Journal of
Physical Education and Sport Management

  • Abbreviation: J. Phys. Educ. Sport Manag.
  • Language: English
  • ISSN: 2141-6486
  • DOI: 10.5897/JPESM
  • Start Year: 2010
  • Published Articles: 75

Full Length Research Paper

Optimization proposal for squatting exercise: An EMG analysis

Felipe Sampaio-Jorge1,2, Máira Regina Rodrigues3, Márcio Magini3*, Rafael Pereira de Paula4 and Roosevelt Silva5
1Institutos Superiores de Ensino do Centro Educacional Nossa Senhora Auxiliadora (ISECENSA), Centro, Campos dos Goytacazes, Rio de Janeiro, Brazil. 2Universidade do Vale do Paraíba, São José dos Campos, São Paulo, Brazil. 3Universidade Federal Fluminense, Polo Universitário de Rio das Ostras, Riodas Ostras, Rio de Janeiro, Brazil”.. 4Department of Biological Sciences, Universidade Estadual do Sudoeste da Bahia (UESB), Jequié, Bahia, Brazil. 5Universidade Federal de Goiás, Jataí, Goiás, Brazil.
Email: [email protected]

  •  Accepted: 13 July 2011
  •  Published: 31 August 2011



This study aims to evaluate the behavior of the neuromuscular muscle groups (rectus femoris and soleus) during the execution of the squat exercise in two different protocols under varying floor angles. To quantify the muscle recruitment during exercise, surface electromyography was used with the following conditions:Free Squats, Squats with Swiss Ball support and three different floors’ positions: standard, decline (45of plantarflexion) and ascent (30of dorsiflexion). Ten healthy men were subjected to all possibilities for the exercise totaling six variations. EMG data were obtained from rectus femoris and soleus muscles bilaterally and the results of the data collection were determined by calculating the Root Mean Square (RMS). It was observed that higher values of RMS for the squat exercise on the proposed terms were obtained when the angle of the floor was at a sloping position.This result raises the possibility of choosing between the two proposed protocols, the one that is most appropriate for the patient in a specific condition, thereby generating a gain of muscle mass or strength, depending on the goals of rehabilitation.


Key words: Quadriceps, surface EMG, recruitment, squat.