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Table 1 Effect of treadmill speed and slope on vertical load rate and energy cost of running

From: Correspondence Between Values of Vertical Loading Rate and Oxygen Consumption During Inclined Running

Slope (%)

 

Treadmill Speed (km h−1)

8

10

12

14

 + 20

VLR (N s−1 kg−1)

187.5 ± 22.0ac

   

ECR (J kg−1 m−1)

9.9 ± 0.6

\({\dot{\text{V}}\text{O}}_{{2}}\) (ml kg−1 min−1)

62.7 ± 4.7

   

 + 15

VLR (N s−1 kg−1)

184.2 ± 44.8

217.6 ± 43.1

  

ECR (J kg−1 m−1)

7.7 ± 1.2α

8.1 ± 0.6α

\({\dot{\text{V}}\text{O}}_{{2}}\) (ml kg−1 min−1)

52.8 ± 6

65.1 ± 3.7

  

 + 10

VLR (N s−1 kg−1)

181.2 ± 54.3

195.6 ± 60.8abαβ

238.1 ± 67.6

 

ECR (J kg−1 m−1)

6.7 ± 0.6α

6.5 ± 0.5α

6.4 ± 0.3α

\({\dot{\text{V}}\text{O}}_{{2}}\) (ml kg−1 min−1)

47.0 ± 3.6

54.6 ± 3.7

63.2 ± 2.9

 

 + 5

VLR (N s−1 kg−1)

199.7 ± 80.2

246.9 ± 88.6abβ

308.0 ± 104.6

318.0 ± 120.9

ECR (J kg−1 m−1)

5.1 ± 0.5α

4.9 ± 0.6α

4.9 ± 0.7α

5.0 ± 0.5α

\({\dot{\text{V}}\text{O}}_{{2}}\) (ml kg−1 min−1)

38.3 ± 3.3

43.2 ± 4.0

50.1 ± 5.3

58.3 ± 3.5

0

VLR (N s−1 kg−1)

210.3 ± 91.4abα

279.5 ± 134.4abαβ

337.0 ± 149.0

420.3 ± 184.6abγ

ECR (J kg−1 m−1)

4.0 ± 0.5α

3.9 ± 0.4α

3.9 ± 0.6α

4.0 ± 0.3α

\({\dot{\text{V}}\text{O}}_{{2}}\) (ml kg−1 min−1)

31.4 ± 3.2

37.2 ± 3.0a

43.0 ± 4.7

49.0 ± 3.3

 − 5

VLR (N s−1 kg−1)

269.6 ± 117.7bcα

335.8 ± 133.7

435.8 ± 164.7abγ

499.6 ± 167.1bcδ

ECR (J kg−1 m−1)

3.2 ± 0.4α

3.0 ± 0.4αβ

2.9 ± 0.5β

3.0 ± 0.4αβ

\({\dot{\text{V}}\text{O}}_{{2}}\) (ml kg−1 min−1)

26.2 ± 2.9

29.8 ± 2.9

33.8 ± 4.4

39.4 ± 3.4

 − 10

VLR (N s−1 kg−1)

340.6 ± 147.4

409.6 ± 145.3

507.1 ± 168.7

597.0 ± 181.9

ECR (J kg−1 m−1)

2.8 ± 0.6α

2.6 ± 0.5

2.5 ± 0.4

2.6 ± 0.4β

\({\dot{\text{V}}\text{O}}_{{2}}\) (ml kg−1 min−1)

23.8 ± 3.8

26.8 ± 4.0

30.2 ± 3.9a

34.6 ± 4.1

 − 20

VLR (N s−1 kg−1)

 

633.3 ± 140.3

756.8 ± 165.6

884.6 ± 166.3

ECR (J kg−1 m−1)

2.2 ± 0.4

2.2 ± 0.5

2.1 ± 0.5γ

\({\dot{\text{V}}\text{O}}_{{2}}\)(ml kg−1 min−1)

 

23.9 ± 3.6α

27.1 ± 4.9aαβ

29.3 ± 6.3β

  1. Values are means ± SD, Vertical load rate (VLR) normalized by bodyweight, energy cost of running (ECR) and oxygen consumption (\({\dot{\text{V}}\text{O}}_{{2}}\)). Superscript letters represent post-hoc pairwise comparisons with the same letters being not statistically different. Comparison between slopes at the same speed are represented using a < b < c < d (mean increasing order), while comparison between speeds at same slope use α < β < γ < δ at p < 0.05.