Muscle Activation Pattern During Isometric Ab Wheel Rollout Exercise in Different Shoulder Angle-Positions_2015

Abstract

OBJECTIVE:
To investigate muscle activation of the shoulder extensors and trunk stabilizers by surface electromyography (sEMG) activity during the isometric Ab Wheel Rollout exercise in different shoulder joint positions.

METHOD:
We recruited 8 young, healthy, resistance trained men (age: 25 ± 3 years, height: 178 ± 5 cm, and total body mass: 81 ± 2 kg). All subjects performed two sets of 10 sec. maximal isometric contractions of the Ab Wheel Rollout exercise keeping the knees fixed on the floor and the arms taut. To perform the exercise, all subjects were randomly assessed in the following three positions related to the angle between the arms and trunk, in random order: arms aligned vertically with the Ab Wheel Rollout exercise (neutral); 90º and 150º. A rest period of 5 minutes was provided between tests. The sEMG signals were recorded in the following muscles: Latissimus Dorsi; Pectoralis Major; Erector Spinae; Rectus Abdominis.

RESULTS:
There were significant increases in Rectus Abdominis muscle activity between: neutral vs. 90º, neutral vs. 150º and 90º vs. 150º. There was a significant increase in Pectoralis Major muscle activity between neutral x 150º.

CONCLUSION:
The present findings indicate that (a) Ab Wheel Rollout exercise emphasizes the muscle action of the Pectoralis Major and Rectus Abdominis more than the Latissimus Dorsi and Erector Spinae; (b) the level of muscle activation depends on the external force created by the body mass and lever arm from the center of mass.

Full text

1
Muscle Activation Pattern During Isometric Ab Wheel
Rollout Exercise in Dierent Shoulder Angle-Positions
Paulo Henrique MarchettiI,II, Brad J. SchoenfeldIII, Josinaldo Jarbas da SilvaI, Mauro Antonio GuiseliniI, Fabio Sisconeto
de FreitasI, Silvio Luiz PecoraroI, Willy Andrade GomesI, Charles Ricardo LopesI,IV
DOI: 10.5935/MedicalExpress.2015.04.04
ORIGINAL RESEARCH
I Methodist University of Piracicaba, Department of Human Movement Sciences, Piracicaba, São Paulo, Brazil
II University of São Paulo, School of Medicine, Institute of Orthopedics and Trauma-tology, Laboratory of Kinesiology, São Paulo, Brazil
III The City University of New York, Lehman College, Department of Health Sciences, Program of Exercise Science, Bronx, NY, USA.
IV Adven-tist Faculty of Hortolândia, Hortolândia, Brazil
OBJECTIVE: To investigate muscle activation of the shoulder extensors and trunk stabilizers by surface
electromyography (sEMG) activity during the isometric Ab Wheel Rollout exercise in dierent shoulder joint positions.
METHOD: We recruited 8 young, healthy, resistance trained men (age: 25 ± 3 years, height: 178 ± 5 cm, and total
body mass: 81 ± 2 kg). All subjects performed two sets of 10 sec. maximal isometric contractions of the Ab Wheel
Rollout exercise keeping the knees xed on the oor and the arms taut. To perform the exercise, all subjects were
randomly assessed in the following three positions related to the angle between the arms and trunk, in random
order: arms aligned vertically with the Ab Wheel Rollout exercise (neutral); 90° and 150°. A rest period of 5 minutes
was provided between tests. The sEMG signals were recorded in the following muscles: Latissimus Dorsi; Pectoralis
Major; Erector Spinae; Rectus Abdominis.
RESULTS: There were signicant increases in Rectus Abdominis muscle activity between: neutral x 90°, neutral x
150° and 90° x 150°. There was a signicant increase in Pectoralis Major muscle activity between neutral x 150°.
CONCLUSIONS: The present ndings indicate that (a) Ab Wheel Rollout exercise emphasizes the muscle action
of the Pectoralis Major and Rectus Abdominis more than the Latissimus Dorsi and Erector Spinae; (b) the level of
muscle activation depends on the external force created by the body mass and lever arm from the center of mass.
KEYWORDS: Biomechanics; Exercise performance; Functional exercise.
Marchetti PH, Schoenfeld BJ, Silva JJ, Guiselini MA, Freitas FS, Pecoraro SL, Gomes WA, Lopes CR. Muscle Activation Pattern During Isometric
Ab Wheel Rollout Exercise in Dierent Shoulder An-gle-Positions. MEDICALEXPRESS. 2015;2(4)M150404
Received for Publication on June 5, 2015; First review on June 25, 2015; Accepted for publication on July 7, 2015
E-mail: dr.pmarchetti@gmail.com
■ INTRODUCTION
Among the many different variables in resistance
training, exercise choice is one of the most important
for achieving the aims of the program.1 In addition, it
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exercise can generate mechanical and physiological
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MEDICALEXPRESS 2015 August;2(4):M150404 sEMG during Ab Wheel Rollout Exercise
Marchetti PH
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





    



    



    



 


  
  

  


Data analyses
   
 


   
  
 11  


   



exercise can be mechanically compared to the static prone

,19

 


    

commonly performed exercise. Therefore, the aim of the




■ METHODS
Subjects

data     
      
   20
   

 









Procedures




they reported to have refrained from performing any






3
MEDICALEXPRESS 2015 August;2(4):M150404sEMG during Ab Wheel Rollout Exercise
Marchetti PH
Figure 1 - Ab Wheel Rollout exercise: (A) neutral position; (B) 90 degrees position; and (C) 150 degrees position.
       
  


Statistical Analysis


 

  


  
23
     
      
  24

■ RESULTS
  
    
  p
p = 


p 
p 
p 
   
p 

■ DISCUSSION

 
    
Figure 2 - Mean ± standard deviation of the IEMG from Rectus Abdominis (Rectus
Abdominis), Erectus Spinae (ES), Pectoralis Major (Pectoralis Major) and Latissimus
Dorsi (Latissimus Dorsi) during isometric Ab Wheel Rollout exercise for dierent
extension shoulder angle-positions (neutral, 90 degrees and 150 degrees) * Signicant
dierence, p < 0.05.



21 In this position, the lever arm is minimal







   





   


by the body mass and lever arm from center of mass,
  
  

 

4
MEDICALEXPRESS 2015 August;2(4):M150404 sEMG during Ab Wheel Rollout Exercise
Marchetti PH



11

  
 

  
   
   
    
  

   
  

   


2519
Tong et al.   
  




  vs.   
2519
  
    
25
     vs. 10.23%
 
19
vs.

  





   
  
into program design.
■ CONCLUSION
 



   



by the body mass and lever arm from the center of mass.
■ ACKNOWLEDGEMENTS
 
(Laboratório 
■ AUTHOR CONTRIBUTIONS:
   

   
  


revision.
■ CONFLICT OF INTEREST
   

PADRÃO ISOMÉTRICO DE ATIVAÇÃO MUSCULAR
DURANTE O EXERCÍCIO AB WHEEL ROLLOUT EM
DIFERENTES POSIÇÕES DO COMPLEXO ARTICU
LAR DO OMBRO
OBJETIVO:

 

     
Ab Wheel Rollout.
MÉTODO:  


    
 Ab Wheel Rollout, e mantiveram



na vertical e alinhado ao eixo do Ab Wheel Rollout




RESULTADOS:    
  


5
MEDICALEXPRESS 2015 August;2(4):M150404sEMG during Ab Wheel Rollout Exercise
Marchetti PH
   


  



  

       


  




 











        
2013.
   
 


  






     


CONCLUSÕES:
Ab Wheel Rollout 



corporal e braço de alavanca do centro de massa.
PALAVRAS-CHAVE:

■ REFERENCES
  

 



   
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 
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
 
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  
 
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 
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  
      
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