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Journal articles on the topic 'Hip Muscle Activation'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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1

Liu, Yali, Ligang Qiang, Qiuzhi Song, Mingsheng Zhao, and Xinyu Guan. "Effects of Backpack Loads on Leg Muscle Activation during Slope Walking." Applied Sciences 10, no. 14 (2020): 4890. http://dx.doi.org/10.3390/app10144890.

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Hikers and soldiers usually walk up and down slopes with a load carriage, causing injuries of the musculoskeletal system, especially during a prolonged load journey. The slope walking has been reported to lead to higher leg extensor muscle activities and joint moments. However, most of the studies investigated muscle activities or joint moments during slope walking without load carriage or only investigated the joint moment changes and muscle activities with load carriages during level walking. Whether the muscle activation such as the signal amplitude is influenced by the mixed factor of load

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Sutherlin, Mark A., and Joseph M. Hart. "Hip-Abduction Torque and Muscle Activation in People With Low Back Pain." Journal of Sport Rehabilitation 24, no. 1 (2015): 51–61. http://dx.doi.org/10.1123/jsr.2013-0112.

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Context:Individuals with a history of low back pain (LBP) may present with decreased hip-abduction strength and increased trunk or gluteus maximus (GMax) fatigability. However, the effect of hip-abduction exercise on hip-muscle function has not been previously reported.Objective:To compare hip-abduction torque and muscle activation of the hip, thigh, and trunk between individuals with and without a history of LBP during repeated bouts of side-lying hip-abduction exercise.Design:Repeated measures.Setting:Clinical laboratory.Participants:12 individuals with a history of LBP and 12 controls.Inter

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Karahan, Menekşe, and Bülent Sabri Cığalı. "Assessment of hip muscles by surface EMG in gait analysis." Anatomy 14, no. 2 (2020): 86–90. http://dx.doi.org/10.2399/ana.20.039.

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Objectives: The rectus femoris muscle flexes the thigh, while the gluteus maximus muscle extends it. Understanding the activations of these two muscles that function in opposition to each other during walking facilitates the interpretation of gait pathologies. The aim of this study was to evaluate the activations of these muscles during walking by using the surface electromyography (EMG) technique. Methods: Twenty female volunteers aged 18–26 years participated in our study. The electrical activation of the rectus femoris and gluteus maximus muscles of the participants was simultaneously evalu

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Lewis, Cara L., and Shirley A. Sahrmann. "Muscle Activation and Movement Patterns During Prone Hip Extension Exercise in Women." Journal of Athletic Training 44, no. 3 (2009): 238–48. http://dx.doi.org/10.4085/1062-6050-44.3.238.

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Abstract Context: The consistency of muscle activation order during prone hip extension has been debated. Objective: To investigate whether women use a consistent and distinguishable muscle activation order when extending the hip while prone and to explore the effects of verbal cues on muscle activation and movement. Design: Single-session, repeated-measures design. Setting: University laboratory. Patients or Other Participants: Eleven healthy women (age = 27.7 ± 6.2 years [range, 22–37 years]). Intervention(s): We tested the participants under 3 conditions: no cues, cues to contract the glute

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Boudreau, Samantha N., Maureen K. Dwyer, Carl G. Mattacola, Christian Lattermann, Tim L. Uhl, and Jennifer Medina McKeon. "Hip-Muscle Activation during the Lunge, Single-Leg Squat, and Step-Up-and-Over Exercises." Journal of Sport Rehabilitation 18, no. 1 (2009): 91–103. http://dx.doi.org/10.1123/jsr.18.1.91.

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Context:Functional exercises are often used in strengthening programs after lower extremity injury. Activation levels of the stabilizing hip muscles have not been documented.Objective:To document the progression of hip-muscle activation levels during 3 lower extremity functional exercises.Design:Cross-sectional.Setting:Laboratory.Participants:44 healthy individuals, 22 women and 22 men.Intervention:Subjects, in 1 testing session, completed 3 trials each of the lunge (LUN), single-leg squat (SLSQ), and step-up-and-over (SUO) exercise.Main Outcome Measures:Root-mean-square muscle amplitude (% re

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Stanek, Justin M., Todd A. McLoda, Val J. Csiszer, and A. J. Hansen. "Hip- and Trunk-Muscle Activation Patterns During Perturbed Gait." Journal of Sport Rehabilitation 20, no. 3 (2011): 287–95. http://dx.doi.org/10.1123/jsr.20.3.287.

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Context:Selected muscles in the kinetic chain may help explain the body’s ability to avert injury during unexpected perturbation.Objective:To determine the activation of the ipsilateral rectus femoris (RF), gluteus maximus (MA), gluteus medius (ME), and contralateral external obliques (EO) during normal and perturbed gait.Design:Single-factor, repeated measures.Setting:University research laboratory.Participants:32 physically active, college-age subjects.Intervention:Subjects walked a total of 20 trials the length of a 6.1-m custom runway capable of releasing either side into 30° of unexpected

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Jeong, Jiyoung, Dai-Hyuk Choi, and Choongsoo S. Shin. "Core Strength Training Can Alter Neuromuscular and Biomechanical Risk Factors for Anterior Cruciate Ligament Injury." American Journal of Sports Medicine 49, no. 1 (2020): 183–92. http://dx.doi.org/10.1177/0363546520972990.

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Background: Core stability is influential in the incidence of lower extremity injuries, including anterior cruciate ligament (ACL) injuries, but the effects of core strength training on the risk for ACL injury remain unclear. Hypothesis: Core muscle strength training increases the knee flexion angle, hamstring to quadriceps (H:Q) coactivation ratio, and vastus medialis to vastus lateralis (VM:VL) muscle activation ratio, as well as decreases the hip adduction, knee valgus, and tibial internal rotation angles. Study Design: Controlled laboratory study. Methods: A total of 48 male participants w

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Wade, Logan, Glen A. Lichtwark, and Dominic J. Farris. "Joint and muscle-tendon coordination strategies during submaximal jumping." Journal of Applied Physiology 128, no. 3 (2020): 596–603. http://dx.doi.org/10.1152/japplphysiol.00293.2019.

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Previous research has demonstrated that during submaximal jumping humans prioritize reducing energy consumption by minimizing countermovement depth. However, sometimes movement is constrained to a nonpreferred pattern, and this requires adaptation of neural control that accounts for complex interactions between muscle architecture, muscle properties, and task demands. This study compared submaximal jumping with either a preferred or a deep countermovement depth to examine how joint and muscle mechanics are integrated into the adaptation of coordination strategies in the deep condition. Three-d

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Prosser, Laura A., Samuel C. K. Lee, Ann F. VanSant, Mary F. Barbe, and Richard T. Lauer. "Trunk and Hip Muscle Activation Patterns Are Different During Walking in Young Children With and Without Cerebral Palsy." Physical Therapy 90, no. 7 (2010): 986–97. http://dx.doi.org/10.2522/ptj.20090161.

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Background Poor control of postural muscles is a primary impairment in people with cerebral palsy (CP). Objective The purpose of this study was to investigate differences in the timing characteristics of trunk and hip muscle activity during walking in young children with CP compared with children with typical development (TD). Methods Thirty-one children (16 with TD, 15 with CP) with an average of 28.5 months of walking experience participated in this observational study. Electromyographic data were collected from 16 trunk and hip muscles as participants walked at a self-selected pace. A custo

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O’Dwyer, Catriona, David Sainsbury, and Kieran O’Sullivan. "Gluteus Medius Muscle Activation During Isometric Muscle Contractions." Journal of Sport Rehabilitation 20, no. 2 (2011): 174–86. http://dx.doi.org/10.1123/jsr.20.2.174.

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Context:Functional subdivisions are proposed to exist in the gluteus medius (GM) muscle. Dysfunction of the GM, in particular its functional subdivisions, is commonly implicated in lower limb pathologies. However, there is a lack of empirical evidence examining the role of the subdivisions of the GM.Objectives:To compare the activation of the functional subdivisions of the GM (anterior, middle, and posterior) during isometric hip contractions.Design:Single-session, repeated-measures observational study.Setting:University research laboratory.Participants:Convenience sample of 15 healthy, pain-f

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Suter, Esther, Walter Herzog, and Robert Bray. "Quadriceps Activation during Knee Extension Exercises in Patients with ACL Pathologies." Journal of Applied Biomechanics 17, no. 2 (2001): 87–102. http://dx.doi.org/10.1123/jab.17.2.87.

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This study assessed muscle inhibition in patients with chronic anterior cruciate ligament (ACL) deficiency or ACL reconstruction. A series of protocols were tested for their effectiveness in increasing activity of the individual knee extensor muscles and decreasing muscle inhibition of the whole quadriceps group. Quadriceps muscle inhibition was measured by superimposing an electrical twitch onto the quadriceps muscle during a maximal voluntary knee extension. The level of activation of the individual knee extensor and knee flexor muscles was assessed via electromyography (EMG). Patients with

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Padua, Darin A., David R. Bell, and Micheal A. Clark. "Neuromuscular Characteristics of Individuals Displaying Excessive Medial Knee Displacement." Journal of Athletic Training 47, no. 5 (2012): 525–36. http://dx.doi.org/10.4085/1062-6050-47.5.10.

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Context Knee-valgus motion is a potential risk factor for certain lower extremity injuries, including anterior cruciate ligament injury and patellofemoral pain. Identifying neuromuscular characteristics associated with knee-valgus motion, such as hip and lower leg muscle activation, may improve our ability to prevent lower extremity injuries. Objective We hypothesized that hip and lower leg muscle-activation amplitude would differ among individuals displaying knee valgus (medial knee displacement) during a double-legged squat compared with those who did not display knee valgus. We further sugg

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Lee, Ji-hyun, Heon-seock Cynn, Sil-ah Choi, Tae-lim Yoon, and Hyo-jung Jeong. "Effects of Different Hip Rotations on Gluteus Medius and Tensor Fasciae Latae Muscle Activity During Isometric Side-Lying Hip Abduction." Journal of Sport Rehabilitation 22, no. 4 (2013): 301–7. http://dx.doi.org/10.1123/jsr.22.4.301.

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Context:Gluteus medius (Gmed) weakness is associated with some lower-extremity injuries. People with Gmed weakness might compensate by activating the tensor fasciae latae (TFL). Different hip rotations in the transverse plane may affect Gmed and TFL muscle activity during isometric side-lying hip abduction (SHA).Objectives:To compare Gmed and TFL muscle activity and the Gmed:TFL muscle-activity ratio during SHA exercise with 3 different hip rotations.Design:The effects of different hip rotations on Gmed, TFL, and the Gmed:TFL muscle-activity ratio during isometric SHA were analyzed with 1-way,

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Hagio, Shota, and Motoki Kouzaki. "The flexible recruitment of muscle synergies depends on the required force-generating capability." Journal of Neurophysiology 112, no. 2 (2014): 316–27. http://dx.doi.org/10.1152/jn.00109.2014.

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To simplify redundant motor control, the central nervous system (CNS) may modularly organize and recruit groups of muscles as “muscle synergies.” However, smooth and efficient movements are expected to require not only low-dimensional organization, but also flexibility in the recruitment or combination of synergies, depending on force-generating capability of individual muscles. In this study, we examined how the CNS controls activations of muscle synergies as changing joint angles. Subjects performed multidirectional isometric force generations around right ankle and extracted the muscle syne

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Aali, Shirin, and Shahabeddin Bagheri. "Effect of iliopsoas muscle tightness on electromyographic activity of hip extensor synergists during gait." Medical Journal of Tabriz University of Medical Sciences and Health Services 43, no. 1 (2021): 76–83. http://dx.doi.org/10.34172/mj.2021.031.

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Background: Hip flexor muscles' tightness has been considered as one of the main risk factors for neuromuscular impairment of lower extremities not only lead to change the movement patterns but also probably result in changing the neuromuscular features of other muscles. The purpose of this research is study was to evaluate the iliopsoas tightness’ effect on electromyographic activity of hip extensor synergists during gait. Methods: In this case-control study fifteen 11-14 years old adolescents with iliopsoas tightness as experimental group, and 15 healthy adolescents which matched based on ag

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Nguyen, Anh-Dung, Sandra J. Shultz, Randy J. Schmitz, Richard M. Luecht, and David H. Perrin. "A Preliminary Multifactorial Approach Describing the Relationships Among Lower Extremity Alignment, Hip Muscle Activation, and Lower Extremity Joint Excursion." Journal of Athletic Training 46, no. 3 (2011): 246–56. http://dx.doi.org/10.4085/1062-6050-46.3.246.

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Context: Multiple factors have been suggested to increase the risk of faulty dynamic alignments that predict noncontact anterior cruciate ligament injury. Few researchers have examined this relationship using an integrated, multifactorial approach. Objective: To describe the relationship among static lower extremity alignment (LEA), hip muscle activation, and hip and knee motion during a single-leg squat. Design: Descriptive laboratory study. Setting: Research laboratory. Patients or Other Participants: Thirty men (age = 23.9 ± 3.6 years, height = 178.5 ± 9.9 cm, mass = 82.0 ± 14.1 kg) and 30

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Delmore, Robert J., Kevin G. Laudner, and Michael R. Torry. "Adductor Longus Activation During Common Hip Exercises." Journal of Sport Rehabilitation 23, no. 2 (2014): 79–87. http://dx.doi.org/10.1123/jsr.2012-0046.

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Context:Hip-adductor strains are among the most common lower-extremity injuries sustained in athletics. Treatment of these injuries involves a variety of exercises used to target the hip adductors.Objective:To identify the varying activation levels of the adductor longus during common hip-adductor exercises.Design:Descriptive study.Setting:Laboratory.Participants:24 physically active, college-age students.Intervention:None.Main Measurement Outcomes:Peak and average electromyographic (EMG) activity of the adductor longus muscle during the following 6 hip-adductor rehabilitation exercises: side-

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Chen, Wei-Han, Wen-Wen Yang, Ya-Chen Liu, Wen-Hsuan Pan, and Chiang Liu. "Effects of hula hooping and mini hooping on core muscle activation and hip movement." Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology 233, no. 1 (2018): 110–15. http://dx.doi.org/10.1177/1754337118807821.

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Hula hoops are a popular piece of fitness equipment used to attempt to slim the waistline and improve core muscle endurance. Although there are obvious visible movements at the waist and hip, no study has quantified the intensity of muscle activity during hula hooping. Therefore, this study analyzed muscle activation in the torso and hip during hula hooping. Because injury to the waist often occurs after prolonged, repeated impact between the waist and a hula hoop, this study developed a novel waist fitness hoop that eliminates impact, called the “Mini Hoop,” and determined the effects of mini

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Izadi Farhadi, Mohammad H., Foad Seidi, Hooman Minoonejad, and Abbey C. Thomas. "Differences in Gluteal and Quadriceps Muscle Activation Among Adults With and Without Lumbar Hyperlordosis." Journal of Sport Rehabilitation 29, no. 8 (2020): 1100–1105. http://dx.doi.org/10.1123/jsr.2019-0112.

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Context: Many factors have been reported contributing to altering the neuromuscular function of hip and knee muscles. The lumbar hyperlordosis, as a poor posture in some athletes, is thought to be associated with the alteration of the hip and knee muscles activity. Objective: To examine the activation of selected hip and knee muscles in athletes with and without lumbar hyperlordosis during functional activities. Design: Case-control study. Setting: University laboratory. Participants: Twenty-six college male athletes (n = 13 with and n = 13 without lumbar hyperlordosis). Interventions: Surface

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Hawkins, David, and Mark Smeulders. "An Investigation of the Relationship between Hip Extension Torque, Hip Extension Velocity, and Muscle Activation." Journal of Applied Biomechanics 15, no. 3 (1999): 253–69. http://dx.doi.org/10.1123/jab.15.3.253.

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The purpose of this study was to determine if the characteristic Hill model, used to describe me force–velocity relationship for isolated tetanically stimulated muscle, could be modified and used to describe me torque–velocity behavior of me hip for maximally and submaximally stimulated hip extensor muscles. Fourteen subjects performed hip extension movements at effort levels of 100%, 70%, and 40% of a maximum isometric effort. A solenoid provided isometric resistance to hip extension. Once the desired effort level was achieved, as indicated by me isometric force, the solenoid released and me

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Martelli, Saulo. "Femoral Neck Strain during Maximal Contraction of Isolated Hip-Spanning Muscle Groups." Computational and Mathematical Methods in Medicine 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/2873789.

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The aim of the study was to investigate femoral neck strain during maximal isometric contraction of the hip-spanning muscles. The musculoskeletal and the femur finite-element models from an elderly white woman were taken from earlier studies. The hip-spanning muscles were grouped by function in six hip-spanning muscle groups. The peak hip and knee moments in the model were matched to corresponding published measurements of the hip and knee moments during maximal isometric exercises about the hip and the knee in elderly participants. The femoral neck strain was calculated using full activation

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McBeth, Joseph M., Jennifer E. Earl-Boehm, Stephen C. Cobb, and Wendy E. Huddleston. "Hip Muscle Activity During 3 Side-Lying Hip-Strengthening Exercises in Distance Runners." Journal of Athletic Training 47, no. 1 (2012): 15–23. http://dx.doi.org/10.4085/1062-6050-47.1.15.

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Context: Lower extremity overuse injuries are associated with gluteus medius (GMed) weakness. Understanding the activation of muscles about the hip during strengthening exercises is important for rehabilitation. Objective: To compare the electromyographic activity produced by the gluteus medius (GMed), tensor fascia latae (TFL), anterior hip flexors (AHF), and gluteus maximus (GMax) during 3 hip-strengthening exercises: hip abduction (ABD), hip abduction with external rotation (ABD-ER), and clamshell (CLAM) exercises. Design: Controlled laboratory study. Setting: Laboratory. Patients or Other

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Hollman, John H., Barbara E. Ginos, Jakub Kozuchowski, Amanda S. Vaughn, David A. Krause, and James W. Youdas. "Relationships between Knee Valgus, Hip-Muscle Strength, and Hip-Muscle Recruitment during a Single-Limb Step-Down." Journal of Sport Rehabilitation 18, no. 1 (2009): 104–17. http://dx.doi.org/10.1123/jsr.18.1.104.

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Context:Reduced strength and activation of hip muscles might correlate with increased weight-bearing knee valgus.Objective:To describe relationships among frontal-plane hip and knee angles, hip-muscle strength, and electromyographic (EMG) recruitment in women during a step-down.Design:Exploratory study.Setting:Laboratory.Participants:20 healthy women 20 to 30 years of age.Interventions:Frontal-plane hip and knee angles were measured. Gluteus maximus and medius recruitment were examined with surface EMG. Hip-abduction and -external-rotation strength were quantified with handheld dynamometry.Mai

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Zajac, F. E. "Thigh muscle activity during maximum-height jumps by cats." Journal of Neurophysiology 53, no. 4 (1985): 979–94. http://dx.doi.org/10.1152/jn.1985.53.4.979.

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Cats were trained to jump from a force plate and touch a cotton ball suspended as high as 1.6 m. Force-plate reaction forces and double-joint hamstring muscle activity observed early in propulsion varied from one maximal jump to another. This variability is consistent with theory (31, 32, 42); that is, different coordination strategies can be implemented prior to the heels losing contact with the force plate (heel-off). Single-joint hip extensor and double-joint posterior thigh (hip extensor-knee flexor) muscles were coactivated prior to heel-off. This coactivation is probably partially respon

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Zeller, Brian L., Jean L. McCrory, W. Ben Kibler, and Timothy L. Uhl. "Differences in Kinematics and Electromyographic Activity between Men and Women during the Single-Legged Squat." American Journal of Sports Medicine 31, no. 3 (2003): 449–56. http://dx.doi.org/10.1177/03635465030310032101.

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Background Numerous factors have been identified as potentially increasing the risk of anterior cruciate ligament injury in the female athlete. However, differences between the sexes in lower extremity coordination, particularly hip control, are only minimally understood. Hypothesis There is no difference in kinematic or electromyographic data during the single-legged squat between men and women. Study Design Descriptive comparison study. Methods We kinematically and electromyographically analyzed the single-legged squat in 18 intercollegiate athletes (9 male, 9 female). Subjects performed fiv

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Bojsen-Møller, Jens, Thomas Losnegard, Jukka Kemppainen, Tapio Viljanen, Kari K. Kalliokoski, and Jostein Hallén. "Muscle use during double poling evaluated by positron emission tomography." Journal of Applied Physiology 109, no. 6 (2010): 1895–903. http://dx.doi.org/10.1152/japplphysiol.00671.2010.

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Due to the complexity of movement in cross-country skiing (XCS), the muscle activation patterns are not well elucidated. Previous studies have applied surface electromyography (SEMG); however, recent gains in three-dimensional (3D) imaging techniques such as positron emission tomography (PET) have rendered an alternative approach to investigate muscle activation. The purpose of the present study was to examine muscle use during double poling (DP) at two work intensities by use of PET. Eight male subjects performed two 20-min DP bouts on separate days. Work intensity was ∼53 and 74% of peak oxy

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Johanson, Marie A., Bruce H. Greenfield, Brenda L. Greene, and Thomas A. Abelew. "AN IMPAIRMENT-BASED INTERVENTION FOR A PATIENT WITH NON-SPECIFIC BILATERAL HIP PAIN: CLINICAL AND BIOMECHANICAL OUTCOMES." Journal of Musculoskeletal Research 12, no. 02 (2009): 113–25. http://dx.doi.org/10.1142/s0218957709002249.

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Study design: Case study. Background: To date, there is little research that has examined the association of impairments at the hip with cumulative trauma syndromes of the hip. The purposes of this case report are to: (1) describe clinical outcomes for a patient with non-specific bilateral musculoskeletal hip pain associated with recreational walking, (2) explore the relationship between this patient's impairments and her cumulative trauma syndrome at the hip, and (3) integrate biomechanical analysis with this patient's clinical diagnosis. Case description: The patient was a 28-year-old female

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Torres-Oviedo, Gelsy, and Lena H. Ting. "Muscle Synergies Characterizing Human Postural Responses." Journal of Neurophysiology 98, no. 4 (2007): 2144–56. http://dx.doi.org/10.1152/jn.01360.2006.

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Postural control is a natural behavior that requires the spatial and temporal coordination of multiple muscles. Complex muscle activation patterns characterizing postural responses suggest the need for independent muscle control. However, our previous work shows that postural responses in cats can be robustly reproduced by the activation of a few muscle synergies. We now investigate whether a similar neural strategy is used for human postural control. We hypothesized that a few muscle synergies could account for the intertrial variability in automatic postural responses from different perturba

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VOGT, L., W. BANZER, K. PFEIFER, and R. GALM. "Muscle Activation Pattern of Hip Arthroplasty Patients in Walking." Research in Sports Medicine 12, no. 3 (2004): 191–99. http://dx.doi.org/10.1080/15438620490497503.

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Savelberg, Hans H. C. M., Ingrid G. L. Van de Port, and Paul J. B. Willems. "Body Configuration in Cycling Affects Muscle Recruitment and Movement Pattern." Journal of Applied Biomechanics 19, no. 4 (2003): 310–24. http://dx.doi.org/10.1123/jab.19.4.310.

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By manipulating trunk angle in ergometer cycling, we studied the effect of body configuration on muscle recruitment and joint kinematics. Changing trunk angle affects the length of muscles that span the hip joint. It is hypothesized that this affects the recruitment of the muscles directly involved, and as a consequence of affected joint torque distributions, also influences the recruitment of more distal muscles and the kinematics of distal joints. It was found that changing the trunk from an upright position to approximately 20 deg forward or backward affected muscle activation patterns and

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Zuk, Emma F., Michelle C. Boling, Kevin R. Ford, Jeffrey B. Taylor, and Anh-Dung Nguyen. "Relationship Between Passive Hip Range of Motion And Hip Muscle Activation During Landing." Medicine & Science in Sports & Exercise 49, no. 5S (2017): 190. http://dx.doi.org/10.1249/01.mss.0000517357.67732.4d.

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Robertson, G. A., L. I. Mortin, J. Keifer, and P. S. Stein. "Three forms of the scratch reflex in the spinal turtle: central generation of motor patterns." Journal of Neurophysiology 53, no. 6 (1985): 1517–34. http://dx.doi.org/10.1152/jn.1985.53.6.1517.

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A turtle with a complete transection of the spinal cord, termed a spinal turtle, exhibits three types or “forms” of the scratch reflex: the rostral scratch, pocket scratch, and caudal scratch (21). Each scratch form is elicited by tactile stimulation of a site on the body surface innervated by afferents entering the spinal cord caudal to the transection. We recorded electromyographic (EMG) potentials from the hindlimb during each of the three forms of the scratch in the spinal turtle (see Fig. 1). Common to all scratch forms is the rhythmic alternation of the activity of the hip protractor mus

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Bolton, D. A. E., and J. E. Misiaszek. "Effects of ankle extensor muscle afferent inputs on hip abductor and adductor activity in the decerebrate walking cat." Journal of Neurophysiology 108, no. 11 (2012): 3034–42. http://dx.doi.org/10.1152/jn.00013.2012.

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Electrical stimulation of the lateral gastrocnemius-soleus (LGS) nerve at group I afferent strength leads to adaptations in the amplitude and timing of extensor muscle activity during walking in the decerebrate cat. Such afferent feedback in the stance leg might result from a delay in stance onset of the opposite leg. Concomitant adaptations in hip abductor and adductor activity would then be expected to maintain lateral stability and balance until the opposite leg is able to support the body. As many hip abductors and adductors are also hip extensors, we hypothesized that stimulation of the L

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Martín-Fuentes, Isabel, José M. Oliva-Lozano, and José M. Muyor. "Muscle Activation and Kinematic Analysis during the Inclined Leg Press Exercise in Young Females." International Journal of Environmental Research and Public Health 17, no. 22 (2020): 8698. http://dx.doi.org/10.3390/ijerph17228698.

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Knee joint muscle activation imbalances, especially weakness in the vastus medialis oblique, are related to patellofemoral pain within the female population. The available literature presents the leg press as an exercise which potentially targets vastus medialis oblique activation, thus reducing imbalances in the quadriceps muscles. The main aim of the present study was to compare thigh muscle activation and kinematic parameters under different conditions during the inclined leg press exercise in a young female population. A cross-sectional study was conducted on 10 young, trained females. Mus

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Lam, Tania, and Keir G. Pearson. "Proprioceptive Modulation of Hip Flexor Activity During the Swing Phase of Locomotion in Decerebrate Cats." Journal of Neurophysiology 86, no. 3 (2001): 1321–32. http://dx.doi.org/10.1152/jn.2001.86.3.1321.

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This study examined the influence of proprioceptive input from hip flexor muscles on the activity in hip flexors during the swing phase of walking in the decerebrate cat. One hindlimb was partially denervated to remove cutaneous input and afferent input from most other hindlimb muscles. Perturbations to hip movement were applied either by 1) manual resistance or assistance to swing or by 2) resistance to hip flexion using a device that blocked hip flexion but allowed leg extension. Electromyographic recordings were made from the iliopsoas (IP), sartorius, and medial gastrocnemius muscles. When

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Linde, Lukas D., Jessica Archibald, Eve C. Lampert, and John Z. Srbely. "The Effect of Abdominal Muscle Activation Techniques on Trunk and Lower Limb Mechanics During the Single-Leg Squat Task in Females." Journal of Sport Rehabilitation 27, no. 5 (2018): 438–44. http://dx.doi.org/10.1123/jsr.2016-0038.

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Context: Females suffer 4 to 6 times more noncontact anterior cruciate ligament (ACL) injuries than males due to neuromuscular control deficits of the hip musculature leading to increases in hip adduction angle, knee abduction angle, and knee abduction moment during dynamic tasks such as single-leg squats. Lateral trunk displacement has been further related to ACL injury risk in females, leading to the incorporation of core strength/stability exercises in ACL preventative training programs. However, the direct mechanism relating lateral trunk displacement and lower limb ACL risk factors is not

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Rutherford, Derek J., Janice Moreside, and Ivan Wong. "Differences in Hip Joint Biomechanics and Muscle Activation in Individuals With Femoroacetabular Impingement Compared With Healthy, Asymptomatic Individuals: Is Level-Ground Gait Analysis Enough?" Orthopaedic Journal of Sports Medicine 6, no. 5 (2018): 232596711876982. http://dx.doi.org/10.1177/2325967118769829.

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Background: Femoroacetabular impingement (FAI) is a recognized cause of hip and groin pain and a significant factor in hip joint function during sport. Objective tests for understanding hip function are lacking in this population. Purpose: To determine whether biomechanical and electromyographic features of hip function during level-ground walking differ between a group diagnosed with FAI and those with no symptoms of FAI. Study Design: Controlled laboratory study. Methods: A total of 20 asymptomatic individuals and 20 individuals with FAI walked on a dual-belt instrumented treadmill at self-s

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Lanza, Marcel, Vicki Gray, Alice Ryan, Will Perez, and Odessa Addison. "Role of Intramuscular Fat and Lean Muscle in Surface Electromyography Amplitude of the Gluteus Medius in Older Adults." Innovation in Aging 4, Supplement_1 (2020): 127. http://dx.doi.org/10.1093/geroni/igaa057.417.

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Abstract Surface electromyography (sEMG) is frequently used to assess muscle activation in older individuals. Subcutaneous fat is one well-known factor that influences sEMG amplitude. The amount of intramuscular fat (IMAT) may negatively impact the muscles ability to produce force with aging, while high density lean tissue (HDL; fat free muscle) has an opposite effect. However, influence of IMAT or HDL on sEMG amplitude remains unclear. Thus, the aim was to investigate the influence of IMAT and HDL on sEMG amplitude of the gluteus medius (GM) muscle during a maximal voluntary isometric contrac

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Dingenen, Bart, Louis Peeraer, Kevin Deschamps, Steffen Fieuws, Luc Janssens, and Filip Staes. "Muscle-Activation Onset Times With Shoes and Foot Orthoses in Participants With Chronic Ankle Instability." Journal of Athletic Training 50, no. 7 (2015): 688–96. http://dx.doi.org/10.4085/1062-6050-50.2.02.

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Context Participants with chronic ankle instability (CAI) use an altered neuromuscular strategy to shift weight from double-legged to single-legged stance. Shoes and foot orthoses may influence these muscle-activation patterns. Objective To evaluate the influence of shoes and foot orthoses on onset times of lower extremity muscle activity in participants with CAI during the transition from double-legged to single-legged stance. Design Cross-sectional study. Setting Musculoskeletal laboratory. Patients or Other Participants A total of 15 people (9 men, 6 women; age = 21.8 ± 3.0 years, height =

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Wachi, M., T. Kurihara, M. Fujimoto, N. Kanazawa, and T. Isaka. "Asymmetric muscle activation in the lumbar multifidus muscle during unilateral prone hip extension." Physiotherapy 101 (May 2015): e1594. http://dx.doi.org/10.1016/j.physio.2015.03.1602.

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Hakansson, Nils A., and M. L. Hull. "Functional Roles of the Leg Muscles When Pedaling in the Recumbent Versus the Upright Position." Journal of Biomechanical Engineering 127, no. 2 (2004): 301–10. http://dx.doi.org/10.1115/1.1865192.

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An understanding of the coordination of the leg muscles in recumbent pedaling would be useful to the design of rehabilitative pedaling exercises. The objectives of this work were to (i) determine whether patterns of muscle activity while pedaling in the recumbent and upright positions are similar when the different orientation in the gravity field is considered, (ii) compare the functional roles of the leg muscles while pedaling in the recumbent position to the upright position to the upright position and (iii) determine whether leg muscle onset and offset timing for recumbent and upright peda

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Dooley, Katherine, Suzanne J. Snodgrass, Peter Stanwell, et al. "Spatial muscle activation patterns during different leg exercise protocols in physically active adults using muscle functional MRI: a systematic review." Journal of Applied Physiology 129, no. 4 (2020): 934–46. http://dx.doi.org/10.1152/japplphysiol.00290.2020.

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An emerging method to measure muscle activation patterns is muscle functional magnetic resonance imaging (mfMRI), where preexercise and postexercise muscle metabolism differences indicate spatial muscle activation patterns. We evaluated studies employing mfMRI to determine activation patterns of lumbar or lower limb muscles following exercise in physically active adults. Electronic systematic searches were conducted until March 2020. All studies employing ≥1.5 Tesla MRI scanners to compare spatial muscle activation patterns at the level of or inferior to the first lumbar vertebra in healthy, a

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Horak, F. B., and L. M. Nashner. "Central programming of postural movements: adaptation to altered support-surface configurations." Journal of Neurophysiology 55, no. 6 (1986): 1369–81. http://dx.doi.org/10.1152/jn.1986.55.6.1369.

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We studied the extent to which automatic postural actions in standing human subjects are organized by a limited repertoire of central motor programs. Subjects stood on support surfaces of various lengths, which forced them to adopt different postural movement strategies to compensate for the same external perturbations. We assessed whether a continuum or a limited set of muscle activation patterns was used to produce different movement patterns and the extent to which movement patterns were influenced by prior experience. Exposing subjects standing on a normal support surface to brief forward

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Schuermans, Joke, Damien Van Tiggelen, and Erik Witvrouw. "Prone Hip Extension Muscle Recruitment is Associated with Hamstring Injury Risk in Amateur Soccer." International Journal of Sports Medicine 38, no. 09 (2017): 696–706. http://dx.doi.org/10.1055/s-0043-103016.

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Abstract‘Core stability’ is considered essential in rehabilitation and prevention. Particularly with respect to hamstring injury prevention, assessment and training of lumbo-pelvic control is thought to be key. However, supporting scientific evidence is lacking. To explore the importance of proximal neuromuscular function with regard to hamstring injury susceptibility, this study investigated the association between the Prone Hip Extension (PHE) muscle activation pattern and hamstring injury incidence in amateur soccer players. 60 healthy male soccer players underwent a comprehensive clinical

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Andersson, Eva A., Johnny Nilsson, Zhijia Ma, and Alf Thorstensson. "Abdominal and hip flexor muscle activation during various training exercises." European Journal of Applied Physiology 75, no. 2 (1997): 115–23. http://dx.doi.org/10.1007/s004210050135.

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Diamond, Laura E., Wolbert van den Hoorn, Kim L. Bennell, et al. "Deep hip muscle activation during squatting in femoroacetabular impingement syndrome." Clinical Biomechanics 69 (October 2019): 141–47. http://dx.doi.org/10.1016/j.clinbiomech.2019.07.017.

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Dwyer, Maureen K., Samantha N. Boudreau, Carl G. Mattacola, Timothy L. Uhl, and Christian Lattermann. "Comparison of Lower Extremity Kinematics and Hip Muscle Activation During Rehabilitation Tasks Between Sexes." Journal of Athletic Training 45, no. 2 (2010): 181–90. http://dx.doi.org/10.4085/1062-6050-45.2.181.

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Abstract Context: Closed kinetic chain exercises are an integral part of rehabilitation programs after lower extremity injury. Sex differences in lower extremity kinematics have been reported during landing and cutting; however, less is known about sex differences in movement patterns and activation of the hip musculature during common lower extremity rehabilitation exercises. Objective: To determine whether lower extremity kinematics and muscle activation levels differ between sexes during closed kinetic chain rehabilitation exercises. Design: Cross-sectional with 1 between-subjects factor (s

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Tillaar, Roland van den, and Eric Helms. "Comparison of Muscle Activation and Kinematics in 6-RM Squatting With Low and High Barbell Placement." Journal of Human Kinetics 74, no. 1 (2020): 131–42. http://dx.doi.org/10.2478/hukin-2020-0021.

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Abstract The aim of this study was to compare 6-RM muscle activation and kinematics in back squats with low and high barbell placements. Twelve resistance-trained males (23.5 ± 2.6 years, 86.8 ± 21.3 kg, 1.81 ± 0.08 m) with a minimum of 2 years of squatting experience performed a 6-RM using high and low barbell placements while muscle activation of eight muscles and joint kinematics were measured. During high barbell placement squats, lifting time was longer, with lower average velocity than low barbell placement. This was accompanied by a lesser knee flexion angle at the lowest point of the s

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Son, S. Jun, Hyunsoo Kim, Matthew K. Seeley, and J. Ty Hopkins. "Altered Walking Neuromechanics in Patients With Chronic Ankle Instability." Journal of Athletic Training 54, no. 6 (2019): 684–97. http://dx.doi.org/10.4085/1062-6050-478-17.

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Context The literature on gait kinematics and muscle activation in chronic ankle instability (CAI) is limited. A comprehensive evaluation of all relevant gait measures is needed to examine alterations in gait neuromechanics that may contribute to recurrent sprain. Objective To compare walking neuromechanics, including kinematics, muscle activity, and kinetics (ie, ground reaction force [GRF], moment, and power), between participants with and those without CAI by applying a novel statistical analysis to data from a large sample. Design Controlled laboratory study. Setting Biomechanics laborator

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Mercer, Vicki Stemmons, Michael T. Gross, Subhashini Sharma, and Erin Weeks. "Comparison of Gluteus Medius Muscle Electromyographic Activity During Forward and Lateral Step-up Exercises in Older Adults." Physical Therapy 89, no. 11 (2009): 1205–14. http://dx.doi.org/10.2522/ptj.20080229.

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Background Step-up exercises often are suggested for strengthening the hip abductor muscles and improving balance in older adults. Little is known, however, about whether the forward or lateral version of these exercises is best for activating the hip abductor muscles. Objective The purpose of this study was to examine the electromyographic (EMG) amplitude of the gluteus medius (GM) muscles bilaterally during forward and lateral step-up exercises. Design The study design involved single-occasion repeated measures. Methods Twenty-seven community-dwelling adults (7 men and 20 women) with a mean

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