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Table 4 Comparison between non-fatigued healthy subjects and fatigued healthy subjects

From: The influence of fatigue and chronic low back pain on muscle recruitment patterns following an unexpected external perturbation

  Principal effect gl F Sig (p) pŋ2 Power Post hoc/Simple factor
Start 1st Burst Condition 24(1) 4.739 0.040 0.165 0.552 With-F > Non-F
  Muscle   9.279 ≤0.001 0.279 0.996 BB < SE,RM; IO < LM; BB < EO
  Interaction   2.234 0.093 0.085 0.540  
  Group mean difference (95% CI) = 14% (−27, 1) for start 1st Burst
Start 2nd Burst Condition 9 (1) 0.693 0.427 0.071 0.116  
  Muscle   3.228 0.057 0.264 0.571  
  Interaction   0.623 0.568 0.065 0.146  
  Group mean difference (95% CI) = 10% (−38, 18) for start 2nd Burst
Duration 1st Burst Condition 24(1) 15.726 0.001 0.396 0.967 With-F < Non-F
  Muscle   42.055 ≤0.001 0.637 1.000 BB > EO > SE > RM,LM; IO > SE > RM,LM
  Interaction   8.794 0.001 0.268 0.963 BB = With-F < Non-F
  Group mean difference (95% CI) = 26% (−12, 39) for duration 1st Burst
Duration 2nd Burst Condition 9(1) 1.214 0.299 0.119 0.167  
  Muscle   3.023 0.098 0.251 0.413  
  Interaction   1.570 0.242 0.149 0.240  
  Group mean difference (95% CI) = 8% (−8, 24) for duration 2nd Burst
Num Bursts post impact Condition 24(1) 7.679 0.011 0.242 0.758 With-F < Non-F
  Muscle   1.574 0.198 0.062 0.422  
  Interaction   2.509 0.053 0.095 0.661  
  Group mean difference (95% CI) = 0.26% (−0.06, 0.45) for num Bursts post impact
Post/Pre Ratio Condition 24(1) 28.323 0.000 0.541 0.999 With-F < Non-F
  Muscle   20.182 0.000 0.457 1.000 BB,IO > EO > LM; BB,IO > SE > RM,LM
  Interaction   13.798 0.000 0.365 0.992 SE = With-F < Non-F
        BB = With-F < Non-F
  Group mean difference (95% CI) = 0.61% (−0.37, 0.85) for start post/Pre Ratio
Co-co post impact Condition 24(1) 4.625 0.042 0.162 0.542 With-F < Non-F
  Muscle   33.856 ≤0.001 0.585 1.000 SE&EO,SE&IO < EO&IO
  Interaction   0.399 0.577 0.016 0.098  
  Group mean difference (95% CI) = 19.20% (−0.77, 37.62) for co-co post impact
  1. Significant ANOVA results corresponding to the comparisons between healthy subjects without fatigue and healthy subjects with fatigue (group factor) and between muscles (muscle factor) for variables describing the timing and variables describing the amount of muscle activity post impact. Num bursts post impact number of bursts following the impact, Post/Pre Ratio ratio of root mean square of the post impact EMG signal amplitude and pre impact EMG signal amplitude, Co-co post impact co-contraction levels after the impact, BB biceps brachii, SE thoracic spinal erector, RM right multifidus, LM left multifidus, EO external oblique, IO internal oblique