scholarly journals Effects of Same-Sided and Cross-Body Load Carrying on the Activity of the Upper Trapezius and Erector Spinae Muscles

2017 ◽  
Vol 1 (1) ◽  
pp. 2-6
Author(s):  
Lee Wonh-wee
Keyword(s):  
Erector Spinae ◽  
Upper Trapezius ◽  
Load Carrying ◽  
Body Load

scholarly journals Standing Up from a Chair with an Asymmetrical Initial Foot Position Decreases Trunk and Masticatory Muscle Activities in Healthy Young Men

Healthcare ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 480
Author(s):  
Youngsook Bae
Keyword(s):  
Muscle Activation ◽  
Young Men ◽  
Rectus Femoris ◽  
Erector Spinae ◽  
Masticatory Muscle ◽  
Cross Sectional ◽  
Upper Trapezius ◽  
Trunk Inclination ◽  
Trunk Kinematics ◽  
Foot Position

This study aimed to identify the activation of lower extremity, trunk, and masticatory muscle and trunk kinematics of the initial foot position during the sit-to-stand (STS) movement. Sixteen young men participated in this cross-sectional pilot study and performed STS using both symmetrical and asymmetrical foot positions. Activation of the tibialis anterior (TA), gastrocnemius lateral head (GA), rectus femoris (RF), biceps femoris (BF), rectus abdominis, erector spinae (ES), sternocleidomastoid (SCM), upper trapezius (UT), temporalis (TE), and masseter muscles in the dominant side was determined. For trunk kinematics, head and trunk velocities, front-back (For-Back) and mediolateral (Med-Lat) weight translation rates, and trunk inclination were measured. GA, TA, BF, and RF activation significantly increased, whereas ES, SCM, UT, and TE activation significantly decreased when using the asymmetrical foot position. Head velocity, For-Back, Med-Lat, and trunk inclination were also significantly decreased. In conclusion, the asymmetrical foot position increases muscle activation in the lower extremities and decreases trunk inclination. In addition, ES, UT, and TE muscle activity decreases at the initial asymmetrical foot position.

Playing the Clarinet: Influence of Body Posture on Muscle Activity and Sound Quality

2017 ◽  
Vol 32 (3) ◽  
pp. 125-131 ◽  
Author(s):  
VAE Baadjou ◽  
MDF van Eijsden-Besseling ◽  
JAMCF Verbunt ◽  
RA de Bie ◽  
RPJ Geers ◽  
...  
Keyword(s):  
Exercise Therapy ◽  
Muscle Activity ◽  
Activity Patterns ◽  
Sound Quality ◽  
Body Posture ◽  
Erector Spinae ◽  
Sitting Posture ◽  
Upper Trapezius ◽  
Left And Right ◽  
Postural Exercise

Musculoskeletal complaints are highly prevalent in clarinetists and are related to high arm load while playing. It is hypothesized that postural exercise therapy may be used to adapt muscle activity patterns while playing and thus contribute to better sound quality. The goal of the present study was to investigate the relationship between body posture, muscle activity, and sound quality in clarinetists while playing the instrument in two different postures, their habitual sitting posture (control, CO) vs an experimental sitting posture (EXP) based on Mensendieck postural exercise therapy, method Samama. Twenty healthy professional and student clarinet players, aged 18–60 years, were included in this cross-sectional study. Participants played a 60-second musical excerpt in CO, followed by instruction on the EXP body posture, and then played in the EXP condition. Two-dimensional goniometric analysis was used to calculate body posture; muscle activity was measured bilaterally using surface electromyography. In EXP, a significantly smaller low thoracic angle, smaller high thoracic angle, and larger pelvic tilt angle (all p<0.001) were found. EMG results indicated that the left and right erector spinae L3 and left and right lower trapezius were more active in EXP compared to CO, whereas left upper trapezius and right brachioradialis were less active in EXP than CO. Most participants experienced better sound quality in EXP, whereas blinded experts found no consistent pattern between body posture and sound quality. To conclude, it seems that postural exercise therapy may change muscle activity patterns. By increasing stability, a decrease in activity of the upper extremity muscles can be induced.

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.

Effects of Dual Monitor Computer Work Versus Laptop Work on Cervical Muscular and Proprioceptive Characteristics of Males and Females

2017 ◽  
Vol 59 (4) ◽  
pp. 546-563 ◽  
Author(s):  
Amanda M. Farias Zuniga ◽  
Julie N. Côté
Keyword(s):  
Muscle Activity ◽  
Young Male ◽  
Erector Spinae ◽  
Computer Work ◽  
Upper Body ◽  
Protective Effects ◽  
Desktop Computer ◽  
Normalized Mutual Information ◽  
Upper Trapezius ◽  
Objective Evidence

Objective: The effects of performing a 90-minute computer task with a laptop versus a dual monitor desktop workstation were investigated in healthy young male and female adults. Background: Work-related musculoskeletal disorders are common among computer (especially female) users. Laptops have surpassed desktop computer sales, and working with multiple monitors has also become popular. However, few studies have provided objective evidence on how they affect the musculoskeletal system in both genders. Methods: Twenty-seven healthy participants (mean age = 24.6 years; 13 males) completed a 90-minute computer task while using a laptop or dual monitor (DualMon) desktop. Electromyography (EMG) from eight upper body muscles and visual strain were measured throughout the task. Neck proprioception was tested before and after the computer task using a head-repositioning test. EMG amplitude (root mean square [RMS]), variability (coefficients of variation [CV]), and normalized mutual information (NMI) were computed. Results: Visual strain ( p < .01) and right upper trapezius RMS ( p = .03) increased significantly over time regardless of workstation. Right cervical erector spinae RMS and cervical NMI were smaller, while degrees of overshoot (mean = 4.15°) and end position error (mean = 1.26°) were larger in DualMon regardless of time. Effects on muscle activity were more pronounced in males, whereas effects on proprioception were more pronounced in females. Conclusion: Results suggest that compared to laptop, DualMon work is effective in reducing cervical muscle activity, dissociating cervical connectivity, and maintaining more typical neck repositioning patterns, suggesting some health-protective effects. Application: This evidence could be considered when deciding on computer workstation designs.

scholarly journals Guidelines for Working Heights of the Lower-Limb Exoskeleton (CEX) Based on Ergonomic Evaluations

2021 ◽  
Vol 18 (10) ◽  
pp. 5199
Author(s):  
Yong-Ku Kong ◽  
Chae-Won Park ◽  
Min-Uk Cho ◽  
Seoung-Yeon Kim ◽  
Min-Jung Kim ◽  
...  
Keyword(s):  
Lower Limb ◽  
Muscle Activity ◽  
Biceps Brachii ◽  
Erector Spinae ◽  
Whole Body ◽  
Emg Activity ◽  
Triceps Brachii ◽  
Lower Limb Exoskeleton ◽  
Upper Trapezius ◽  
Subjective Discomfort

The aim of this study was to evaluate the muscle activities and subjective discomfort according to the heights of tasks and the lower-limb exoskeleton CEX (Chairless EXoskeleton), which is a chair-type passive exoskeleton. Twenty healthy subjects (thirteen males and seven females) participated in this experiment. The independent variables were wearing of the exoskeleton (w/ CEX, w/o CEX), working height (6 levels: 40, 60, 80, 100, 120, and 140 cm), and muscle type (8 levels: upper trapezius (UT), erector spinae (ES), middle deltoid (MD), triceps brachii (TB), biceps brachii (BB), biceps femoris (BF), rectus femoris (RF), and tibialis anterior (TA)). The dependent variables were EMG activity (% MVC) and subjective discomfort rating. When wearing the CEX, the UT, ES, RF, and TA showed lower muscle activities at low working heights (40–80 cm) than not wearing the CEX, whereas those muscles showed higher muscle activities at high working heights (100–140 cm). Use of the CEX had a positive effect on subjective discomfort rating at lower working heights. Generally, lower discomfort was reported at working heights below 100 cm when using the CEX. At working heights of 100–140 cm, the muscle activity when wearing the CEX tended to be greater than when not wearing it. Thus, considering the results of this study, the use of the lower-limb exoskeleton (CEX) at a working height of 40–100 cm might reduce the muscle activity and discomfort of whole body and decrease the risk of related disorders.

scholarly journals Effect of Using an 8-Figure Shoulder Brace on Posture and Muscle Activities during the Performance of Dental Hygiene Procedures

2020 ◽  
Vol 17 (22) ◽  
pp. 8494
Author(s):  
Tae-Lim Yoon ◽  
Ji-Hyun Min ◽  
Han-Na Kim
Keyword(s):  
Dental Hygiene ◽  
Erector Spinae ◽  
Dental Hygienists ◽  
Work Related ◽  
Upper Trapezius ◽  
Shoulder Joints ◽  
Scaling Procedure ◽  
Work Related Musculoskeletal Disorders ◽  
Lumbar Extension ◽  
Shoulder Brace

The incidence of work-related musculoskeletal disorders (MSDs) among dental workers has been increasing. Many ergonomic devices and accessories have been introduced. The aim of this study was to investigate the effects of an 8-figure shoulder brace on posture-related muscle activities in dental hygiene practitioners during scaling procedures. In this study, 33 participants (age: 21.9 ± 2.1 years, height: 162.0 ± 6.0 cm, weight: 55.8 ± 9.0 kg, body mass index: 21.2 ± 2.4 kg/m2) performed the scaling procedure with and without the 8-figure shoulder brace in a randomized order. The normalized electromyography activity in the amplitude probability distribution function and joint angles (cervical, thoracic, lumbar, and shoulder joints) were simultaneously recorded during scaling. A paired t test was used to compare the differences in muscle kinematics, with the alpha level set at 0.05. The dental hygienists who wore the 8-figure shoulder brace during scaling showed thoracic and lumbar extension, improved sitting postures, and reduced shoulder joint abduction. However, we also observed an unintended increase in internal rotation. Use of the 8-figure shoulder brace could prevent work-related MSDs in lumbar and thoracic regions by reducing the effort exerted by the upper trapezius and deltoid muscles, despite the increased muscular effort of the cervical erector spinae.

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