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Appendix B

Steady speed Fourier coefficients during level trotting at 2.86 m s-1

Vertical force curves

a1,fore (BW)b2,fore (BW)a3,fore (BW)
1.06±0.02 -0.071±0.014 0.051±0.008 
1.05±0.03 -0.025±0.015* 0.061±0.013 
1.08±0.02 -0.041±0.011* 0.064±0.012* 
1.02±0.03* -0.039±0.015* 0.062±0.011 
 1.05 -0.044 0.060 
a1,fore (BW)b2,fore (BW)a3,fore (BW)
1.06±0.02 -0.071±0.014 0.051±0.008 
1.05±0.03 -0.025±0.015* 0.061±0.013 
1.08±0.02 -0.041±0.011* 0.064±0.012* 
1.02±0.03* -0.039±0.015* 0.062±0.011 
 1.05 -0.044 0.060 
a1,hind (BW)b2,hind (BW)a3,hind (BW)
0.708±0.016 -0.079±0.008 0.019±0.003 
0.640±0.010* -0.060±0.011* 0.010±0.006* 
0.636±0.015* -0.058±0.010* 0.013±0.004* 
0.706±0.021 -0.060±0.010* 0.011±0.006* 
 0.673 0.064 0.013 
a1,hind (BW)b2,hind (BW)a3,hind (BW)
0.708±0.016 -0.079±0.008 0.019±0.003 
0.640±0.010* -0.060±0.011* 0.010±0.006* 
0.636±0.015* -0.058±0.010* 0.013±0.004* 
0.706±0.021 -0.060±0.010* 0.011±0.006* 
 0.673 0.064 0.013 
Fore-aft force curves
a1,foreb2,forea3,fore
-0.052±0.004 0.149±0.005 -0.002±0.005 
-0.055±0.006 0.143±0.006 -0.012±0.004* 
-0.045±0.005* 0.153±0.005 -0.007±0.004 
-0.050±0.007 0.139±0.006* -0.004±0.005 
 -0.051 0.146 -0.006 
Fore-aft force curves
a1,foreb2,forea3,fore
-0.052±0.004 0.149±0.005 -0.002±0.005 
-0.055±0.006 0.143±0.006 -0.012±0.004* 
-0.045±0.005* 0.153±0.005 -0.007±0.004 
-0.050±0.007 0.139±0.006* -0.004±0.005 
 -0.051 0.146 -0.006 
a1,hindb2,hinda3,hind
0.087±0.005 0.075±0.004 0.004±0.003 
0.085±0.005 0.069±0.005* 0.002±0.004 
0.073±0.006* 0.070±0.003* 0.004±0.003 
0.076±0.007* 0.083±0.006* 0.005±0.005 
 0.080 0.074 0.004 
a1,hindb2,hinda3,hind
0.087±0.005 0.075±0.004 0.004±0.003 
0.085±0.005 0.069±0.005* 0.002±0.004 
0.073±0.006* 0.070±0.003* 0.004±0.003 
0.076±0.007* 0.083±0.006* 0.005±0.005 
 0.080 0.074 0.004 

Values are ± 95% C.I. for each loading condition and overall means are shown.

Significant differences (P<0.05) from the unloaded condition are indicated by asterisks.

U, unloaded; M, mid-load; F, fore-load; H, hind-load.

For an explanation of the Fourier coefficients a1, a2 and b2, see Materials and methods.

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