scholarly journals Effect of iliopsoas muscle tightness on electromyographic activity of hip extensor synergists during gait

2021 ◽  
Vol 43 (1) ◽  
pp. 76-83
Author(s):  
Shirin Aali ◽  
Shahabeddin Bagheri
Keyword(s):  
Stance Phase ◽  
Muscle Length ◽  
Gluteus Maximus ◽  
Biceps Femoris ◽  
Control Group ◽  
Electromyographic Activity ◽  
Flexor Muscle ◽  
Adductor Magnus ◽  
Muscle Tightness ◽  
Hip Flexor

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 age, height, weight, body mass index, dominant leg and sport experience participated voluntarily as control group. Surface electromyographic activity of the gluteus maximus, adductor magnus and biceps femoris, were measured between groups during stance phase of gait. Results: Individuals with restricted hip flexor muscle length demonstrated more gluteus maximus activation during terminal stance (p=.001), more biceps femoris activation during mid stance (p=.002) and late stance (p=.001) and more adductor magnus activation during mid stance (p=.04) and late stance (p=.001). Conclusion: Adolescent soccer athletes with hip flexor muscle tightness exhibit more biceps femoris and adductor magnus and gluteus maximus activation during stance phase of gait. Thus, individuals with hip flexor muscle tightness appear to utilize different neuromuscular strategies to control lower extremity motion.

scholarly journals Wearable Sensors Detect Differences between the Sexes in Lower Limb Electromyographic Activity and Pelvis 3D Kinematics during Running

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6478
Author(s):  
Iván Nacher Moltó ◽  
Juan Pardo Albiach ◽  
Juan José Amer-Cuenca ◽  
Eva Segura-Ortí ◽  
Willig Gabriel ◽  
...  
Keyword(s):  
Lower Limb ◽  
Muscle Activation ◽  
Stance Phase ◽  
Inertial Sensor ◽  
Scientific Evidence ◽  
Wearable Sensors ◽  
Three Dimensional ◽  
Gluteus Maximus ◽  
Electromyographic Activity ◽  
Men And Women

Each year, 50% of runners suffer from injuries. Consequently, more studies are being published about running biomechanics; these studies identify factors that can help prevent injuries. Scientific evidence suggests that recreational runners should use personalized biomechanical training plans, not only to improve their performance, but also to prevent injuries caused by the inability of amateur athletes to tolerate increased loads, and/or because of poor form. This study provides an overview of the different normative patterns of lower limb muscle activation and articular ranges of the pelvis during running, at self-selected speeds, in men and women. Methods: 38 healthy runners aged 18 to 49 years were included in this work. We examined eight muscles by applying two wearable superficial electromyography sensors and an inertial sensor for three-dimensional (3D) pelvis kinematics. Results: the largest differences were obtained for gluteus maximus activation in the first double float phase (p = 0.013) and second stance phase (p = 0.003), as well as in the gluteus medius in the second stance phase (p = 0.028). In both cases, the activation distribution was more homogeneous in men and presented significantly lower values than those obtained for women. In addition, there was a significantly higher percentage of total vastus medialis activation in women throughout the running cycle with the median (25th–75th percentile) for women being 12.50% (9.25–14) and 10% (9–12) for men. Women also had a greater range of pelvis rotation during running at self-selected speeds (p = 0.011). Conclusions: understanding the differences between men and women, in terms of muscle activation and pelvic kinematic values, could be especially useful to allow health professionals detect athletes who may be at risk of injury.

EFFECT OF AN ANNUAL TAEKWONDO TRAINING PROGRAM ON THE ELECTROMYOGRAPHIC CHARACTERISTICS OF FRONTAL KICK YOP CHAGI

2021 ◽  
pp. 62-64
Author(s):  
Daniilidis Panagiotis ◽  
Gkisis Ioannis ◽  
Vrabas Ioannis ◽  
Kellis Eleftherios ◽  
Boutios Stefanos ◽  
...  
Keyword(s):  
Training Program ◽  
Rectus Femoris ◽  
Biceps Femoris ◽  
Control Group ◽  
Electromyographic Activity ◽  
Program Technique ◽  
Long Head ◽  
Analysis System ◽  
Training Team ◽  
Olympic Sport

Taekwondo is one of the most difcult and complex but one of the most complete and exciting Olympic sport. Fitness and conditioning are what you need to gain points with kicks that determine the level of competitive ability. The purpose of this study is to examine the results of an annual training program, in selected electromyographic variables of Yop chagi to maximize the performance of Taekwondo athletes. The sample consisted of 20 Taekwondo athletes, advanced holders of Black Belt, aged M = 19.11 years, sd = 3.45, height M = 1.73 cm, sd = 6.80 and weight M = 67.23 Kg, sd = 12.73 which were divided into 2 equal groups. The rst team (TT), Training Team followed a specic tness program, technique. The second group followed its own program, Control Group (CG). Surface electrodes (motion control co.) with preamplier, an electronic shield (approved by the WTF) were used for the measurements. Electromyographic characteristics of the test were measured with the APAS (Ariel Performance Analysis System), dynamic and evaluated with Bioanalysis program. Three measurements were performed in this study, an initial, an intermediate a nal measurement at the end of the program. The subject executes the technique of Yop Chagi kick, on the opponent's electronic chest, with simultaneously electromyographic activity of the Rectus Femoris (RF), the long head of Biceps Femoris (BF) and the lateral head of Gastrocnemius (GAS). The neuromuscular activity recorded during the execution of the technique in the experimental group for each muscle group is different from that of the control group. Athletes who followed the annual program improved their muscular pre-activation and activation, responded successfully enough to the execution of the kick, since a successful kick depends on both technical and physical condition

Lumbar Curvature in Standing and Sitting in Two Types of Chairs: Relationship of Hamstring and Hip Flexor Muscle Length

1990 ◽  
Vol 70 (10) ◽  
pp. 611-618 ◽  
Author(s):  
Carol S Link ◽  
Garvice G Nicholson ◽  
Shirley A Shaddeau ◽  
Robert Birch ◽  
Marilyn R Gossman
Keyword(s):  
Muscle Length ◽  
Flexor Muscle ◽  
Relationship Of ◽  
Hip Flexor

Lunges activate the gluteus maximus muscles more than back squats when both exercises are standardized

2021 ◽  
pp. 1-7
Author(s):  
Rodrigo Ramalho Aniceto ◽  
André Luiz Torres Pirauá ◽  
Leonardo da Silva Leandro ◽  
Hélen Cristina Ferreira da Silva ◽  
Diego Mesquita Silva ◽  
...  
Keyword(s):  
Resistance Training ◽  
Vastus Lateralis ◽  
Knee Extensor ◽  
Gluteus Maximus ◽  
Biceps Femoris ◽  
Lower Limbs ◽  
Emg Activity ◽  
Flexor Muscle ◽  
Back Squat ◽  
Trunk Inclination

BACKGROUND: Squats are considered one of the main exercises for the lower limbs and are used in resistance training under different contexts, including rehabilitation and sports performance. OBJECTIVE: To compare the EMG activity of different muscles in back squat and lunge exercises in trained women. METHODS: Ten healthy women experienced in resistance training performed back squat and lunge exercises on a Smith machine (total work: 70% of 1RM, 1 set, 10 repetitions and 2-s/2-s of execution speed) with an interval of 20-min between exercises. Both exercises were standardized in relation to the trunk inclination and were performed with an erect trunk parallel to the cursor of the guided bar. RESULTS: The EMG activity of the vastus medialis (VM), vastus lateralis (VL), biceps femoris (BF), and gluteus maximus (GM) were analyzed. There were no significant differences in the EMG activity of the VM, VL, and BF muscles between the back squat and lunge exercises (P> 0.05); however, GM activation was greater during the lunge exercise (effect size = 1.15; P= 0.001). CONCLUSIONS: Lunges were more effective in recruiting the GM when compared to back squats. However, both exercises can be recommended when the goal is knee extensor and flexor muscle activity.

scholarly journals Influence of Nordic Walking Training on Muscle Strength and the Electromyographic Activity of the Lower Body in Women With Low Bone Mass

2016 ◽  
Vol 23 (2) ◽  
pp. 88-93
Author(s):  
Zbigniew Ossowski ◽  
Ewelina Liedtke ◽  
Katarzyna Siemieniuk ◽  
Sandra Szydłowska ◽  
Piotr Sakowski ◽  
...  
Keyword(s):  
Muscle Strength ◽  
Bone Mass ◽  
Gluteus Maximus ◽  
Emg Activity ◽  
Control Group ◽  
Electromyographic Activity ◽  
Lower Body ◽  
Low Bone Mass ◽  
Nordic Walking ◽  
Experimental Group

Abstract Introduction. Osteoporosis and osteopenia are related to changes in the quantity and quality of skeletal muscle and contribute to a decreased level of muscle strength. The purpose of this study was to evaluate the impact of Nordic walking training on muscle strength and the electromyographic (EMG) activity of the lower body in women with low bone mass. Material and methods. The participants of the study were 27 women with low bone mass. The sample was randomly divided into two groups: a control group and an experimental group. Women from the experimental group participated in 12 weeks of regular Nordic walking training. Functional strength was assessed with a 30-second chair stand test. The EMG activities of the gluteus maximus (GMax), rectus femoris (RF), biceps femoris (BF), soleus (SOL), and lumbar (LB) muscles were measured using a surface electromyogram. Results. Nordic walking training induced a significant increase in the functional strength (p = 0.006) of the lower body and activity of GMax (p = 0.013) and a decrease in body mass (p = 0.006) in women with reduced bone mass. There was no statistically significant increase in the EMG activities of the RF, BF, SOL, or LB muscles. The study did not indicate any significant changes in functional muscle strength, the EMG activity of the lower body, or anthropometry in women from the control group. Conclusions. Nordic walking training induces positive changes in lower body strength and the electromyographic activity of the gluteus maximus as well as a decrease in body mass in women with low bone mass.

Effect of Traditional vs. Modified Bent-Knee Sit-Up on Abdominal and Hip Flexor Muscle Electromyographic Activity

2015 ◽  
Vol 29 (12) ◽  
pp. 3472-3479 ◽  
Author(s):  
William Sullivan ◽  
Fredrick A. Gardin ◽  
Christopher R. Bellon ◽  
Steven Leigh
Keyword(s):  
Electromyographic Activity ◽  
Flexor Muscle ◽  
Hip Flexor

Lower Extremity Muscle Functions during Full Squats

2008 ◽  
Vol 24 (4) ◽  
pp. 333-339 ◽  
Author(s):  
D.G.E. Robertson ◽  
Jean-Marie J. Wilson ◽  
Taunya A. St. Pierre
Keyword(s):  
Inverse Dynamics ◽  
Vastus Lateralis ◽  
Muscle Length ◽  
Gluteus Maximus ◽  
Rectus Femoris ◽  
Biceps Femoris ◽  
Knee Extensors ◽  
Plantar Flexors ◽  
Lower Extremity Muscle ◽  
Length Changes

The purpose of this research was to determine the functions of the gluteus maximus, biceps femoris, semitendinosus, rectus femoris, vastus lateralis, soleus, gastrocnemius, and tibialis anterior muscles about their associated joints during full (deep-knee) squats. Muscle function was determined from joint kinematics, inverse dynamics, electromyography, and muscle length changes. The subjects were six experienced, male weight lifters. Analyses revealed that the prime movers during ascent were the monoarticular gluteus maximus and vasti muscles (as exemplified by vastus lateralis) and to a lesser extent the soleus muscles. The biarticular muscles functioned mainly as stabilizers of the ankle, knee, and hip joints by working eccentrically to control descent or transferring energy among the segments during ascent. During the ascent phase, the hip extensor moments of force produced the largest powers followed by the ankle plantar flexors and then the knee extensors. The hip and knee extensors provided the initial bursts of power during ascent with the ankle extensors and especially a second burst from the hip extensors adding power during the latter half of the ascent.

A Comparison of Gluteus Maximus, Biceps Femoris, and Vastus Lateralis Electromyographic Activity in the Back Squat and Barbell Hip Thrust Exercises

2015 ◽  
Vol 31 (6) ◽  
pp. 452-458 ◽  
Author(s):  
Bret Contreras ◽  
Andrew D. Vigotsky ◽  
Brad J. Schoenfeld ◽  
Chris Beardsley ◽  
John Cronin
Keyword(s):  
Vastus Lateralis ◽  
Gluteus Maximus ◽  
Biceps Femoris ◽  
Emg Activity ◽  
Electromyographic Activity ◽  
Lower Body ◽  
Back Squat ◽  
Training Studies ◽  
And Performance ◽  
Increased Strength

The back squat and barbell hip thrust are both popular exercises used to target the lower body musculature; however, these exercises have yet to be compared. Therefore, the purpose of this study was to compare the surface electromyographic (EMG) activity of the upper and lower gluteus maximus, biceps femoris, and vastus lateralis between the back squat and barbell hip thrust. Thirteen trained women (n = 13; age = 28.9 years; height = 164 cm; mass = 58.2 kg) performed estimated 10-repetition maximums (RM) in the back squat and barbell hip thrust. The barbell hip thrust elicited significantly greater mean (69.5% vs 29.4%) and peak (172% vs 84.9%) upper gluteus maximus, mean (86.8% vs 45.4%) and peak (216% vs 130%) lower gluteus maximus, and mean (40.8% vs 14.9%) and peak (86.9% vs 37.5%) biceps femoris EMG activity than the back squat. There were no significant differences in mean (99.5% vs 110%) or peak (216% vs 244%) vastus lateralis EMG activity. The barbell hip thrust activates the gluteus maximus and biceps femoris to a greater degree than the back squat when using estimated 10RM loads. Longitudinal training studies are needed to determine if this enhanced activation correlates with increased strength, hypertrophy, and performance.

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