An Examination of Muscle Activation and Power Characteristics While Performing the Deadlift Exercise with Straight and Hexagonal Barbells

Camara, Kevin D.; Coburn, Jared W.; Dunnick, Dustin D.; Brown, Lee E.; Galpin, Andrew J.; Costa, Pablo B.

doi:10.1249/01.mss.0000486413.06515.da

Cited by 5 publications

(6 citation statements)

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“…This allows for a more upright posture where the hip joint is closer to the trajectory line of the weights, reducing the resistive torque about the hip joint. Accordingly, Swinton et al (20) reported lower peak moments in the lumbar spine for hex bar-versus barbell deadlift, and Camara et al (4) observed that the barbell deadlift to a greater extent activated the biceps femoris and the erector spinae. However, these studies did not asses muscle activation of the prime hip extensor gluteus maximus muscle.…”

Section: A C C E P T E D Introductionmentioning

confidence: 99%

Electromyographic Comparison of Barbell Deadlift, Hex Bar Deadlift, and Hip Thrust Exercises: A Cross-Over Study

Andersen¹,

Fimland

Mo³

et al. 2018

Journal of Strength and Conditioning Research

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Andersen, V, Fimland, MS, Mo, D-A, Iversen, VM, Vederhus, T, Rockland Hellebø, LR, Nordaune, KI, and Saeterbakken, AH. Electromyographic comparison of barbell deadlift, hex bar deadlift, and hip thrust exercises: a cross-over study. J Strength Cond Res 32(3): 587-593, 2018-The aim of the study was to compare the muscle activation level of the gluteus maximus, biceps femoris, and erector spinae in the hip thrust, barbell deadlift, and hex bar deadlift; each of which are compound resisted hip extension exercises. After 2 familiarization sessions, 13 resistance-trained men performed a 1 repetition maximum in all 3 exercises in 1 session, in randomized and counterbalanced order. The whole ascending movement (concentric phase), as well as its lower and upper parts (whole movement divided in 2), were analyzed. The hip thrust induced greater activation of the gluteus maximus compared with the hex bar deadlift in the whole (16%, p = 0.025) and the upper part (26%, p = 0.015) of the movement. For the whole movement, the biceps femoris was more activated during barbell deadlift compared with both the hex bar deadlift (28%, p < 0.001) and hip thrust (20%, p = 0.005). In the lower part of the movement, the biceps femoris activation was, respectively, 48% and 26% higher for the barbell deadlift (p < 0.001) and hex bar deadlift (p = 0.049) compared with hip thrust. Biceps femoris activation in the upper part of the movement was 39% higher for the barbell deadlift compared with the hex bar deadlift (p = 0.001) and 34% higher for the hip thrust compared with the hex bar deadlift (p = 0.002). No differences were displayed for the erector spinae activation (p = 0.312-0.859). In conclusion, the barbell deadlift was clearly superior in activating the biceps femoris compared with the hex bar deadlift and hip thrust, whereas the hip thrust provided the highest gluteus maximus activation.

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Section: A C C E P T E D Introductionmentioning

confidence: 99%

Electromyographic Comparison of Barbell Deadlift, Hex Bar Deadlift, and Hip Thrust Exercises: A Cross-Over Study

Andersen¹,

Fimland

Mo³

et al. 2018

Journal of Strength and Conditioning Research

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“…Specific to law enforcement recruits and officers, the adoption of training exercises that stress the QUAD could be useful in training to enhance their ability to complete dragging tasks. Some examples include deadlifts with a conventional or hexagonal bar (Camara et al, 2016) and sled drags (Jenkins & Palmer, 2012). The ability for the QUAD to tolerate load during a dragging task especially important to develop, given the heavier citizens (Fryar et al, 2016) or colleagues (Dawes et al, 2017b;Lockie et al, 2019c) LEOs may encounter during their shift.…”

Section: Discussionmentioning

confidence: 99%

Training Load Demands Measured by Surface Electromyography Wearable Technology When Performing Law Enforcement-Specific Body Drags

et al. 2020

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The use of surface electromyography (sEMG) wearable technology to measure training load (TL) during law enforcement-specific tasks (e.g. a body drag) requires investigation. This study determined muscle activation differences represented as TL during a 9.75-m drag with 74.84 kg and 90.72 kg dummies. Eight men and three women were fitted with a compression short or legging embedded with sEMG wearable technology to measure the quadriceps (QUAD; vastus medialis+vastus lateralis), biceps femoris (BF), and gluteus maximus (GM). After fitting on day one, participants completed maximal voluntary isometric contractions for each muscle to normalize the sEMG signal and calculate TL units. On days two and three, participants performed a 9.75 m body drag using either the 74.84 kg or the 90.72 kg dummy while wearing the technology. Participants lifted the dummy off the floor to a standing position and dragged it as quickly as possible over 9.75 m. Paired samples t-tests calculated between-drag differences for: time; QUAD, BF, GM, and total TL; and QUAD-BF, GM-BF, anterior-posterior (QUAD-GM+BF) ratios. QUAD TL was 9% greater (p=0.035), and GM TL was 8% lower (p=0.043), in the 90.72 kg body drag compared to the 74.84 kg drag. There were no between-mass differences in time, BF TL, total TL, or the ratios. QUAD TL increased while GM TL decreased when participants dragged a 90.72 kg dummy. As drag time was not different between the masses, drag mechanics may have changed leading to increased QUAD TL. sEMG wearable technology could be a useful method to measure TL in law enforcement-specific dragging tasks.

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“…First, the participants ran for 5 minutes on a treadmill (SALTER RS-30, Salter SA) at an intensity of around 40% of their heart rate reserve, followed by a dynamic warm-up comprising free weight lunges and squats. 7,12 After that, they performed 6 repetitions of the leg press exercise with light loads (<60 kg). 9 Then, their skin was cleaned with a 96% alcohol solution applied with cottonwool and the electrodes were placed over the VMO, VL, RF, and GMED muscles on the right limb, along with an electrogoniometer over the right knee joint, in accordance with the Surface Electromyography for the Non-invasive Assessment of Muscles guidelines.…”

Section: Methodsmentioning

confidence: 99%

“…Data on the maximum voluntary activation of the targeted muscles were collected during the 1RM measurement since dynamic assessment of muscle effort has been established as a better predictor of the highest muscle activation. 7,8 Peak activation (µV) recorded at 1-second interval windows and the highest sEMG activity level at a 100-ms interval were used to obtain the maximum voluntary contraction (MVC) of each muscle to normalize the sEMG signal. 4,33,34 The sEMG muscle activation of the MVC showed an intraclass correlation coefficient (ICC) greater than 0.9, demonstrating high reliability in all the MVCs evaluated.…”

Section: Methodsmentioning

confidence: 99%

Influence of Feet Position and Execution Velocity on Muscle Activation and Kinematic Parameters During the Inclined Leg Press Exercise

Martín-Fuentes

Oliva-Lozano

Muyor

2021

Sports Health: A Multidisciplinary Approach

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Background: The leg press is one of the most typical exercises for strengthening the lower limbs. The objectives of this study were to compare 5 inclined leg press exercise conditions, varying the feet width stance (100% or 150% hip width), the feet rotation (0° or 45° external rotation) on the footplate and using 2 different movement velocities (MVs; maximum intended, and 2:2 seconds steady-paced velocities) to determine their effect on muscle activation as well as on the kinematic parameters between trained men and trained women. Hypotheses: There will be no significant differences in muscle activation with regard to the feet position. The higher the MV, the greater the muscle activation. Study Design: A cross-sectional cohort study. Level of Evidence: Level 3. Methods: A repeated-measures between-group design was performed to examine muscle activation and kinematic parameters for the different conditions between gender groups. The level of significance was set at alpha = 0.05 for all statistical analyses. Results: Muscle activation presented no differences between conditions regarding feet width stance or feet rotation. Furthermore, muscle activation was greater during positive phases than negative phases of the exercise for all conditions and was also greater under maximum intended velocity conditions compared with steady-paced conditions. Otherwise, the muscle activation pattern presented slight differences by gender. In men, the greatest muscle activation was for the vastus medialis, followed by the vastus lateralis (VL), rectus femoris (RF), and gluteus medialis (GMED), while in women, the greatest muscle activation was for the vastus medialis, followed by the RF, VL, and GMED. Finally, greater mean propulsive velocity, maximum velocity, maximum power, and footplate displacement values were reported for men than for women under all the conditions. Conclusion: The inclined leg press exercise produces the highest muscle activation in the vastus medialis, regardless of the velocity, feet stance, or gender. Clinical Relevance: Given that there are no differences in muscle activation regarding the feet stance, a participant’s preferred feet stance should be encouraged during the inclined leg press exercise. Furthermore, the MV would preferably depend on the session objective (a training or a rehabilitation program), being aware that there is greater muscle activation at higher speeds. The inclined leg press exercise could be performed as a closed kinetic chain exercise when the main objective is to activate the vastus medialis.

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An Examination of Muscle Activation and Power Characteristics While Performing the Deadlift Exercise with Straight and Hexagonal Barbells

Cited by 5 publications

References 0 publications

Electromyographic Comparison of Barbell Deadlift, Hex Bar Deadlift, and Hip Thrust Exercises: A Cross-Over Study

Electromyographic Comparison of Barbell Deadlift, Hex Bar Deadlift, and Hip Thrust Exercises: A Cross-Over Study

Training Load Demands Measured by Surface Electromyography Wearable Technology When Performing Law Enforcement-Specific Body Drags

Influence of Feet Position and Execution Velocity on Muscle Activation and Kinematic Parameters During the Inclined Leg Press Exercise

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