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Table 1 Inference statistics of within-subject comparisons between tasks

From: Muscle oxygenation and time to task failure of submaximal holding and pulling isometric muscle actions and influence of intermittent voluntary muscle twitches

Variable

Group

Fatiguing task

Mean ± SD

t-values (df)/z-values

Significance level

(1.) Baseline value in %

HP

HIMA

73.78 ± 6.63

t(8) = − 1.53

p = 0.164

  

PIMA

77.44 ± 4.06

  
 

HT

HIMA

74.61 ± 6.98

z = − 0.30, n = 9

pexact = 0.820

  

Twitch

74.00 ± 5.01

  
 

Both

HIMA

74.19 ± 6.62

z = − 1.15, n = 18

pexact = 0.265

  

PIMA & Twitch

75.72 ± 4.77

  

(2.) max. SvO2 decrease in pp (% to baseline)

HP

HIMA

16.02 ± 7.75

(21.71 ± 10.50)

t(8) = − 1.73

p = 0.121

  

PIMA

20.61 ± 10.16

(26.61 ± 13.12)

  
 

HT

HIMA

30.33 ± 14.60

(40.65 ± 19.57)

t(8) = − 0.12

p = 0.909

  

Twitch

30.65 ± 16.76

(41.42 ± 22.65)

  
 

Both

HIMA

23.17 ± 13.52

(31.23 ± 18.22)

z = − 0.81, n = 18

pexact = 0.442

  

PIMA & Twitch

25.63 ± 14.40

(33.85 ± 19.02)

  

(3.) SvO2 slope in pp s−1

HP

HIMA

− 2.21 ± 1.51

t(8) = 0.55

p = 0.598

  

PIMA

− 2.41 ± 1.59

  
 

HT

HIMA

− 3.63 ± 1.56

t(8) = − 0.94

p = 0.373

  

Twitch

− 3.11 ± 1.31

  
 

Both

HIMA

− 2.79 ± 1.60

t(17) = − 0.11

p = 0.913

  

PIMA & Twitch

− 2.76 ± 1.46

  

(4.) SvO2 at rHb min. in %

HP

HIMA

61.96 ± 3.87

t(8) = − 0.90

p = 0.392

  

PIMA

62.42 ± 4.56

  
 

HT

HIMA

58.66 ± 2.61

t(8) = − 0.31

p = 0.768

  

Twitch

58.81 ± 3.04

  
 

Both

HIMA

60.31 ± 3.63

t(17) = − 0.89

p = 0.388

  

PIMA & Twitch

60.62 ± 4.20

  

(5.) TSS in s

HP

HIMA

7.72 ± 3.01

t(8) = − 0.5

p = 0.630

  

PIMA

8.45 ± 2.72

  
 

HT

HIMA

7.61 ± 2.61

t(8) = − 1.01

p = 0.344

  

Twitch

8.78 ± 2.92

  
 

Both

HIMA

7.67 ± 2.74

t(17) = − 1.05

p = 0.309

  

PIMA & Twitch

8.62 ± 2.74

  

(6.) TTF in s

HP

HIMA

44.80 ± 18.06

t(8) = − 0.90

p = 0.394

  

PIMA

50.33 ± 9.46

  
 

HT

HIMA

42.63 ± 7.64

t(8) = − 2.40

p = 0.043

  

Twitch

52.78 ± 11.61

  
 

Both

HIMA

43.72 ± 13.50

t(17) = − 2.15

p = 0.047

  

PIMA & Twitch

51.55 ± 10.35

  
  1. HIMA, holding isometric muscle action; max. SvO2 decrease, maximal deoxygenation; PIMA, pulling isometric muscle action; rHb, relative hemoglobin amount; SvO2, local capillary oxygen saturation; SvO2 at rHb min., SvO2 level at global minimum of rHb; SvO2 slope, slope of initial linear SvO2 decrease; TTF, time to task failure; TSS, time to leveling off into a steady state of SvO2
  2. Significant differences are in bold