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).