Effect of Foot Position on the Electromyographical Activity of the Superficial Quadriceps Muscles During the Parallel Squat and Knee Extension

Signorile, Joseph F.; Kwiatkowski, K.; Caruso, John F.; Robertson, Bobby

doi:10.1519/1533-4287(1995)009<0182:eofpot>2.3.co;2

Cited by 20 publications

(9 citation statements)

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“…If relying on interpretation of effect size estimates, then the differences observed across conditions may be considered small. It is interesting to note in this respect that previous investigations concerned with assessment of superficial thigh musculature activity during weighted squat exercise with either different stance widths or foot rotations have, in general, not found differences across conditions (Boyden et al, 2000;McCaw & Melrose, 1999;Paoli et al, 2009;Singorile et al, 1995). If extrapolating these latter findings to the current investigation, then our interpretation regarding the insignificance of the proposed modifications for enhancing aspects of thigh musculature conditioning is supported.…”

Section: Discussionsupporting

confidence: 70%

“…Although the squat is a multijoint movement involving the recruitment of several muscle groups (Flanagan et al, 2003;Gullett et al, 2009;Schoenfeld, 2010), much of the literature pertaining to the biomechanical description of the exercise is concerned with alterations to knee joint mechanics and associated muscular activity (Escamilla, 2001a). In this respect, particular attention has been paid to modifications of the initial stance width and foot rotation angle adopted by the trainee (Boyden, et al, 2000;Escamilla et al, 2001b,c;McCaw & Melrose, 1999;Ninos et al, 1997;Paoli et al, 2009;Singorile et al, 1995). However, the majority of investigations concerned with quantifying the effects of the aforementioned modifications on knee kinetics have primarily used two-dimensional sagittal analyses, with the efforts themselves performed with various magnitudes of external resistance.…”

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confidence: 99%

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Three-Dimensional Knee Joint Moments During Performance of the Bodyweight Squat: Effects of Stance Width and Foot Rotation

Almosnino

Kingston

Graham

2013

Journal of Applied Biomechanics

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The purpose of this investigation was to assess the effects of stance width and foot rotation angle on three-dimensional knee joint moments during bodyweight squat performance. Twenty-eight participants performed 8 repetitions in 4 conditions differing in stance or foot rotation positions. Knee joint moment waveforms were subjected to principal component analysis. Results indicated that increasing stance width resulted in a larger knee flexion moment magnitude, as well as larger and phase-shifted adduction moment waveforms. The knee’s internal rotation moment magnitude was significantly reduced with external foot rotation only under the wide stance condition. Moreover, squat performance with a wide stance and externally rotated feet resulted in a flattening of the internal rotation moment waveform during the middle portion of the movement. However, i is speculated that the differences observed across conditions are not of clinical relevance for young, healthy participants.

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Section: Discussionsupporting

confidence: 70%

mentioning

confidence: 99%

Three-Dimensional Knee Joint Moments During Performance of the Bodyweight Squat: Effects of Stance Width and Foot Rotation

Almosnino

Kingston

Graham

2013

Journal of Applied Biomechanics

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“…The participants were taught, and were allowed to briefly practice, the onelegged WS and the SM (Life Extension Systems, Kalamazoo, MI) exercise. Participants adopted a position of tibial rotation that was comfortable for them (8,12); hip and knee motion were required to approximate the sagittal plane. After a 1-rnin rest period, the participants performed a series of five repetitions in each of four positions on the SM or WS.…”

Section: Methodsmentioning

confidence: 99%

Changes in Muscle Activation during Wall Slides and Squat-Machine Exercise

Blanpied¹

1999

Journal of Sport Rehabilitation

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Closed kinetic chain exercises are commonly used in strengthening and rehabilitation programs. Altering positions of body segments and supports might affect the way these exercises are performed. The purpose of this study was to compare gluteal, quadriceps, hamstring, and plantar flexor muscle activations during wall-slide (WS) vs. squat-machine (SM) exercise. In addition, the effects of support location and foot position were investigated. Twenty women performed 8 exercises, to 60° of knee flexion. Results indicated that placing the foot forward caused an increase in all muscle activations except in the plantar flexors, which showed an increase with the foot placed in line with the hip. This effect was exaggerated during WS for the plantar flexors and quadriceps and during SM for the hamstrings. When the support was located at the scapular level, hamstring and gluteal activations were greater, and quadriceps activity was less during SM than during WS. These results could be used to target specific muscle groups during strengthening exercise.

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“…The enhancement of the activity of specific muscles with different exercise variants and different ranges of motion have been extensively examined for both the lower limb muscles ( Boyden, Kingman & Dyson, 2000 ; Paoli, Marcolin & Petrone, 2009 ; Signorile, Kwiatkowski & Caruso, 1995 ) and trunk muscles ( Lehman, 2005 ; Lusk, Hale & Russell, 2005 ; Marcolin et al, 2015 ; Paoli, Marcolin & Petrone, 2010 ; Signorile, Zink & Szwed, 2002 ). Nevertheless, few studies have investigated the EMG activity of the arm and forearm muscles while performing resistance exercises ( Oliveira & Gonçalves, 2009 ; Oliveira et al, 2009 ).…”

Section: Discussionmentioning

confidence: 99%

“…These training approaches have been investigated in both lower and upper body exercises which target specific muscle groups. For instance, the effect of feet position on the electromyographic (EMG) activity of quadriceps muscles has been previously reported ( Boyden, Kingman & Dyson, 2000 ; Signorile, Kwiatkowski & Caruso, 1995 ), as well as the effect of stance width on the activity of the gluteus maximus during a back squat ( Paoli, Marcolin & Petrone, 2009 ). In addition, EMG of the shoulder and trunk muscles during different variations of the lat pull down exercise was investigated ( Lusk, Hale & Russell, 2005 ; Signorile, Zink & Szwed, 2002 ), showing that maximal activation of the latissimus dorsi was obtained when performing the exercise with an anterior wide grip.…”

Section: Introductionmentioning

confidence: 99%

Differences in electromyographic activity of biceps brachii and brachioradialis while performing three variants of curl

Marcolin

Panizzolo

Petrone

et al. 2018

PeerJ

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BackgroundDumbbell curl (DC) and barbell curl in its two variants, straight (BC) or undulated bar (EZ) are typical exercises to train the elbow flexors. The aim of the study was to verify if the execution of these three variants could induce a selective electromyographic (EMG) activity of the biceps brachii (BB) and brachioradialis (BR).MethodsTwelve participants performed one set of ten repetitions at 65% of their 1-RM for each variant of curl. Pre-gelled electrodes were applied with an inter-electrode distance of 24 mm on BB and BR. An electrical goniometer was synchronously recorded with EMG signals to determine the concentric and eccentric phases of each variant of curl.ResultsWe detected higher activation profile of both BB (P < 0.05) and BR (P < 0.01) during the EZ compared to the DC. Higher levels of activation was found during the concentric phase for only the BR performed with an EZ compared to DC (P < 0.001) and performing BC compared to DC (P < 0.05). The eccentric phase showed a higher activation of the BB muscle in EZ compared to DC (P < 0.01) and in BC compared to DC (P < 0.05). The BR muscle showed a higher activation performing EZ compared to DC (P < 0.01).DiscussionThe EZ variant may be preferred over the DC variant as it enhances BB and BR EMG activity during the whole range of motion and only in the eccentric phase. The small difference between BC and EZ variants of the BB and BR EMG activity makes the choice between these two exercises a matter of subjective comfort.

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Effect of Foot Position on the Electromyographical Activity of the Superficial Quadriceps Muscles During the Parallel Squat and Knee Extension

Cited by 20 publications

References 0 publications

Three-Dimensional Knee Joint Moments During Performance of the Bodyweight Squat: Effects of Stance Width and Foot Rotation

Three-Dimensional Knee Joint Moments During Performance of the Bodyweight Squat: Effects of Stance Width and Foot Rotation

Changes in Muscle Activation during Wall Slides and Squat-Machine Exercise

Differences in electromyographic activity of biceps brachii and brachioradialis while performing three variants of curl

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