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Cited by 43Muscle activation and electromyography studiesLower Extremity Biomechanics and PathologiesHip disorders and treatments

Influence of hip external rotation on hip adductor and rectus femoris myoelectric activity during a dynamic parallel squat

Pereira, Glauber Ribeiro, Leporace, Gustavo, Chagas, Daniel das Virgens, Furtado, Luis F L, Praxedes, Jomilto, Batista, Luiz A·2010·Journal of Strength and Conditioning Research
DOI 10.1519/jsc.0b013e3181c6a139
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Abstract

This study sought to compare the myoelectric activity of the hip adductors (HAs) and rectus femoris (RF) when the hip was in a neutral position or externally rotated by 30° or 50° (H0, H30, and H50, respectively) during a parallel squat. Ten healthy subjects performed 10 repetitions of squats in each of the 3 hip positions and the myoelectric activities of the HAs and RF were recorded. The signal was then divided into categories representing concentric (C) and eccentric (E) contractions in the following ranges of motion: 0-30° (C1 and E1), 30-60° (C2 and E2), and 60-90° (C3 and E3) of knee flexion. From those signals, an root mean square (RMS) value for each range of motion in each hip position was obtained. All values were normalized to those obtained during maximum voluntary isometric contraction. We found that HAs showed a significant increase in myoelectric activity during C3 and E3 in the H30 and H50 positions, as compared with H0. Meanwhile, RF activity did not significantly differ between hip positions. Both muscles showed higher activation during 60-90° (C3 and E3) of knee flexion, as compared with 0-30° (C1 and E1) and 30-60° (C2 and E2). The results suggest that if the aim is to increase HA activity despite the low percentage of muscle activation, squats should be performed with 30° of external rotation and at least 90° of knee flexion.

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Crossref · 10.1519/jsc.0b013e3181c6a139

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  • Compared to trunk inclination, inclination of the tibia during squatting has an opposite influence on the knee flexion moment.

    “Compared to trunk inclination, inclination of the tibia during squatting has an opposite influence on the knee flexion moment.9,10,16–18”

    From A Biomechanical Review of the Squat Exercise: Implications for Clinical Practice. (2024) · cites this paper as [16]

  • Moving the tibia from a more upright position to a more forward position shifts the knee joint center further away from the resultant ground reaction force vector, thereby increasing the knee flexion moment during squatting.

    “Moving the tibia from a more upright position (Figure 3A) to more forward position (Figure 3B) shifts the knee joint center further away from the resultant ground reaction force vector, thereby increasing the knee flexion moment.”

    From A Biomechanical Review of the Squat Exercise: Implications for Clinical Practice. (2024) · cites this paper as [16]

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Authors
Pereira, G. R., Leporace, G., Chagas, D. D. V., Furtado, L. F. L., Praxedes, J., & Batista, L. A.
Affiliations
Universidade Federal do Rio de Janeiro (BR)
Corresponding author
Pereira, Glauber Ribeiro
ORCID
Venue
Journal of Strength and Conditioning Research
Publisher
Ovid Technologies (Wolters Kluwer Health)
Published
2010-10
Volume
24
Issue
10
Pages
2749-2754
ISSN
1064-8011 (ISSN-L)
DOI
10.1519/jsc.0b013e3181c6a139
OpenAlex
W2079008576
Cited by
43
References
25
Citations by year
2026: 4 · 2025: 2 · 2024: 4 · 2022: 2 · 2021: 3 · 2020: 3 · 2019: 2 · 2018: 3 · 2017: 4 · 2016: 2 · 2015: 1 · 2014: 4 · 2013: 4 · 2012: 4
FWCI
1.70
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Strength and Conditioning Research (publishedVersion)
  • PubMed (publishedVersion)
  • Acervo Digital da Universidade Estadual Paulista (Universidade Estadual Paulista) (submittedVersion)
  • UNESP Institutional Repository (São Paulo State University) (submittedVersion)
Topics
  • Physical Sciences › Engineering › Biomedical Engineering › Muscle activation and electromyography studies
  • Physical Sciences › Engineering › Biomedical Engineering › Lower Extremity Biomechanics and Pathologies
  • Health Sciences › Medicine › Surgery › Hip disorders and treatments
Keywords
hip external rotation, hip adductor muscles, rectus femoris, muscle electrical activity, parallel squat, muscle activation, knee flexion range of motion, concentric and eccentric contraction, squat technique
MeSH terms
Electromyography, Female, Hip, Humans, Isometric Contraction, Male, Rotation, Weight Lifting, Range of Motion, Articular, Quadriceps Muscle, Young Adult

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