Table 1. Group mean parameters for the linear line of best fit (y = slope(x) + y-intercept) during running with preferred stride length (PSL) and constrained stride length (SL2.5). Units for slope are the parameter units per ms; units for y-intercept are the parameter units. Data are means (±SD).
PSL SL2.5
Parameter Slope
(units/m·s-1)		 y-intercept (units) Slope
(units/m·s-1)		 y-intercept
(units)
Vertical Impact Force (BW) .178 (.16) * 1.11 (.48) -.003 (.13) 1.62 (.63)
Resultant Impact Force (BW) .186 (.17) * 1.09 (.51) .001 (.13) 1.62 (.63)
Resultant force direction (deg) 1.00 (1.5) 91.94 (5.33) .41 (2.3) 93.57 (7.58)
Active Force (BW) .191 (.19) * 1.92 (.21) .049 (.9) 2.22 (.58)
Average Force (BW) .160 (.05) * .91 (.22) -.016 (.03) 1.47 (.29)
Leg Impact Acceleration (g) .89 (.61) 1.95 (1.73) .07 (.44) 5.02 (2.55)
Head Impact Acceleration (g) -.01 (.24) 1.32 (.65) -.09 (.11) 1.54 (1.00)
Impact Attenuation (%) 5.12 (2.88) * 55.52 (11.91) 1.39 (1.51) 72.11 (9.14)
Stride Length (m) .57 (.10) * .61 (.38) .05 (.07) 2.46 (.21)
Stride Frequency (Hz) .09 (.05) * 1.04 (.26) .36 (.04) .08 (.11)
Stancetime (s) -.048 (.01) * .43 (.06) -.077 (.02) .54 (.08)
* indicates the slopes were different between stride length conditions (p < 0.05).