scholarly journals The Surface EMG Characteristics between Erector Spinae and Vastus Lateralis during Bending Forward and Squatting Down Tasks

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Jinzhuang Xiao ◽  
Junmin Gao ◽  
Hongrui Wang ◽  
Kun Liu ◽  
Xincai Yang
Keyword(s):  
Theoretical Basis ◽  
Healthy Subjects ◽  
Vastus Lateralis ◽  
Surface Emg ◽  
Physical Activities ◽  
Erector Spinae ◽  
Median Frequency ◽  
Low Back ◽  
The Right ◽  
Daily Physical Activities

Bending forward and squatting down are two common physical tasks in everyday life and at work. This study determined the sEMG characteristics between erector spinae and vastus lateralis during bending forward and squatting down tasks by analyzing the regularity of variation in sEMG frequency domain index-median frequency (MNF) in healthy subjects. The results indicate that sEMG activities in erector spinae are significantly higher than those in the right vastus lateralis during bending forward task. Instead, in squatting down task, sEMG activities in the right vastus lateralis are significantly greater than those in erector spinae. It also shows that the fatigue degree of low back caused by trunk bending is much deeper than that by squatting down. The ratio scope of one-order fitting values of MNF between erector spinae and vastus lateralis ranges from 0.87 to 1.72 among 80% of subjects during bending forward task and ranges from 0.31 to 1.11 during squatting down task. This study provides certain theoretical basis for using the strength of low back in a proper way to avoid getting it hurt in daily physical activities.

Wearing an Inflatable Vest Alters Muscle Activation and Trunk Angle While Paddling a Surfboard

2017 ◽  
Vol 33 (4) ◽  
pp. 282-287 ◽  
Author(s):  
Jeff A. Nessler ◽  
Thomas Hastings ◽  
Kevin Greer ◽  
Sean C. Newcomer
Keyword(s):  
Muscle Activation ◽  
Random Order ◽  
Surface Emg ◽  
Erector Spinae ◽  
Low Back ◽  
Upper Trapezius ◽  
Lower Back ◽  
The Right ◽  
Trunk Extension ◽  
Order Surface

Low back pain is a commonly reported problem among recreational surfers. Some individuals report that wearing a vest with an inflatable bladder that alters trunk angle may help to alleviate pain. The purpose of this study was to determine whether such a vest has an effect on muscle activation and extension of the lower back. Twelve recreational surfers completed 12 paddling trials at 1.1 m/s in a swim flume on both a shortboard and a longboard on 2 separate days. Three conditions of no vest, vest uninflated, and vest inflated were presented to participants in random order. Surface EMG and trunk angle were acquired via wireless sensors placed over the right erector spinae, mid-trapezius, upper trapezius, and latissimus dorsi. Wearing the inflated vest affected muscle activation: erector spinae and mid-trapezius demonstrated a significant decrease in activation relative to wearing no vest (12% and 18% respectively, p < .05). Trunk extension was also significantly reduced when the vest was inflated (18% reduction, p < .05). Results were similar for both the short and longboard, though this effect was greater while paddling the larger board. These results suggest that a properly inflated vest can alter trunk extension and muscle activity while paddling a surfboard in water.

scholarly journals An Intramuscular Epidermal Cyst of Erector Spinae Muscles: A Case Report

2020 ◽  
pp. 1-3
Author(s):  
Seung Won Park ◽  
Jong Han Gill ◽  
Myeong Jin Ko ◽  
Seong Hyun Wui ◽  
Seung Won Park
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Subcutaneous Tissue ◽  
Erector Spinae ◽  
Epidermal Cyst ◽  
Low Back ◽  
Palpable Mass ◽  
Spinal Magnetic Resonance Imaging ◽  
Local Tenderness ◽  
The Right

An intramuscular epidermal cyst without subcutaneous involvement is extremely rare. The patient presented with low back pain. Spinal magnetic resonance imaging indicated spindle-shaped mass in the right erector spinae muscles located at L3 to L5 level without any connection with subcutaneous tissue. The patient underwent operation for removal of intramuscular cystic lesion. The tumor was totally removed and pathologically confirmed with epidermal cyst. Unlike typical epidermal cyst, the patient had a characteristic clinical manifestation of mild low back pain without palpable mass and local tenderness.

scholarly journals The Electromyographic Threshold in Girls and Women

2017 ◽  
Vol 29 (1) ◽  
pp. 84-93 ◽  
Author(s):  
Devon Long ◽  
Raffy Dotan ◽  
Brynlynn Pitt ◽  
Brandon McKinlay ◽  
Thomas D. O’Brien ◽  
...  
Keyword(s):  
Muscle Activation ◽  
Vastus Lateralis ◽  
Regression Line ◽  
Surface Emg ◽  
Cycle Ergometry ◽  
High Threshold ◽  
Type Ii ◽  
Progressive Exercise ◽  
Muscular Function ◽  
The Right

Background:The electromyographic threshold (EMGTh) is thought to reflect increased high-threshold/type-II motor-unit (MU) recruitment and was shown higher in boys than in men. Women differ from men in muscular function.Purpose:Establish whether females’ EMGTh and girls–women differences are different than males’.Methods:Nineteen women (22.9 ± 3.3yrs) and 20 girls (10.3 ± 1.1yrs) had surface EMG recorded from the right and left vastus lateralis muscles during ramped cycle-ergometry to exhaustion. EMG root-mean-squares were averaged per pedal revolution. EMGTh was determined as the least residual sum of squares for any two regression-line data divisions, if the trace rose ≥ 3SD above its regression line. EMGTh was expressed as % final power-output (%Pmax) and %VO2pk power (%PVO2pk).Results:EMGTh was detected in 13 (68%) of women, but only 9 (45%) of girls (p < .005) and tended to be higher in the girls (%Pmax= 88.6 ± 7.0 vs. 83.0 ± 6.9%, p = .080; %PVO2pk= (101.6 ± 17.6 vs. 90.6 ± 7.8%, p = .063). When EMGTh was undetected it was assumed to occur at 100%Pmax or beyond. Consequently, EMGTh values turned significantly higher in girls than in women (94.8 ± 7.4 vs. 88.4 ± 9.9%Pmax, p = .026; and 103.2 ± 11.7 vs. 95.2 ± 9.9%PVO2pk, p = .028).Conclusions:During progressive exercise, girls appear to rely less on higher-threshold/type-II MUs than do women, suggesting differential muscle activation strategy.

Hip Adduction Does not Affect VMO EMG Amplitude or VMO:VL Ratios during a Dynamic Squat Exercise

2006 ◽  
Vol 15 (3) ◽  
pp. 195-205 ◽  
Author(s):  
Michelle Boling ◽  
Darin Padua ◽  
J. Troy Blackburn ◽  
Meredith Petschauer ◽  
Christopher Hirth
Keyword(s):  
Outcome Measures ◽  
Knee Flexion ◽  
Healthy Subjects ◽  
Vastus Lateralis ◽  
Test Session ◽  
Surface Emg ◽  
Knee Extension ◽  
Emg Amplitude ◽  
Squat Exercise ◽  
History Of

Context:Clinicians commonly attempt to facilitate vastus medialis oblique (VMO) activity by instructing patients to squeeze a ball between their knees during squatting exercises.Objective:To determine whether VMO activation amplitude and the VMO to vastus lateralis (VL) activation ratio (VMO:VL) were altered when performing active hip adduction during a dynamic squat exercise.Design:Single test session.Participants:Fifteen healthy subjects, with no history of knee pain, volunteered for this study.Intervention:Surface EMG of the VMO, VL, and hip adductor (ADD) muscles were recorded while subjects performed 10 consecutive squats against their body weight through a range of 0° to 90° of knee flexion. Subjects performed the squat exercises during two different conditions: (1) active hip adduction and (2) no hip adduction.Main Outcome Measures:Average VMO EMG amplitude and VMO:VL ratio were determined during the knee flexion (0° to 90°) and knee extension (90° to 0°) phases of the squat exercise.Results:Active hip adduction did not significantly change VMO amplitude or VMO:VL ratio during the knee flexion or knee extension phases of the dynamic squat exercise.Conclusions:Based on these results, we conclude that VMO amplitude and the VMO: VL ratio are not influenced by performing active hip adduction during a dynamic squat exercise in healthy subjects.

scholarly journals MRI Assessment of Degeneration of Multifidus and Erector Spinae Muscles in Patients with Chronic Low Back Pain

2021 ◽  
Author(s):  
Alikemal Yazici ◽  
Tuba Yerlikaya ◽  
Adile Oniz
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Chronic Low Back Pain ◽  
Erector Spinae ◽  
Low Back ◽  
Cross Sectional ◽  
Fat Infiltration ◽  
Significant Difference ◽  
Healthy Control ◽  
The Right

Abstract Background The aim of this study was to examine degeneration in the lumbar musculus multifidus (L.MF) and lumbar musculus erector spina (L.ES) muscles in patients with mechanical chronic low back pain, non-radiculopathy chronic low back pain with discopathy, and healthy individuals. The relationships with low back pain were examined by comparing the results according to gender, pain, and lumbar segments. Material and Method: Evaluation was made of 36 healthy control subjects (Group 1), 37 patients with mechanical low back pain (Group 2) and 41 non-radiculopathy, lumbar discopathy patients (Group 3). On axial magnetic resonance images at the L3-S1 level, asymmetry between the left and right sides was examined in respect of L.MF and L.ES surface cross-sectional areas (CSA), total surface cross-sectional area (TCSA = L.MF + L.ES), and fat infiltration. Results The mean CSA values showed a significant difference only in the right L.MF in the healthy control group (p = 0.011). No statistically significant difference was seen between the groups in the comparisons of TCSA, and a statistically significant difference was determined in respect of fat infiltration in the right and left L.MF and the left L.ES (p = 0.011, p = 0.001, p = 0.027, respectively). When the CSA and TCSA were examined according to gender within the groups, the values were found to be statistically significantly higher in males (p < 0.001). The CSA and TCSA values of the L.MF and L.ES showed a significant difference between segments (L3-L4, L4-L5, L5-S1) (p < 0.001). No asymmetry was observed between the left /right CSA and TCSA values of the groups. Fat infiltration showed a significant difference according to gender and segments (p < 0.001). Conclusion Fat infiltration in the L.MF muscle is related to mechanical low back pain and lumbar discopathy. That there was no difference between the groups in the CSA and TCSA values demonstrates the need for measurement of muscle atrophy associated with fat infiltration or functional cross-section area rather than CSA and TCSA.

Trunk Muscle Activation While Resisting Asymmetrically Applied Loads in an Axially Rotated Posture

1992 ◽  
Vol 36 (10) ◽  
pp. 752-756
Author(s):  
Steven A. Lavender ◽  
Yang-Hwei Tsuang ◽  
Gunnar B.J. Andersson
Keyword(s):  
Muscle Activation ◽  
Surface Emg ◽  
Erector Spinae ◽  
Trunk Muscles ◽  
Rectus Abdominus ◽  
Left And Right ◽  
External Oblique ◽  
The Right ◽  
Main Effects ◽  
Univariate Analyses

The present investigation describes the electromyographic (EMG) response of eight trunk muscles during the application of loads to the torso while subjects maintained a twisted posture. The external moments of 20 and 40 Nm were applied to a harness system as each of the 10 subjects twisted 25 degrees. The applied moment direction was varied in 3 0 degree increments completely around the subjects (0 to 33 0 degrees). Surface EMG was used to monitor the left and right Latissimus Dorsi, Erector Spinae, External Oblique, and Rectus Abdominus. Multivariate and univariate analyses of variance (MANOVA and ANOVA) procedures showed significant main effects for all muscles and a significant moment magnitude by moment direction interaction effect in 6 of the 8 muscles. The greatest muscle activity was observed in the right Erector Spinae and the left External Oblique muscles. The results are also compared with an earlier study in which a similar loading paradigm was used as subject maintained a neutral upright posture.

Effects of kinesio taping on neck-shoulder discomfort and EMG responses during smartphone texting in healthy young adults

Work ◽  
2020 ◽  
Vol 67 (4) ◽  
pp. 847-854
Author(s):  
Pattanasin Areeudomwong ◽  
Wasuphol Bootsast ◽  
Chalalai Thapthimthong ◽  
Patchareeporn Manop ◽  
Vitsarut Buttagat
Keyword(s):  
Young Adults ◽  
Erector Spinae ◽  
Trunk Muscles ◽  
Clinical Settings ◽  
Median Frequency ◽  
Mean Square ◽  
Serratus Anterior ◽  
Kinesio Taping ◽  
Lower Trapezius ◽  
The Right

BACKGROUND: While kinesio taping (KT) is used in several clinical settings to correct posture and reduce pain, KT effects during smartphone texting are unknown. OBJECTIVE: To investigate the effects among healthy young adults of KT on neck-shoulder discomfort and electromyographic (EMG) responses of neck and upper trunk muscles during smartphone texting. METHODS: Twenty-four participants performed a 30-minute texting task on a smartphone using both hands at two separate times under one of two conditions: KT on the right shoulder and no taping. Neck-shoulder discomfort was assessed, along with the normalized root mean square (NRMS) and normalized median frequency (NMF) of the right cervical erector spinae (CES), lower trapezius (LT), and serratus anterior (SA). RESULTS: Compared to baseline, both groups had significantly greater neck-shoulder discomfort, and NRMS and NMF of all muscles (p < 0.001) after performing a 30-minute texting task. Comparing between groups, the KT group experienced significantly less neck-shoulder discomfort, and demonstrated delayed deterioration of NRMS and NMF of right CES and LT muscles (p < 0.05). CONCLUSIONS: During smartphone texting, KT on the shoulder decreased neck-shoulder discomfort and delayed reduction of activation and fatigue of neck and upper trunk muscles among healthy young adults.

scholarly journals MRI Assessment of Degeneration of Multifidus and Erector Spinae Muscles in Patients With Chronic Low Back Pain

2021 ◽  
Author(s):  
Alikemal Yazici ◽  
Tuba Yerlikaya ◽  
Adile Oniz
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Erector Spinae ◽  
Low Back ◽  
Sectional Area ◽  
Healthy Individuals ◽  
Cross Sectional ◽  
Fat Infiltration ◽  
Significant Difference ◽  
The Right

Abstract Background: The aim of this study was to investigate the degeneration of lumbar musculus multifidus (L.MF) and lumbar musculus erector spinae (L.ES) muscles in healthy individuals and patients with mechanical low back pain and lumbar discopathy without root compression (radiculopathy), and to examine the relationship between low back pain by comparing the results according to gender, pain and lumbar segments between the groups. Methods: The study included 30 healthy individuals (Group 1), 30 patients with mechanical low back pain (Group 2) and 30 patients with lumbar discopathy without root compression (radiculopathy) (Group 3). Pain severity was evaluated using a Visual Analogue Scale (VAS). Right and left L.MF and L.ES cross-sectional areas (CSA), total cross-sectional areas (TCSA =L.MF+L.ES), fat infiltrations, and asymmetries between the right and left sides were evaluated. L.MF and L.ES muscles CSA and TCSA, fat infiltrations, asymmetries between the right and left sides were evaluated in the patients at the L3-S1 level, in axial Magnetic Resonance Imaging.Results: The mean value of the CSA differed between the groups only in the right L.MF and in the healthy group (p=0.011). No statistically significant difference was observed between the TCSA values of the groups, but a significant difference was found between the groups in terms of fat infiltration in right and left L.MF and left L.ES (p=0.011, p=0.001, p=0.027, respectively). When CSA and TCSA were examined according to gender within the group, the values were found to be significantly higher in males (p<0.001). The CSA and TCSA values ​​of L.MF and L.ES differed between segments (L3-L4, L4-L5, L5-S1) (p<0.001). There was no asymmetry between the right/left CSA and TCSA of the groups. Fat infiltration differed according to gender (p=0.001) and segments (p<0.001).Conclusion: Fat infiltration in the lumbar multifidus muscle was associated with mechanical low back pain and lumbar discopathy. The fact that there was no difference between the cross-sectional area and the total cross-sectional area between the groups indicates the need to measure the FCSA or muscle atrophy due to fat infiltration in the evaluation of muscle mass, rather than CSA and TCSA.

The Effect of Patellar Taping on Quadriceps Activity Onset in the Absence of Pain

1999 ◽  
Vol 15 (4) ◽  
pp. 373-380 ◽  
Author(s):  
David Parsons ◽  
Wendy Gilleard
Keyword(s):  
Muscle Activation ◽  
Vastus Lateralis ◽  
Motor Units ◽  
Surface Emg ◽  
Mechanical Effect ◽  
Stair Ascent ◽  
Patella Position ◽  
The Right ◽  
Asymptomatic Subjects ◽  
Taping Technique

Patellofemoral taping is a technique used in the management of patellofemoral pain that has been shown to alter the pattern of muscle activation onset in symptomatic subjects. It is unknown, however, if this taping technique directly influences the patterns of muscle activity that controls patella position or if its benefits are more related to the effect of pain reduction. The purpose of this study was to investigate the effect of a taping technique on the muscle activation onset of selected quadriceps muscles where pain was not a confounding factor. Thirteen asymptomatic subjects completed a stair ascent and descent task with the right patella untaped and taped for a medial patella glide. Muscle activation onset was determined by computer algorithm from surface EMG of vastus lateralis (VL) and vastus medialis obliquus (VMO). Taping significantly delayed the muscle activation onset of VMO and VL during stair ascent. There was no significant change for stair descent. This effect may be an attempt by the motor control system to counter the mechanical effect of patella perturbation or may be due to cutaneous stimulation affecting threshold or recruitment of motor units.

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