COMPARISON OF EMG ACTIVITY OF KNEE EXTENSOR AND FLEXOR MUSCLES IN TWO DIFFERENT TYPES OF SQUAT MOVEMENT

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MOHEBI H.; NOURASTEH A.A.; FARAAHANI H.

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Journal: OLYMPIC Year:2009 | Volume:17 | Issue:2 (SERIAL 46) Page(s): 7-16

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Title

COMPARISON OF EMG ACTIVITY OF KNEE EXTENSOR AND FLEXOR MUSCLES IN TWO DIFFERENT TYPES OF SQUAT MOVEMENT

Author(s)

MOHEBI H. | NOURASTEH A.A. | FARAAHANI H. | Issue Writer Certificate

Keywords

STRENGTH TRAININGQ2

ELECTROMYOGRAPHYQ2

SQUAT MOVEMENTQ3

VASTUS MEDIALISQ3

VASTUS LATERALIS AND BICEPS FEMORISQ3

Abstract

The purpose of the study was to investigate the effect of foot position on EMG activity of the knee extensor and flexor muscles during a SQUAT MOVEMENT. Eight experienced power lifters, aged 22.38±3.74 yr, height 172.5±6.28em, and weight 91.95±9.98kg (Mean±SD), participated in this study as subjects. The subjects performed three 4-s maximal voluntary isometric contractions (MVIC), to normalize the EMG data for each of the two muscle groups. Then, the EMG activity of vastus medial is, vastus lateral is and biceps femoris were measured during three consecutive repetitions of the squat using narrow (65% shoulder width), and wide (160% shoulder width) stance, with a barbell weight equal to 100% subjects' body weight. A two way repeated measures ANOVA (2foot positions x 2squat phases) was, performed to compare normalized EMG (% MVIC) values during each phase (eccentric and concentric)of the two foot positions. Results indicated that VASTUS MEDIALIS activity was greater in the wide foot position with 42.41±16.38% MVIC compared to the narrow foot position with 38.09±14.73% MVIC (P£0.05). In addition, all muscles showed greater activity during the concentric phase when compared with the eccentric phase (P£0.05). No significant differences were found between any combinations of foot positions and squat phases. In conclusion, the results of this study showed that wide stance squat, may be more effective than narrow stance squat in recruiting the VASTUS MEDIALIS.These results may have clinical and sport applications, because vasti activity is very important in knee rehabilitation and training programs, especially the VASTUS MEDIALIS.

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APA: Copy

MOHEBI, H., NOURASTEH, A.A., & FARAAHANI, H.. (2009). COMPARISON OF EMG ACTIVITY OF KNEE EXTENSOR AND FLEXOR MUSCLES IN TWO DIFFERENT TYPES OF SQUAT MOVEMENT. OLYMPIC, 17(2 (SERIAL 46)), 7-16. SID. https://sid.ir/paper/37859/en

Vancouver: Copy

MOHEBI H., NOURASTEH A.A., FARAAHANI H.. COMPARISON OF EMG ACTIVITY OF KNEE EXTENSOR AND FLEXOR MUSCLES IN TWO DIFFERENT TYPES OF SQUAT MOVEMENT. OLYMPIC[Internet]. 2009;17(2 (SERIAL 46)):7-16. Available from: https://sid.ir/paper/37859/en

IEEE: Copy

H. MOHEBI, A.A. NOURASTEH, and H. FARAAHANI, “COMPARISON OF EMG ACTIVITY OF KNEE EXTENSOR AND FLEXOR MUSCLES IN TWO DIFFERENT TYPES OF SQUAT MOVEMENT,” OLYMPIC, vol. 17, no. 2 (SERIAL 46), pp. 7–16, 2009, [Online]. Available: https://sid.ir/paper/37859/en

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