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Cited by 65Muscle activation and electromyography studiesLower Extremity Biomechanics and PathologiesKnee injuries and reconstruction techniques

The effect of knee and foot position on the electromyographical activity of the superficial quadriceps

Signorile, Joseph F., Kacsik, Denise, Perry, Arlette, Robertson, Bobby, Williams, Richard, Lowensteyn, Ilka, Digel, Sarah, Caruso, John +1 more·1995·Journal of Orthopaedic & Sports Physical Therapy
DOI 10.2519/jospt.1995.22.1.2
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Abstract

Isometric quadriceps exercises are used early in knee rehabilitation. Varying knee or foot position is hypothesized to selectively activate specific quadriceps muscles. This study examined the activities of the vastus medialis oblique, vastus lateralis, and rectus femoris during isometric contractions at 90 degrees, 150 degrees, and 175 degrees knee angles with internally rotated, neutral, and externally rotated foot positions. Subjects performed three perceived maximal isometric contractions at each knee angle/foot position while electromyographic activity (EMG) was collected. Statistical analysis consisted of a three-way repeated measures multiple analysis of variance, with post hoc analysis as was appropriate. Although no significant differences were detected among foot positions for the rectus femoris at 90 degrees, this knee angle produced significantly greater EMG activity for the neutral position compared with 150 degrees or 175 degrees. The 90 degrees angle was also superior to 175 degrees for the externally rotated position. The results for both the vastus medialis and vastus lateralis were similar, with the 90 degrees angle producing greater EMG activity than 175 degrees in the externally rotated position. In addition, the neutral position produced significantly more activity than the internally rotated position at 90 degrees. At 150 degrees, the neutral position was superior to the externally rotated position. Finally, at the 175 degrees knee angle, the highest level of EMG activity was with the foot internally rotated. Considering the combination of effects for EMG activity across all muscles tested, the 90 degrees knee angle with a neutral foot position may provide the most effective condition for rehabilitation of all muscles tested.(ABSTRACT TRUNCATED AT 250 WORDS)

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Crossref · 10.2519/jospt.1995.22.1.2

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  • Maintaining a neutral spine position increases the moment arm for the spinal extensors, thereby allowing better control of compressive loads and shear forces.

    “Maintaining a neutral spine position increases the moment arm for the spinal extensors thereby allowing better control of compressive loads and shear forces.14,15”

    From A Biomechanical Review of the Squat Exercise: Implications for Clinical Practice. (2024) · cites this paper as [15]

  • Attainment of a forward trunk position using lumbar spine flexion results in decreased tolerance to compressive loads and lumbar spine anterior shear forces compared to when forward trunk inclination is achieved with a neutral spine position.

    “Attainment of a forward trunk position using lumbar spine flexion (Figure 2A) results in decreased tolerance to compressive loads14 and lumber spine anterior shear forces as compared to when forward trunk inclination is achieved with a neutral spine position (Figure 2B).15”

    From A Biomechanical Review of the Squat Exercise: Implications for Clinical Practice. (2024) · cites this paper as [15]

  • Compressive and shear forces occur at the lumbar spine during squatting when posterior pelvic tilt is coupled with lumbar spine flexion.

    “Given that posterior pelvic tilt is coupled with lumbar spine flexion,37,38 compressive and shear forces occur at the lumbar spine.14,15,39”

    From A Biomechanical Review of the Squat Exercise: Implications for Clinical Practice. (2024) · cites this paper as [15]

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Authors
Signorile, J. F., Kacsik, D., Perry, A., Robertson, B., Williams, R., Lowensteyn, I., Digel, S., Caruso, J., & LeBlanc, W. G.
Affiliations
University of Miami (US)
ORCID
Venue
Journal of Orthopaedic & Sports Physical Therapy
Publisher
Journal of Orthopaedic & Sports Physical Therapy (JOSPT)
Published
1995-07
Volume
22
Issue
1
Pages
2-9
ISSN
  • 0190-6011 (ISSN-L)
  • 1938-1344
DOI
10.2519/jospt.1995.22.1.2
OpenAlex
W2068565275
Cited by
65
References
31
Citations by year
2025: 1 · 2024: 3 · 2023: 2 · 2021: 3 · 2020: 1 · 2019: 3 · 2018: 3 · 2017: 2 · 2016: 2 · 2015: 1 · 2014: 3 · 2013: 3 · 2012: 3
FWCI
1.54
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Orthopaedic and Sports Physical Therapy (publishedVersion)
  • PubMed (publishedVersion)
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 › Knee injuries and reconstruction techniques
Keywords
quadriceps, knee rehabilitation, isometric contraction, knee joint angle, foot position, vastus medialis oblique, vastus lateralis, rectus femoris, muscle activation, electromyography, knee rotation
MeSH terms
Adolescent, Adult, Analysis of Variance, Electromyography, Female, Foot, Humans, Isometric Contraction, Knee, Male, Posture, Rotation, Thigh, Muscle, Skeletal

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