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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
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BMC Musculoskeletal Disorders

ISSN: 1471-2474

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