The effects of pressure biofeedback on hip and trunk muscle activity and lumbopelvic alignment during one-leg standing

2020 ◽  
pp. 1-8
Author(s):  
Soo-Yong Kim ◽  
Il-Young Yu ◽  
Min-Hyeok Kang
Keyword(s):  
Muscle Activity ◽  
Gluteus Medius ◽  
Minimal Change ◽  
Trunk Muscles ◽  
Maximum Pressure ◽  
Lateral Deviation ◽  
Quadratus Lumborum ◽  
Lean Angle ◽  
Maximal Pressure ◽  
Pressure Biofeedback

BACKGROUND: During one-leg standing (OLS), optimum activity of the gluteus medius (Gmed), multifidus (MF), and quadratus lumborum (QL) muscles relies upon maintaining neutral lumbopelvic alignment. However, no studies have examined how using pressure biofeedback during OLS affects the activity of these muscles and the concomitant alignment of the pelvis and trunk. OBJECTIVES: The purpose of this study was to investigate the effect of pressure biofeedback on the activity of the Gmed, MF, and QL and the femoropelvic and trunk lean angles during OLS. METHODS: Twenty-four healthy males performed OLS with (PB+) and without (PB-) pressure biofeedback. For all OLS conditions, a pressure sensor was placed between the lateral surface of the humerus on the non-supporting side and the wall. Under the PB- condition, participants performed preferred OLS while the examiner measured the maximum pressure caused by trunk lean. Under the PB+ condition, participants were asked to perform at a threshold of 50% of the maximal pressure (PB+ 1 condition) and with minimal change in pressure (PB+ 2 condition). Muscle activities of MF, QL, and Gmed as well as the femoropelvic and trunk lean angles were measured under various OLS conditions. RESULTS: The activity of the Gmed, MF, and QL was greater under both PB+ conditions than under the PB- condition (p< 0.05). Also, both PB+ conditions resulted in a greater femoropelvic angle and reduced trunk lean angle. There were no significant differences in muscle activity, femoropelvic angle, or trunk lean angle between PB+ 1 and PB+ 2 (p> 0.05). CONCLUSIONS: These results suggest that pressure biofeedback is a useful modality for increasing the activity of the Gmed and trunk muscles, especially the MF muscle on the non-supporting leg side, and for preventing compensatory movements such as trunk deviation and pelvic lateral deviation during OLS.

scholarly journals Kinematic and EMG Comparison Between Variations of Unilateral Squats Under Different Stabilities

2020 ◽  
Vol 4 (02) ◽  
pp. E59-E66
Author(s):  
Roland van den Tillaar ◽  
Stian Larsen
Keyword(s):  
Muscle Activity ◽  
Rectus Femoris ◽  
Gluteus Medius ◽  
Biceps Femoris ◽  
Peak Force ◽  
Erector Spinae ◽  
Trunk Muscles ◽  
Training Experience ◽  
Free Weight ◽  
Weight Condition

AbstractThe purpose of the study was to compare kinematics and muscle activity between two variations of unilateral squats under different stability conditions. Twelve male volunteers (age: 23±5 years, mass: 80±17 kg, height: 1.81±0.11 m, strength-training experience: 4.3±1.9 years) performed four repetitions with the same external load (≈4RM). Two variations (with the non-stance leg forwards vs. backwards) were performed in a Smith-machine and free-weight condition. The variables were barbell velocity, lifting time and surface electromyography activity of the lower extremity and trunk muscles during the descending and ascending phase. The main findings were 1) peak force was higher when performing the unilateral squats in the Smith machine; 2) peak ascending barbell velocity increased from repetition 3–4 with free weight; and 3) muscle activity from the rectus femoris, vastus lateral, biceps femoris, gluteus medius, and erector spinae increased with repetitions, whereas gluteus, and medial vastus and shank muscles were affected by the conditions. It was concluded that more peak force could be produced because of increased stability. However, peak barbell velocity increased from repetition to repetition in free-weight unilateral squats, which was probably because the participants grew more comfortable. Furthermore, increased instability causes more gluteus and vastus medial activation and foot variations mainly affected the calf muscles.

scholarly journals The Effect of Isometric Hip External Rotation on Lower Extremity Muscles Activities During Pelvic Drop With Different Positions of the Hip Rotation in Subjects With and Without Genu Valgum: Controlled Laboratory Study

2022 ◽  
Author(s):  
Roghayeh Jalil piran ◽  
Farideh Babakhani ◽  
Ramin Balochi ◽  
Mohamadreza Hatefi
Keyword(s):  
Lower Extremity ◽  
Muscle Activity ◽  
External Rotation ◽  
Exercise Program ◽  
Gluteus Medius ◽  
Genu Valgum ◽  
Recreational Athletes ◽  
Quadratus Lumborum ◽  
Functional Defect ◽  
Hip Rotation

Abstract Background: Gluteus medius muscle (Gmed) dysfunction has been confirmed as a functional defect in subjects with Genu Valgum Deformity (GVD). In relation to these subjects, increase Gmed activity without synergist muscles dominance is considered as part of a specialized exercise program. Methods: A total of thirty female recreational athletes with (n=15) and without (n=15) GVD participated in this study. Surface electromyography measured Gmed, tensor fascia latae (TFL), and quadratus lumborum (QL) muscles activity when subjects performed pelvic drop (PD) in three different positions of hip rotations with and without applied isometric hip external rotation force. Results: There were differences in muscle activity between GVD and healthy subjects. The Gmed/TFL and Gmed/QL muscles activity ratio altered when placing the hip in different rotation positions and applying isometric load. Conclusions: The lower extremity muscles activity is affected by GVD, and changing the positions of the hip rotation in the PD task can be associated with altered muscle activity in both GVD and healthy Groups. However, applying isometric hip external rotation during PD can be suggested as an effective intervention to increase Gmed activity.

Electromyographic Analysis of Hip and Trunk Muscle Activity During Side Bridge Exercises in Subjects With Gluteus Medius Weakness

2020 ◽  
pp. 1-6
Author(s):  
Kyung-eun Lee ◽  
Seung-min Baik ◽  
Chung-hwi Yi ◽  
Oh-yun Kwon ◽  
Heon-seock Cynn
Keyword(s):  
Muscle Activity ◽  
Repeated Measures ◽  
Knee Flexion ◽  
Gluteus Maximus ◽  
Random Order ◽  
Gluteus Medius ◽  
Surface Emg ◽  
Trunk Muscles ◽  
Emg Activity ◽  
Abdominal Muscles

Context: Side bridge exercises strengthen the hip, trunk, and abdominal muscles and challenge the trunk muscles without the high lumbar compression associated with trunk extension or curls. Previous research using electromyography (EMG) reports that performance of the side bridge exercise highly activates the gluteus medius (Gmed). However, to the best of our knowledge, no previous research has investigated EMG amplitude in the hip and trunk muscles during side bridge exercise in subjects with Gmed weakness. Objective: The purpose of this study was to examine the EMG activity of the hip and trunk muscles during 3 variations of the side bridge exercise (side bridge, side bridge with knee flexion, and side bridge with knee flexion and hip abduction of the top leg) in subjects with Gmed weakness. Design: Repeated-measures experimental design. Setting: Research laboratory. Patients: Thirty subjects (15 females and 15 males) with Gmed weakness participated in this study. Intervention: Each subject performed 3 variations of the side bridge exercise in random order. Main Outcome Measures: Surface EMG was used to measure the muscle activities of the rectus abdominis, external oblique, longissimus thoracis, multifidus, Gmed, gluteus maximus, and tensor fasciae latae (TFL), and Gmed/TFL muscle activity ratio during 3 variations of the side bridge exercise. Results: There were significant differences in Gmed (F2,56 = 110.054, P < .001), gluteus maximus (F2,56 = 36.416, P < .001), and TFL (F2,56 = 108.342, P < .001) muscles among the 3 side bridge exercises. There were significant differences in the Gmed/TFL muscle ratio (F2,56 = 20.738, P < .001). Conclusion: Among 3 side bridge exercises, the side bridge with knee flexion may be effective for the individuals with Gmed weakness among 3 side bridge exercises to strengthen the gluteal muscles, considering the difficulty of the exercise and relative contribution of Gmed and TFL.

scholarly journals EMG-pressure Response in the Transverse Abdominis and Multifidus Muscles among Individuals With and Without Chronic Low Back Pain

2020 ◽  
Author(s):  
Chu huai Wang ◽  
Xin Li ◽  
Wai Leung Ambrose Lo ◽  
Song wei Lu ◽  
Howe Liu ◽  
...  
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Muscle Activity ◽  
Low Cost ◽  
Random Order ◽  
Trunk Muscles ◽  
Control Group ◽  
Low Back ◽  
Maximal Voluntary Isometric Contraction ◽  
Pressure Biofeedback

Abstract Background: Pressure biofeedback unit (PBU) is a non-invasive, low-cost, and widely used device for monitoring, evaluating and training transverse abdominals (TA) and multifidus (MF) muscles of patients with low back pain (LBP). There has been little research on quantifying muscle activity under different pressures. The primary aim of this preliminary study was to explore the response between deep local trunk muscles (TA and MF) and different target pressures of PBU in seated positions. Methods: Twenty-two patients with chronic LBP (cLBP) and 24 age matched healthy individuals were recruited. Electromyography (EMG) signals were recorded from the TA and MF muscles while individuals contract the TA and MF muscles in seated position to achieve PBU pressure value of 50, 60 and 70mmHg in random order. The t-test was used to compare between-group and within-subjects’ effects to examine the effect of different pressure values. Spearman’s correlation analysis was performed in the cLBP group to determine potential correlations. Results: The %MVIC of the TA and MF in the cLBP group were statistically higher than the control group at each pressure value (P＜0.05). The slope of the cLBP subjects was significantly steeper than the healthy control subjects (TA: P=0.01, MF: P＜0.001). During maximal voluntary isometric contraction (MVIC) of TA and MF, compared with pain-free group, cLBP patients showed a significant decrease (P≤0.001). MF MVIC was significantly and moderately negatively correlated with visual analog scale (VAS) (r = -0.48, P=0.024) and Oswestry Disability Index (ODI) (r = -0.59, P=0.004). Conclusions: The study demonstrates the feasibility of using PBU to assess muscle contraction that corresponds with changes of muscle activity as measured by EMG. The use of EMG to quantify the extent of how much the PBU activates muscles may provide important information to clinicians and researchers for patients with LBP.

Comparison among low intensity bridge exercises using suspension devices based on muscle activity and subjective difficulty

2021 ◽  
pp. 1-6
Author(s):  
Sang-Yeol Lee ◽  
Se-Yeon Park
Keyword(s):  
Inclination Angle ◽  
Muscle Activity ◽  
Erector Spinae ◽  
Trunk Muscles ◽  
Oblique Muscle ◽  
Abdominal Muscles ◽  
Internal Oblique Muscle ◽  
Low Intensity ◽  
Erector Spinae Muscle ◽  
Internal Oblique

BACKGROUND: Recent clinical studies have revealed the advantages of using suspension devices. Although the supine, lateral, and forward leaning bridge exercises are low-intensity exercises with suspension devices, there is a lack of studies directly comparing exercise progression by measuring muscular activity and subjective difficulty. OBJECTIVE: To identify how the variations in the bridge exercise affects trunk muscle activity, the present study investigated changes in neuromuscular activation during low-intensity bridge exercises. We furthermore explored whether the height of the suspension point affects muscle activation and subjective difficulty. METHODS: Nineteen asymptomatic male participants were included. Three bridge exercise positions, supine bridge (SB), lateral bridge (LB), forward leaning (FL), and two exercise angles (15 and 30 degrees) were administered, thereby comparing six bridge exercise conditions with suspension devices. Surface electromyography and subjective difficulty data were collected. RESULTS: The rectus abdominis activity was significantly higher with the LB and FL exercises compared with the SB exercise (p< 0.05). The erector spinae muscle activity was significantly higher with the SB and LB exercises, compared with the FL exercise (p< 0.05). The LB exercise significantly increased the internal oblique muscle activity, compared with other exercise variations (p< 0.05). The inclination angle of the exercise only affected the internal oblique muscle and subjective difficulty, which were significantly higher at 30 degrees compared with 15 degrees (p< 0.05). CONCLUSIONS: Relatively higher inclination angle was not effective in overall activation of the trunk muscles; however, different bridge-type exercises could selectively activate the trunk muscles. The LB and SB exercises could be good options for stimulating the internal oblique abdominis, and the erector spinae muscle, while the FL exercise could minimize the erector spinae activity and activate the abdominal muscles.

Effects of Anterior Cruciate Ligament (ACL) Injury on Muscle Activity of Head, Neck and Trunk Muscles: A Cross-Sectional Evaluation

CRANIO® ◽  
2007 ◽  
Vol 25 (3) ◽  
pp. 177-185 ◽  
Author(s):  
Simona Tecco ◽  
Vincenzo Salini ◽  
Stefano Teté ◽  
Felice Festa ◽  
Christian Colucci
Keyword(s):  
Anterior Cruciate Ligament ◽  
Muscle Activity ◽  
Cruciate Ligament ◽  
Acl Injury ◽  
Trunk Muscles ◽  
Cross Sectional ◽  
Anterior Cruciate ◽  
Head Neck

scholarly journals Relations between Posture and Trunk Muscle Functions in Girls with Idiopathic Scoliosis

2019 ◽  
Vol 2 (17) ◽  
Author(s):  
Lina Budrienė ◽  
Romualdas Sinkevičius ◽  
Tomas Aukštikalnis ◽  
Indrė Ščiukaitė
Keyword(s):  
Idiopathic Scoliosis ◽  
Comprehensive Evaluation ◽  
Trunk Muscle ◽  
Stability Test ◽  
Trunk Muscles ◽  
Lateral Deviation ◽  
Trunk Stability ◽  
Surface Rotation ◽  
Trunk Inclination ◽  
Muscle Functions

Background. Idiopathic scoliosis (IS) affects 1–3% of children aged 10–16 years (Weinstein et al., 2008). It is important to make comprehensive evaluation and treatment of IS because it provokes health problems and progresses (Negrini et al., 2006). There is a lack of research on muscle impairments, their relations with posture in IS (Parent, Ritchter, 2016). Aim – to assess relations between posture and trunk muscle functions in schoolaged girls with IS. Methods. The study included 20 patients with IS. Anthropometric measurements, measurements of posture (habitual standing posture, posture performing auto-correction and performing Matthias test), functional trunk stability evaluation, trunk muscle static endurance tests were used. Results. After performing auto-correction, thoracic kyphosis signifcantly decreased. Measurements showed decreased static trunk muscle endurance, normal proportions between trunk muscle groups: 75% of subjects have trunk instability. Trunk inclination, left major surface rotation statistically signifcantly changed in functional trunk stability test. Statistical moderate correlations were determined between both side trunk muscle static endurance and: medium surface rotation, major left surface rotation, medium lateral deviation. Also between Cobb angle and static endurance of left side trunk muscles. Changes of major left surface rotation in functional trunk stability test correlated with static endurance ratio of both sides trunk muscles. Statistical strong correlation was determined between major right lateral deviation and both sides muscles static endurance. Conclusions. School-aged girls with IS change kyphosis after auto-correction have low static endurance of trunk muscles and dysfunction of functional stability. Statistically moderate and strong correlations between posture parameters and trunk muscle functions were assessed.Keywords: posture, trunk muscle functions, idiopathic scoliosis, school-aged girls.

scholarly journals Analysis of trunk muscle EMG during rotational motion

2021 ◽  
Author(s):  
Nika Zolfaghari
Keyword(s):  
Rotational Motion ◽  
Muscle Activity ◽  
Trunk Muscle ◽  
Trunk Muscles ◽  
Wheelchair Users ◽  
Area Of Interest ◽  
Shoulder Muscles ◽  
Seated Balance ◽  
The Subject ◽  
Rotational Direction

The study of seated balance, specifically for the application of wheelchair users, has been an area of interest for quite some time. Unfortunately, most of the available studies to date have focused on upper limb and shoulder muscles, and little has been done analyzing the activity of trunk muscles (abdominal and back). For the purpose of this study, motorized rotational motion in the forward and backward directions at ±45 degrees was simulated, and the corresponding trunk muscle activity of nine healthy subjects was recorded by surface electromyography (EMG) for eight muscles, including an analysis on the effect of holding on to a harness for support, coupled with the presence of a visual input. The collected raw data was filtered, and the produced results illustrated that the muscle activity was greatest in the forward rotational direction, when the subject was holding on to a harness for support, with visuals present.

The Effects of Lifting Posture on Trunk Muscle Activity

1992 ◽  
Vol 36 (10) ◽  
pp. 742-746
Author(s):  
Christopher A. Hamrick ◽  
Sean Gallagher
Keyword(s):  
Muscle Activity ◽  
Latissimus Dorsi ◽  
Trunk Muscle ◽  
Trunk Muscles ◽  
Oblique Muscle ◽  
Left And Right ◽  
External Oblique ◽  
Four Levels ◽  
The Right ◽  
Guidelines And Recommendations

Trunk muscle activity of twelve healthy males with coal mining experience was examined while each subject lifted a box under various conditions. The independent variables were four levels of posture (kneeling, stooped under a 1.2 m roof, stooped under a 1.6 m roof, and standing), height to which the box was lifted (35 cm or 70 cm), and weight of the lifting box (15 kg, 20 kg, or 25 kg). The dependent variables were the peak EMG values recorded during a lift for each of eight trunk muscles (left and right erectores spinae, left and right latissimus dorsi, left and right external oblique, and left and right rectus abdominis). Posture and weight of lift significantly affected peak activity of the left and right erectores spinae, the left and right latissimus dorsi muscles, and the right external oblique muscle. The latissimus dorsi muscle activity was highest in the low stooping posture, and was lowest in the kneeling posture, while erectores spinae activity was highest in the kneeling posture and decreased as the trunk became more flexed. Thus, the muscle activity during lifting tasks is affected by restricting a worker's posture. Consequently, many lifting guidelines and recommendations currently in use may not be directly applicable to work being performed in restricted postures.

Hip and Trunk Muscle Activity During the Star Excursion Balance Test in Healthy Adults

2019 ◽  
Vol 28 (7) ◽  
pp. 682-691 ◽  
Author(s):  
Kunal Bhanot ◽  
Navpreet Kaur ◽  
Lori Thein Brody ◽  
Jennifer Bridges ◽  
David C. Berry ◽  
...  
Keyword(s):  
Dynamic Balance ◽  
Gluteus Maximus ◽  
Gluteus Medius ◽  
Healthy Adults ◽  
Rectus Abdominis ◽  
Erector Spinae ◽  
Trunk Muscles ◽  
Electromyographic Activity ◽  
Balance Test ◽  
External Oblique

Context:Dynamic balance is a measure of core stability. Deficits in the dynamic balance have been related to injuries in the athletic populations. The Star Excursion Balance Test (SEBT) is suggested to measure and improve dynamic balance when used as a rehabilitative tool.Objective:To determine the electromyographic activity of the hip and the trunk muscles during the SEBT.Design:Descriptive.Setting:University campus.Participants:Twenty-two healthy adults (11 males and 11 females; 23.3 [3.8] y, 170.3 [7.6] cm, 67.8 [10.3] kg, and 15.1% [5.0%] body fat).Intervention:Surface electromyographic data were collected on 22 healthy adults of the erector spinae, external oblique, and rectus abdominis bilaterally, and gluteus medius and gluteus maximus muscle of the stance leg. A 2-way repeated measures analysis of variance was used to determine the interaction between the percentage maximal voluntary isometric contraction (%MVIC) and the reach directions. The %MVIC for each muscle was compared across the 8 reach directions using the Sidak post hoc test withαat .05.Main Outcome Measures:%MVIC.Results:Significant differences were observed for all the 8 muscles. Highest electromyographic activity was found for the tested muscles in the following reach directions—ipsilateral external oblique (44.5% [38.4%]): anterolateral; contralateral external oblique (52.3% [40.8%]): medial; ipsilateral rectus abdominis (8% [6.6%]): anterior; contralateral rectus abdominis (8% [5.3%]): anteromedial; ipsilateral erector spinae (46.4% [20.2%]): posterolateral; contralateral erector spinae (33.5% [11.3%]): posteromedial; gluteus maximus (27.4% [11.7%]): posterior; and gluteus medius (54.6% [26.1%]): medial direction.Conclusions:Trunk and hip muscle activation was direction dependent during the SEBT. This information can be used during rehabilitation of the hip and the trunk muscles.

Sign in / Sign up

Export Citation Format

Share Document