Table 3.

Stride, stance and swing periods for individual legs during unperturbed and perturbed running

LeftRight
FrontMiddleHindFrontMiddleHind
Stride period (ms)
Unperturbed101±12 (8)103±3 (8)99±10 (8)103±4 (8)100±10 (8)101±13 (8)
During perturbation112±20 (9)106±18 (7)111±19 (7)108±18 (7)111±19 (9)107±16 (6)
P 0.240.670.180.490.170.51
After perturbation106±12 (9)113±17 (8)109±14 (7)112±16 (6)115±24 (7)109±17 (7)
P 0.460.120.170.190.150.37
Stance duration (ms)
Unperturbed46±5 (8)55±11 (8)54±12 (8)49±9 (8)57±5 (8)52±9 (8)
During perturbation55±22 (5)66±4 (6)60±19 (4)46±7 (5)75±22 (3)60±5 (3)
P 0.350.050.550.560.090.19
After perturbation50±7 (8)67±13 (8)51±5 (9)55±17 (6)60±8 (9)60±15 (7)
P 0.230.080.610.430.340.24
Swing duration (ms)
Unperturbed56±7 (8)44±5 (8)45±6 (8)53±8 (8)45±3 (8)47±6 (8)
During perturbation54±9 (4)42±3 (4)49±10 (5)56±12 (5)44±6 (5)52±14 (3)
P 0.720.530.450.660.880.49
After perturbation58±5 (8)41±6 (8)49±11 (9)56±11 (6)43±8 (9)45±2 (7)
P 0.670.320.370.630.650.43
  • `After perturbation' refers to all steps occurring after the stride during which the perturbation occurred.

    Numbers in parentheses indicate the number of samples used in the comparison.

    Numbers below values indicate P-values for comparisons with unperturbed running.

    Values are means ± S.D.