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Table 5 Effect of the level of immersion on the spatiotemporal gait parameters

From: Virtual reality—enhanced walking in people post-stroke: effect of optic flow speed and level of immersion on the gait biomechanics

Gait parameter

Group

Condition

Time point

N

GRAIL

MD (SD)

HMD

MD (SD)

GRAIL vs. HMD

p-value

Walking speed (m/s)

Stroke

Fast

Pre

Post

16

− 0.01 (0.08)

− 0.10 (0.07)

0.001*

   

Mid

16

− 0.01 (0.11)

− 0.08 (0.14)

0.058

    

End

16

− 0.01 (0.12)

− 0.07 (0.12)

0.018*

  

Slow

Pre

Post

16

0.00 (0.05)

0.06 (0.05)

0.005*

    

Mid

16

0.00 (0.06)

0.08 (0.13)

0.087

    

End

16

0.01 (0.04)

0.08 (0.15)

0.088

 

Healthy

Fast

Pre

Post

16

− 0.04 (0.03)

− 0.12 (0.10)

0.013*

    

Mid

16

0.01 (0.07)

− 0.01 (0.09)

0.410

    

End

16

0.01 (0.08)

− 0.10 (0.21)

0.043*

  

Slow

Pre

Post

16

− 0.01 (0.03)

0.07 (0.06)

 < 0.001*

    

Mid

16

0.01 (0.04)

0.15 (0.09)

 < 0.001*

    

End

16

0.01 (0.03)

0.18 (0.11)

 < 0.001*

Cadence (stride/min)

Stroke

Fast

Pre

Post

16

− 1.02 (1.59)

− 2.41 (1.79)

0.841

   

Mid

16

− 0.88 (2.55)

− 2.12 (3.32)

0.051

    

End

15

− 1.07 (2.61)

− 2.66 (3.74)

0.001*

  

Slow

Pre

Post

16

1.18 (1.27)

1.44 (1.40)

0.377

    

Mid

15

1.10 (2.81)

1.13 (3.00)

0.393

    

End

14

1.23 (2.58)

0.66 (4.50)

0.077

 

Healthy

Fast

Pre

Post

16

− 0.38 (0.44)

− 1.41 (1.85)

0.030*

    

Mid

15

− 0.03 (0.95)

− 0.41 (1.85)

0.302

    

End

13

− 0.04 (1.08)

− 0.76 (2.29)

0.143

  

Slow

Pre

Post

15

0.65 (0.63)

1.16 (0.83)

0.068

    

Mid

15

0.88 (0.93)

2.35 (1.80)

0.008*

    

End

14

1.13 (1.61)

2.93 (2.26)

0.017*

Stride time (s)

Stroke

Fast

Pre

Post

16

0.03 (0.05)

0.10 (0.11)

0.030*

    

Mid

16

0.03 (0.09)

0.08 (0.12)

0.083

    

End

15

0.03 (0.10)

0.14 (0.32)

0.127

  

Slow

Pre

Post

16

− 0.04 (0.12)

− 0.05 (0.06)

0.581

    

Mid

15

− 0.04 (0.12)

− 0.01 (0.15)

0.642

    

End

14

− 0.05 (0.11)

− 0.02 (0.16)

0.446

 

Healthy

Fast

Pre

Post

16

0.01 (0.01)

0.04 (0.05)

0.050

    

Mid

15

0.00 (0.02)

0.01 (0.04)

0.219

    

End

13

0.00 (0.02)

0.02 (0.05)

0.107

  

Slow

Pre

Post

15

− 0.01 (0.01)

− 0.02 (0.02)

0.030*

    

Mid

15

− 0.02 (0.02)

− 0.05 (0.04)

0.009*

    

End

14

− 0.02 (0.03)

− 0.06 (0.05)

0.020*

Step length (cm)

Affected leg

Stroke

Fast

Pre

Post

16

0.43 (3.55)

− 4.58 (4.30)

 < 0.001*

   

Mid

16

1.20 (5.17)

− 2.13 (4.46)

0.030*

    

End

15

2.36 (5.54)

− 2.60 (6.55)

0.006*

  

Slow

Pre

Post

16

2.09 (1.71)

2.27 (2.03)

0.813

    

Mid

15

2.68 (5.21)

1.93 (4.71)

0.729

    

End

13

2.51 (3.77)

2.89 (5.74)

0.827

Step length (cm)

Unaffected leg

Stroke

Fast

Pre

Post

16

0.42 (3.84)

− 5.01 (5.02)

0.001*

   

Mid

16

− 0.02 (4.99)

− 2.50 (4.84)

0.099

    

End

15

0.57 (7.47)

− 2.71 (8.01)

0.141

  

Slow

Pre

Post

16

1.79 (3.57)

2.40 (2.94)

0.646

    

Mid

15

3.10 (9.15)

1.95 (6.43)

0.726

    

End

13

3.23 (8.39)

3.12 (5.21)

0.967

 

Healthy

Fast

Pre

Post

16

− 1.55 (1.35)

− 4.37 (3.63)

0.011*

    

Mid

15

0.36 (2.98)

− 0.16 (2.75)

0.552

    

End

14

0.69 (2.91)

− 1.74 (4.54)

0.039*

  

Slow

Pre

Post

15

1.40 (1.52)

1.74 (2.35)

0.616

    

Mid

15

1.84 (2.12)

4.09 (2.40)

0.010*

    

End

14

1.57 (1.77)

5.14 (2.72)

 < 0.001*

  1. Values are reported in MD (mean difference) and SD (standard deviation). GRAIL Gait Real-time Interactive Lab, HMD head-mounted display. The asterisk indicates a significant difference