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Table 3 Outcome measures for overground and treadmill running

From: Comparison of vertical ground reaction forces during overground and treadmill running. A validation study

 

OG mean ± SD

TM mean ± SD

ICC(3,1) (95%CI)

Mean diff (LOA) diff (lowLim, upLim)

RLOA (%)

Fz1 (BW)

     

HS

Slow

1.67 ± 0.26

1.70 ± 0.23

0.74 (0.37, 0.91)

0.03 (−0.32, 0.38)

20.8

 

Preferred

1.94 ± 0.45

1.93 ± 0.30

0.71 (0.35, 0.89)

−0.01 (−0.57, 0.55)

28.8

 

Fast

1.94 ± 0.25

2.06 ± 0.32

0.76 (0.35, 0.92)

0.12 ( −0.28, 0.52)

19.9

Fz2 (BW)

     

HS

Slow

2.54 ± 0.20

2.53 ± 0.18

0.77 (0.49, 0.91)

−0.02 (−0.27, 0.23)

9.9

 

Preferred

2.70 ± 0.26

2.65 ± 0.25

0.89 (0.76, 0.96)

−0.03 (−0.25, 0.17)

7.9

 

Fast

2.77 ± 0.24

2.70 ± 0.22

0.86 (0.67, 0.95)

−0.06 (−0.27, 0.15)

7.8

NHS

Slow

2.56 ± 0.17

2.55 ± 0.20

   
 

Preferred

2.61 ± 0.15

2.58 ± 0.13

   
 

Fast

2.79 ± 0.15

2.78 ± 0.20

   

LR (BW/s)

     

HS

Slow

81.11 ± 25.62

87.28 ± 23.39

0.76 (0.47, 0.90)

3.25 (−28.62, 35.12)

39.9

 

Preferred

95.34 ± 26.67

105. 33 ± 25.08

0.80 (0.57, 0.91)

6.11 (−26.21, 38.42)

34.3

 

Fast

104.40 ± 29.29

118.08 ± 33.73

0.70 (0.36, 0.88)

7.17 (−37.69, 52.02)

42.7

NHS

Slow

70.03 ± 14.68

65.09 ± 13.74

   
 

Preferred

77.00 ± 22.35

74.25 ± 16.47

   
 

Fast

95.81 ± 26.02

87.41 ± 18.74

   

ALR (BW/s)

     

HS

Slow

68.89 ± 20.26

73.92 ± 20.22

0.84 (0.63, 0.93)

2.98 (−24.74, 30.70)

45.3

 

Preferred

82.14 ± 21.38

88.70 ± 20.75

0.89 (0.74, 0.95)

3.60 (−23.01, 30.21)

36.4

 

Fast

90.70 ± 23.66

100.77 ± 29.10

0.86 (0.67, 0.95)

4.08 (−31.26, 39.42)

45.4

NHS

Slow

33.96 ± 6.07

31.21 ± 5.01

   
 

Preferred

47.09 ± 22.92

33.78 ± 4.20

   
 

Fast

43.63 ± 13.89

36.00 ± 4.20

   

tFz1 (ms)

     

HS

Slow

35 ± 4.08

35 ± 4.86

0.76 (0.40, 0.92)

0.0 ( −5.4, 5.4)

15.5

 

Preferred

34 ± 4.42

34 ± 3.35

0.82 (0.56, 0.93)

0.3 ( −4.4, 5.0)

13.8

 

Fast

32 ± 5.00

33 ± 4.88

0.87 (0.61, 0.96)

0.6 ( −3.7, 4.8)

13.0

tFz2 (ms)

     

HS

Slow

112 ± 13.55

109 ± 10.22

0.84 (0.63, 0.94)

−1.8 (−15.4, 11.8)

12.6

 

Preferred

102 ± 13.28

100 ± 12.19

0.94 (0.85, 0.97)

−1.6 (−10.1, 6.8)

8.5

 

Fast

99 ± 10.00

96 ± 11.47

0.87 (0.68, 0.95)

−3.0 (−13.5, 7.5)

11.0

NHS

Slow

102 ± 13.00

103 ± 15.00

   
 

Preferred

99 ± 12.00

98 ± 11.00

   
 

Fast

92 ± 80 0

91 ± 10.00

   

CT (ms)

     

HS

Slow

258 ± 22.00

254 ± 21.13

0.92 (0.80, 0.97)

−4.0 (−21.4, 13.4)

6.9

 

Preferred

232 ± 23.34

232 ± 20.49

0.92 (0.82, 0.97)

−2.0 (−17.2, 13.2)

6.6

 

Fast

223 ± 21.00

220 ± 21.14

0.95 (0.87, 0.98)

−3.3 (−15.6, 9.1)

5.7

NHS

Slow

240 ± 17.00

237 ± 19.00

   
 

Preferred

229 ± 12.00

222 ± 12.00

   
 

Fast

213 ± 12.00

206 ± 12.00

   
  1. Intraclass correlations, mean-differences with limits of agreement (LOA), and ratio limits of agreement (RLOA) were reported. Both HS and NHS runners were taken into account in the statistical analysis. Number of participants: HS (slow: N=14, preferred: N=16, fast: N=12), NHS (slow: N=5, preferred: N=5, fast: N=6).
  2. HS: Heelstrike-runner, NHS: Non-Heelstrike-runner, CI: Confidence Interval, LOA: Limit of Agreement, RLOA: Ratio Limit of Agreement, OG: Overground, TM: Treadmill, BW: Body Weight.
  3. Slow running speed: HS runners: 11.0 ± 1.3 km·h-1, NHS runners: 10.9 ± 1.5 km·h-1.
  4. Preferred running speed: HS runners: 12.7 ± 1.6 km·h-1, NHS runners: 11.8 ± 1.5 km·h-1.
  5. Fast running speed: HS runners: 14.1 ± 2.0 km·h-1, NHS runners: 13.9 ± 1.9 km·h-1.
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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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