (.04) r .79 .61 Foot velocity vmax m·s-1 18.0 (.1) 16.4 (.2) θmax deg 44 (5) 46 (3) A (m·s-1)/deg2 .0007 (.0003) .0013 (.0005) r .48 .49 Horizontal hip velocity m (m·s-1)/deg -.022 (.004) .002 (.012) c m·s-1 2.6 (.2) 2.0 (.5) r .56 .04 Thigh rotational ROM m deg/deg .34 (.05) .01 (.07) c deg 89 (2) 78 (3) r .71 .04 Shank angular velocity m (deg·s-1)/deg 1.4 (.6) 4.7 (1.2) c deg·s-1 1760 (30) 1400 (50) r .30 .04 Thigh angular velocity m (deg·s-1)/deg -.4 (.8) -1.1 (1.0) c deg·s-1 80 (50) 150 (40) r .06 .23 Knee angle m deg/deg .13 (.03) -.01 (.06) c deg 50 (2) 68 (3) r .47 .03 Max thigh angular velocity m (deg·s-1)/deg -.1 (.9) -.8 (1.4) c deg·s-1 1160 (50) 930 (60) r .02 .12 and are the gradient and -intercept of a linear fit to the data, and is the correlation coefficient.