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Table 2 Test-retest reliability and repeatability of feedback-controlled robotics-assisted treadmill exercise based cardiopulmonary exercise testing

From: Cardiopulmonary exercise testing early after stroke using feedback-controlled robotics-assisted treadmill exercise: test-retest reliability and repeatability

 

Trial 1

Trial 2

 
 

mean±SD

(range)

mean±SD

(range)

p-value

MD

(LoA)

CoV

ICC

(95% CI)

SEM

SEM%

MDC

MDC%

Constant load testing (n =18)

              

VO2 cost of passive walking [mL/min]

200.4±112.0

(41.4-426.4)

167.9±136.2

(−3.7-506.5)

0.23

32.5

(−182.4, 247.5)

0.58

0.62

(0.25-0.84)

66.3

36

183.7

100

VO2 cost of active walking [mL/min/W]

43.4±53.0

(−2.5-212.8)

48.1±61.4

(2.0-214.2)

0.62

4.6

(−141.2, 150.5)

1.59

0.20

(−0.31-0.61)

65.2

143

180.8

395

Heart rate cost of passive walking [beats/min]

0.6±5.9

(−14.5-7.8)

2.3±6.9

(−13.0-15.4)

0.68

1.6

(−13.2, 16.5)

5.20

0.33

(−0.15-0.68)

6.1

426

16.9

1182

Heart rate cost of active walking [beats/min/W]

2.4±3.6

(0.0-15.5)

2.1±2.5

(0.3-9.3)

0.91

0.3

(−7.1, 7.6)

1.62

0.32

(−0.18-0.68)

3.0

134

8.4

370

Deviation of work rate (RMSEP) [W]

5.4±5.3

(1.4-20.9)

5.5±5.8

(0.9-21.4)

0.95

0.0

(−11.2, 11.3)

1.03

0.50

(0.05-0.78)

4.0

73

11.0

201

Incremental exercise testing (n =14)

              

Peak VO2 uptake (VO2peak absolute) [mL/min]

1258.1±612.1

(460.3-2490.3)

1303.6±535.5

(583.2-2427.8)

0.47

45.5

(−662.0, 753.0)

0.28

0.82

(0.53-0.94)

150.5

12

417.1

33

Peak VO2 uptake/body mass (VO2peak relative) [mL/min/kg]

15.0±4.8

(7.2-23.4)

15.9±5.2

(9.1-27.9)

0.33

1.0

(−6.7, 8.6)

0.25

0.72

(0.33-0.89)

2.0

13

5.6

36

Time to VO2peak (tVO2peak) [min]

7.5±1.7

(4.9-10.8)

8.8±3.2

(4.1-16.9)

0.14

1.3

(−4.2, 6.8)

0.34

0.39

(−0.09-0.74)

2.2

26

6.0

73

Peak work rate (Ppeak) [W]

52.7±33.2

(11.3-107.4)

55.1±35.6

(7.9-101.0)

0.64

2.4

(−27.7, 32.5)

0.28

0.91

(0.74-0.97)

4.5

8

12.6

23

Peak ventilation rate (VEpeak) [L/min]

40.3±18.6

(15.7-82.8)

42.4±19.3

(21.7-96.7)

0.73

2.1

(−34.5, 38.6)

0.44

0.55

(0.33-0.83)

12.3

30

34.1

82

Peak respiratory rate (Rfpeak) [1/min]

36.5±9.7

(22.7-54.7)

35.8±7.0

(23.9-44.3)

0.73

0.7

(−14.0, 15.4)

0.20

0.64

(0.18-0.87)

4.4

12

12.2

34

Peak heart rate (HRpeak) [beats/min]

124.2±17.6

(97–148)

127.9±21.8

(95–160)

0.35

3.6

(−21.6, 28.9)

0.10

0.80

(0.49-0.93)

5.7

5

15.8

13

Peak respiratory exchange ratio (RERpeak)

0.91±0.05

(0.84-1.00)

0.93±0.11

(0.79-1.21)

0.55

0.01

(−0.18, 0.21)

0.11

0.39

(−0.18-0.76)

0.08

8

0.21

23

Gas exchange threshold (GET absolute) [mL/min]

911.3±365.1

(323.8-1642.7)

844.0±265.0

(491.2-1255.1)

0.51

67.3

(−181.0, 315.6)

0.14

0.91

(0.74-0.97)

36.6

4

101.5

12

GET/body mass (GET relative) [mL/min/kg]

11.1±3.1

(5.1-14.7)

10.8±3.1

(5.3-16.6)

0.65

0.2

(−2.9, 3.4)

0.14

0.88

(0.65-0.96)

0.5

5

1.5

14

GET% of VO2peak (GET%) [%]

75.1±11.1

(59.4-94.1)

69.9±13.2

(49.8-92.4)

0.09

5.2

(−16.3, 26.8)

0.15

0.57

(0.08-0.84)

7.1

10

19.7

27

O2 cost of work (ΔVO2/ΔP) [mL/min/W]

18.7±13.8

(5.7-51.1)

21.4±15.5

(4.9-60.4)

0.12

2.7

(−11.7, 17.1)

0.36

0.87

(0.66-0.96)

2.6

13

7.1

36

O2 pulse at VO2peak (O2pulse) [mL/beat]

10.2±4.6

(3.2-19.2)

10.3±3.8

(4.4-16.2)

0.73

0.1

(−3.3, 3.4)

0.17

0.92

(0.78-0.98)

0.5

5

1.3

13

VE versus VCO2 slope (ΔVE/ΔVCO2) [L]

36.6±6.9

(20.4-47.6)

36.1±8.0

(18.4-52.2)

0.93

0.5

(−9.6, 10.6)

0.14

0.78

(0.44-0.92)

2.4

7

6.6

18

Deviation of work rate (RMSEP) [W]

8.8±10.3

(1.3-32.2)

8.5±7.7

(1.4-27.9)

0.93

0.3

(−21.9, 22.5)

1.28

0.28

(−0.32-0.70)

9.4

109

26.2

301

  1. Abbreviations: SD Standard deviation, MD Mean difference, LoA Limits of agreement, CoV Coefficients of variation, ICC Intraclass correlation coefficient, CI Confidence interval, SEM Standard error of the measurement, MDC Minimal detectable change.
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Journal of NeuroEngineering and Rehabilitation

ISSN: 1743-0003

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