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).