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Table 3 Estimation of V̇O2 with model 2 and exercise mode comparisons

From: Interchangeability and optimization of heart rate methods for estimating oxygen uptake in ergometer cycling, level treadmill walking and running

Exercise intensity

  

Very light – light

Moderate

Vigorous

25%HRR

35%HRR

45%HRR

55%HRR

65%HRR

75%HRR

85%HRR

HR (beats·min−1)

84.1 ± 6.2

97.6 ± 6.3

111.0 ± 6.5

124.4 ± 6.8

137.9 ± 7.2

151.3 ± 7.7

164.7 ± 8.2

Estimation of

Cyclinga

0.84 ± 0.35

1.23 ± 0.41

1.61 ± 0.49

2.00 ± 0.58

2.39 ± 0.67

2.78 ± 0.76

3.17 ± 0.85

V̇O2 (L·min− 1)

 

(0.69 to 0.98)

(1.05 to 1.40)

(1.41 to 1.82)

(1.76 to 2.25)

(2.11 to 2.67)

(2.46 to 3.10)

(2.81 to 3.53)

 

Walkingb

0.95 ± 0.37

1.34 ± 0.44

1.73 ± 0.51

2.12 ± 0.59

2.52 ± 0.67

2.91 ± 0.76

3.30 ± 0.84

  

(0.80 to 1.11)

(1.16 to 1.53)

(1.52 to 1.95)

(1.87 to 2.38)

(2.23 to 2.80)

(2.59 to 3.23)

(2.94 to 3.66)

 

Runningc

0.86 ± 0.34

1.25 ± 0.39

1.64 ± 0.46

2.03 ± 0.54

2.42 ± 0.62

2.81 ± 0.71

3.21 ± 0.79

  

(0.72 to 1.00)

(1.08 to 1.41)

(1.45 to 1.83)

(1.81 to 2.26)

(2.16 to 2.69)

(2.52 to 3.11)

(2.87 to 3.54)

Absolute

Walk vs Cyc

0.11 ± 0.23

0.12 ± 0.21*

0.12 ± 0.19*

0.12 ± 0.17**

0.12 ± 0.17**

0.13 ± 0.17**

0.13 ± 0.18**

differences

 

(0.02 to 0.21)

(0.03 to 0.20)

(0.04 to 0.20)

(0.05 to 0.19)

(0.05 to 0.19)

(0.06 to 0.20)

(0.05 to 0.20)

(L·min−1)

Run vs Cyc

0.02 ± 0.20

0.02 ± 0.17

0.03 ± 0.15

0.03 ± 0.14

0.03 ± 0.13

0.03 ± 0.14

0.04 ± 0.16

  

(− 0.06 to 0.11)

(− 0.05 to 0.10)

(− 0.04 to 0.09)

(− 0.03 to 0.09)

(− 0.03 to 0.09)

(− 0.03 to 0.09)

(− 0.03 to 0.10)

 

Run vs Walk

− 0.09 ± 0.27

− 0.09 ± 0.23

−0.09 ± 0.20

−0.09 ± 0.17*

−0.09 ± 0.14**

−0.09 ± 0.12**

−0.09 ± 0.09***

  

(−0.21 to 0.02)

(− 0.19 to 0.01)

(− 0.18 to − 0.01)

(−0.17 to − 0.02)

(−0.15 to − 0.03)

(−0.14 to − 0.04)

(−0.13 to − 0.05)

Relative

Walk vs Cyc

22.6 ± 52.2

11.8 ± 23.3*

8.4 ± 14.3*

6.7 ± 10.1**

5.7 ± 7.9**

5.0 ± 6.7**

4.6 ± 6.1**

differences

 

(0.5 to 44.6)

(1.9 to 21.6)

(2.3 to 14.4)

(2.4 to 11.0)

(2.4 to 9.0)

(2.2 to 7.9)

(2.0 to 7.1)

(%)

Run vs Cyc

6.5 ± 27.6

3.5 ± 15.0

2.7 ± 9.9

2.3 ± 7.4

2.0 ± 6.1

1.9 ± 5.6

1.8 ± 5.4

  

(−5.2 to 18.1)

(−2.8 to 9.9)

(− 1.5 to 6.9)

(− 0.9 to 5.4)

(− 0.6 to 4.6)

(− 0.5 to 4.2)

(−0.5 to 4.1)

 

Run vs Walk

− 5.3 ± 29.9

− 4.9 ± 17.9

−4.2 ± 11.8

− 3.7 ± 8.0

−3.2 ± 5.5*

− 2.9 ± 3.8**

−2.6 ± 2.5***

  

(− 17.9 to 7.3)

(− 12.5 to 2.7)

(− 9.2 to 0.7)

(− 7.1 to − 0.3)

(− 5.6 to − 0.9)

(− 4.5 to − 1.3)

(− 3.7 to − 1.5)

  1. Values are based on all participants’ (n = 24) individual regression equations (Additional file 2: Table S5) and presented as mean ± SD and (95% CI)
  2. Significance of exercise mode differences: *P < 0.05, **P < 0.01, ***P < 0.001
  3. Calculation of the absolute differences: Walk vs Cyc = b-a, Run vs Cyc = c-a, and Walk vs Run = c-b
  4. Calculation of the relative differences: Walk vs Cyc = ((b-a) · a− 1) · 100, Run vs Cyc = ((c-a) · a− 1) · 100, and Walk vs Run = ((c-b) · b− 1) · 100