Repeatability of electromyography normalization of the neck and shoulder muscles in symptomatic office workers

Chaikumarn, Montakarn; Nakphet, Nuttika; Janwantanakul, Prawit

doi:10.1080/10803548.2017.1314120

Cited by 16 publications

(8 citation statements)

References 44 publications

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“…Our reliability study of sEMG measurements during the three tasks confirmed that the sEMG is a reliable tool for the measurement of neck and shoulder muscle activity in dentists. These findings coincide with authors such as Chaikumarn et al [34], whose study population was office workers with cervical symptoms, and Machado et al [35], who performed measurements on women with and without neck-shoulder symptoms. We were unable to find reliability studies of the sEMG on dentists.…”

Section: Discussionsupporting

confidence: 90%

The Combination of Different Ergonomic Supports during Dental Procedures Reduces the Muscle Activity of the Neck and Shoulder

García-Vidal

López-Nicolás

Sánchez-Sobrado

et al. 2019

JCM

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Ergonomic supports have become popular for the prevention of musculoskeletal disorders. This study sought to evaluate the efficacy of different ergonomic supports and their combination to reduce muscle activity of the neck and shoulder muscles. A one-way repeated measures design was used to evaluate 36 practicing dentists while they performed three posterior composite restoration procedures on a phantom head. Portable surface electromyography (sEMG) recordings were used to measure the muscle activity of three muscles (Upper Trapezius, Lateral Deltoid and Anterior Deltoid) in the dominant upper extremity, with and without the use of different ergonomic supports (ergonomic stool, magnification lenses and both) during the performance of these tasks. A repeated measures analysis of variance was used. The muscle activity of all muscles differed significantly across the four ergonomic conditions during the three tasks. The use of ergonomic supports such as magnification lenses, the ergonomic stool, or the combination of both, is effective for decreasing the muscle activity of the three muscles during the three tasks, when compared to standard practice. In addition, the decrease of muscle activity was higher using magnification lenses when compared to the ergonomic stool. Furthermore, the greatest decrease was found with the combination of both supports.

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Section: Discussionsupporting

confidence: 90%

The Combination of Different Ergonomic Supports during Dental Procedures Reduces the Muscle Activity of the Neck and Shoulder

García-Vidal

López-Nicolás

Sánchez-Sobrado

et al. 2019

JCM

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“…An electromyographic activity is a neuromuscular response to biomechanical activity. The most widely used method to get the reference value of muscle activation for normalizing EMG signals has been the use of maximum voluntary isometric contraction [21][22][23]. During isometric contractions, a welldefined relationship exists between the magnitude of voluntary muscle activity and the EMG signal amplitude [24].…”

Section: Introductionmentioning

confidence: 99%

Prevalence of musculoskeletal disorders among Indian railway sahayaks

Khan

Singh

2018

International Journal of Occupational and Environmental Health

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Railway sahayak or also known as coolie is one of the oldest occupations in India. This occupational group is continuously subjected to various musculoskeletal problems due to repetitive load exertion in unnatural postures. The present research aims to examine the prevalence of musculoskeletal disorders (MSDs) among Indian railway sahayaks. A cross-sectional study has been conducted on a sample of 51 male sahayaks. With a modified Nordic questionnaire, data were collected on their demographics, work, and musculoskeletal pain history. Electromyography (EMG) of the upper trapezius muscle of selected 12 healthy sahayaks having no history of neck-shoulder complaints were analyzed under different load lifting and carrying conditions. Additionally, ergonomic risk levels were recorded using Rapid Entire Body Assessment method. The questionnaire revealed that for the past 1 year prevalence, the most affected body regions of railway sahayaks were neck (47%), shoulder (51%), lower back (43%), and knee (47%). The association between age group and MSDs in different body regions were found significant (p = 0.012 for neck, p = 0.017 for shoulder, etc.). Work experience also had a significant relation to the MSDs in different body regions (p = 0.013 for shoulder,p = 0.023 for calf, etc.). Analysis of variance reveals high significance level between EMG values and tasks performed by the sahayaks. In conclusion, railway sahayaks were found to have high rate of MSDs which may be associated with lifting/carrying heavy loads in awkward postures. Ergonomic interventions must be implemented to reduce the risk level on this group of workers.

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“…Additionally, to estimate a maximum voluntary contraction (MVC) for the upper trapezius, subjects placed their hand at 90 0 abduction, sitting down on a chair, and were asked to apply pressure against the exposed resistance at the top [25].…”

Section: Electromyographymentioning

confidence: 99%

“…Then, the head was anterolaterally placed and pressurised against the hand resistance [21]. To obtain the MVC for the erector spinae muscle, the subjects were asked to be in a prone posture and put both hands behind their head as moving the overhand against the resistance in the extension direction [25]. To achieve MVC for the diaphragm muscle in the sitting position subjects took deep breaths [26].…”

Section: Electromyographymentioning

confidence: 99%

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Effects of Adding Respiratory Exercises to the Therapeutic Routine in Smartphone Users With Forward Head Posture and Non-Specific Chronic Neck Pain: A Randomised Controlled Trial

Dareh-deh

Hadadnezhad

Letafkar

et al. 2020

Preprint

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Background: Neck pain and forward head posture are common in prolonged smartphone users and need to be targeted for treatment. We aimed to compare the effect of adding respiratory exercises to the therapeutic routine in smartphone users with forward-head posture and non-specific chronic neck pain.Mehods: Sixty patients (aged 24.7±2.1 years), were randomly assigned to the therapeutic routine (n=20), combined respiratory-exercises with therapeutic routine (n=20), or control groups (n=20). Each programme was implemented three times a week for 8 weeks. Forward head angle, pain, electromyographic activity, and respiratory patterns were measured at baseline and at 8-weeks’ post-treatment. Results: There were significant improvements in the combined group compared with the therapeutic routine group (p=0.03) for diaphragm muscle activation, (p=0.03), neck erector spinae activity (p=0.04), respiratory balance (p=0.04), and number of breaths (p=0.02). There were significant within-group changes from baseline to post-treatment in the combined group for all outcomes above, but no changes in the therapeutic exercise routine group. Outcomes for the combined group were superior to the control group in every variable. Conclusion: Combination treatment is more effective than the standard therapeutic routine. These results could be strengthened by more studies with longer follow-up assessments.Trial registration: Current Controlled Trials using the IRCT website with ID number of, IRCT20200212046469N1 “Prospectively registered” at 2020/03/04.

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Repeatability of electromyography normalization of the neck and shoulder muscles in symptomatic office workers

Abstract: Peak rms and MF from the MVIC normalization method can be measured with sufficient repeatability in symptomatic office workers.

Cited by 16 publications

References 44 publications

The Combination of Different Ergonomic Supports during Dental Procedures Reduces the Muscle Activity of the Neck and Shoulder

The Combination of Different Ergonomic Supports during Dental Procedures Reduces the Muscle Activity of the Neck and Shoulder

Prevalence of musculoskeletal disorders among Indian railway sahayaks

Effects of Adding Respiratory Exercises to the Therapeutic Routine in Smartphone Users With Forward Head Posture and Non-Specific Chronic Neck Pain: A Randomised Controlled Trial

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