A comparison of muscle activity, posture and body discomfort during the use of different computer screen sizes

Sengsoon, Praphatson; Siriworakunsak, Kanruethai

doi:10.1080/10803548.2022.2054543

Cited by 3 publications

(4 citation statements)

References 33 publications

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“…These findings were consistent with previous studies that found that upper trapezius muscle activity in subjects with mild or no symptomatic neck pain contributed to the low distribution of upper trapezius muscle activity and that monotonous work tasks resulted in low-threshold motor unit activity in the trapezius muscle; therefore, the RMS in continuous EMG measurements of muscle activity was found to be constant. 16 , 35 Another reason might be that motor unit recruitment of the upper trapezius muscle was greater than usual, often seen in high neck pain groups. 30 In addition, this study also found that upper trapezius muscle activity was not significantly different within the groups for both the symptomatic and asymptomatic groups after 1 hour of computer use.…”

Section: Discussionmentioning

confidence: 99%

“…The values were reported as root-mean-square (RMS) amplitude for 1 minute in 15-minute intervals for 1 hour. 16 , 17 Electrodes were attached to the following muscle sites to receive the EMG signal on the right side of all participants: anterior scalene muscle: one-third way between the sternal notch and the mastoid process in a supine position 17 ; upper trapezius muscle: mid-distance between the seventh cervical vertebra and the acromion process of the scapula 16 ; lower trapezius muscle: mid-distance between the vertebral border of the spine of the scapula and the seventh thoracic vertebra 18 ; serratus anterior muscle: mid-distance between the fourth and sixth rib in the axillary line 9 ; semispinalis muscle: 2.5 cm from the second cervical vertebra 19 ; wrist extensor muscles: one-third way between the lateral humeral epicondyle and the radial styloid process. 20 …”

Section: Methodsmentioning

confidence: 99%

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Effects of 1-hour computer use on ulnar and median nerve conduction velocity and muscle activity in office workers

Threesittidath,

Chaibal,

Nitayarak

2024

Journal of Occupational Health

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Objectives: To compare the effects of the one-hour computer use on ulnar and median nerve conduction velocity and muscle activity in symptomatic neck pain and asymptomatic office workers. Methods: A total of 40 participants, both male and female office workers, with symptomatic neck pain (n = 20) and asymptomatic (n = 20), were recruited. Pain intensity, ulnar nerve conduction velocity, median nerve conduction velocity, and muscle activity were conducted before and after one hour of computer use. Results: A significant increase in pain intensity in the neck area in both groups (p < 0.001). The symptomatic neck pain group revealed a significant decrease in the sensory nerve conduction velocity of the ulnar nerve (p = 0.008), while there was no difference in the median nerve conduction velocity (p > 0.05). Comparing before and after computer use, the symptomatic neck pain group had less muscle activity of the semispinalis muscles and higher anterior scalene muscle activity than the asymptomatic group (p < 0.05). The trapezius and wrist extensor muscles showed no significant difference in both groups (p > 0.05). Conclusions: This study found signs of neuromuscular deficit of the ulnar nerve, semispinalis muscle and anterior scalene muscle after one hour of computer use among office workers with symptomatic neck pain, which may indicate the risk of neuromuscular impairment of the upper extremities. The recommendation of resting, encouraging function and flexibility of the neuromuscular system after one hour of computer use should be considered.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Effects of 1-hour computer use on ulnar and median nerve conduction velocity and muscle activity in office workers

Threesittidath,

Chaibal,

Nitayarak

2024

Journal of Occupational Health

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“…The results of the RULA approach showed that an action level of 3 (meaning that "investigation and change are required soon") was necessary when the stand was not used. Across various body regions, it was observed that the wrist maintained an inappropriate bending angle of up to 15° without using the stand, posing a risk factor for wrist MSDs like carpal tunnel syndrome ( 25 , 26 ). Furthermore, positioning a laptop on the desk without a stand led to increased neck bending away from the neutral position, potentially resulting in higher scores in the RULA technique ( 27 ).…”

Section: Discussionmentioning

confidence: 99%

Ergonomic Design and Assessment of an Adjustable Laptop Stand Used in the Typing Task

Ghadimi,

Garosi,

Izadi Laybidia

et al. 2023

MJIRI

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Background Laptops are ubiquitous tools in today's society; however, their prolonged use often leads to discomfort and musculoskeletal disorders due to their nonergonomic design. This study aimed to evaluate the effectiveness of an innovative adjustable laptop stand in enhancing comfort and productivity during typing tasks. Methods A 2-phase experimental design was employed. Phase 1 involved the development of a novel laptop stand considering ergonomic principles and expert recommendations. In Phase 2, a total of 25 office workers—13 men and 12 women—participated in 3 randomized sessions of a 2-hour typing task. They used the newly designed stand, adjusted their laptop height using conventional methods, or completed the task without any height adjustment (control). The Local Subjective Discomfort Questionnaire (LPD), the Rapid Upper Limb Assessment (RULA), and speed and error rates were used to measure postural risk, subjective discomfort, and typing performance, respectively, during each session. SPSS Version 26 (IBM) was used for the analysis, and P ˂ 0.05 was considered statistically significant. Results The RULA scores were significantly lower with the newly designed stand compared with the other conditions. When using the stand, perceived discomfort in specific regions significantly decreased ( P < 0.05). Moreover, the number of typing errors significantly reduced with the stand ( P < 0.05), while no significant difference was observed in typing speed ( P = 0.371). Conclusion The novel adjustable laptop stand significantly reduced discomfort and improved typing accuracy during typing tasks, suggesting its potential to enhance user comfort and productivity. However, further longitudinal studies are needed to assess the long-term effects of this intervention.

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“…Most symptoms were reported in the neck (84.6%), upper back/shoulder areas (65.4%) [ 18 ]. In Thailand, a few studies have surveyed the prevalence of WMSDs among university students and office workers and found that WMSDs were prevalent in the neck, shoulders, and lower back areas [ [19] , [20] , [21] ]. This may be due to inappropriate ergonomic posture, prolonged awkward posture, long working hours, or inadequate resting time.…”

Section: Discussionmentioning

confidence: 99%

Prevalence and factor associated work-related musculoskeletal disorders of students in virtual classroom

Srirug,

Jongjit,

Muansri

et al. 2023

Heliyon

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A comparison of muscle activity, posture and body discomfort during the use of different computer screen sizes

Cited by 3 publications

References 33 publications

Effects of 1-hour computer use on ulnar and median nerve conduction velocity and muscle activity in office workers

Effects of 1-hour computer use on ulnar and median nerve conduction velocity and muscle activity in office workers

Ergonomic Design and Assessment of an Adjustable Laptop Stand Used in the Typing Task

Prevalence and factor associated work-related musculoskeletal disorders of students in virtual classroom

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