Table 7 Correlations between feedback-guided motor adjustments and the time-dependent force structure

Approximate entropy—15% MVC

 Control

  Pearson correlation

− 0.418*

− 0.572*

− 0.420*

− 0.265

− 0.363*

− 0.398*

− 0.412*

  p-value (2-tailed)

< .001

< .001

< .001

0.057

0.006

0.003

0.002

  N

72

68

66

52

55

54

55

 ASD

Pearson correlation

− 0.652*

− 0.615*

− 0.396*

− 0.673*

− 0.529*

− 0.332*

− 0.272

p-value (2-tailed)

< .001

< .001

0.001

< .001

< .001

0.048

0.043

N

75

71

69

37

42

36

56

Approximate entropy—45% MVC

 Control

  Pearson correlation

− 0.416*

− 0.710*

− 0.518*

− 0.538*

− 0.468*

− 0.501*

− 0.479*

  p-value (2-tailed)

< .001

< .001

< .001

< .001

0.001

< .001

< .001

  N

68

68

66

48

51

50

53

 ASD

  Pearson correlation

− 0.473*

− 0.715*

− 0.594*

− 0.519*

− 0.350

− 0.568*

− 0.307

  p-value (2-tailed)

< .001

< .001

< .001

0.001

0.025

< .001

0.022

  N

71

71

68

36

41

35

55

Approximate entropy—85% MVC

 Control

  Pearson correlation

− 0.342*

− 0.553*

− 0.669*

− 0.380*

− 0.344

− 0.319

− 0.412*

  p-value (2-tailed)

0.005

< .001

< .001

0.009

0.015

0.027

0.002

  N

66

66

66

46

49

48

52

 ASD

  Pearson correlation

− 0.285*

− 0.471*

− 0.516*

− 0.365

− 0.139

− 0.27

− 0.258

  p-value (2-tailed)

0.018

< .001

< .001

0.037

0.405

0.135

0.064

  N

69

68

69

33

38

32

52

Approximate entropy—0.06 degrees

 Control

  Pearson correlation

− 0.475*

− 0.583*

− 0.562*

− 0.535*

− 0.451*

− 0.381*

− 0.165

  p-value (2-tailed)

< .001

< .001

< .001

< .001

0.001

0.006

0.316

  N

52

48

46

52

52

51

39

 ASD

  Pearson correlation

− 0.585*

− 0.487*

− 0.586*

− 0.645*

− 0.519*

− 0.359*

− 0.048

  p-value (2-tailed)

< .001

0.003

< .001

< .001

0.001

0.047

0.795

  N

37

36

33

37

37

31

32

Approximate entropy—0.62 degrees

 Control

  Pearson correlation

− 0.540*

− 0.618*

− 0.509*

− 0.496*

− 0.613*

− 0.482*

− 0.137

  p-value (2-tailed)

< .001

< .001

< .001

< .001

< .001

< .001

0.399

  N

55

51

49

52

55

54

40

 ASD

  Pearson correlation

− 0.735*

− 0.524*

− 0.466*

− 0.666*

− 0.746*

− 0.510*

− 0.25

  p-value (2-tailed)

< .001

< .001

0.003

< .001

< .001

0.001

0.154

  N

42

41

38

37

42

36

34

Approximate entropy—21.13 degrees

 Control

  Pearson correlation

− 0.419*

− 0.548*

− 0.282

− 0.378*

− 0.412*

− 0.670*

− 0.074

  p-value (2-tailed)

0.002

< .001

0.052

0.006

0.002

< .001

0.652

  N

54

50

48

51

54

54

40

ASD

  Pearson correlation

− 0.407*

− 0.754*

− 0.488*

− 0.436

− 0.292

− 0.800*

− 0.039

  p-value (2-tailed)

0.014

< .001

0.005

0.014

0.084

< .001

0.84

  N

36

35

32

31

36

36

30