Ergonomic evaluation of the effects of forearm conditions and body postures on trapezius muscle activity during smartphone texting

Tang, Zhichuan; Jin, Xuexue; Wu, Yanyou; Ma, Jialong; Xia, Dan; Dong, Yuejiao; Yang, Caimei

doi:10.1016/j.ergon.2021.103085

Cited by 19 publications

(6 citation statements)

References 43 publications

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“…If NF exceeds 15 • , CES activity increases substantially. However, the recommendation of no more than 15 • of NF during smartphone use does not reflect natural way of using the smartphones in real life situations [33] and is substantially different from the NF of 33 • -45 • and 44.7 • observed by Lee et al [14] and Ning et al [19], respectively. User NF was similarly observed to range from 45 • to 50 • for all postures in this study.…”

Section: Discussioncontrasting

confidence: 57%

“…However, NF was similar between genders (46.2° for men and 46.4° for women) during supported sitting because a backrest restricts body movement. Although static postures (especially sitting) tend to cause lower UT activation and higher fatigue levels and discomfort scores than dynamic postures [33], our findings revealed that NF was significantly lower among female users in either sitting position and among male users during supported sitting, indicating a lighter load on the neck [20]. This study has several limitations.…”

Section: Discussionmentioning

confidence: 57%

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Field Study of Postural Characteristics of Standing and Seated Smartphone Use

Chen

Cheng

et al. 2022

IJERPH

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Prior investigations have been primarily conducted in a laboratory to examine the effects of the smartphone use on the neck and head positions, whether these results are applicable to actual conditions is still unknown. This field survey thus analyzed the neck flexion (NF), head flexion (HF), gaze angle (GA), and viewing distance (VD) of smartphone users in public areas in Taipei, Taiwan. Six hundred smartphone users (300 men and 300 women) were photographed sagittally in standing, supported sitting, or unsupported sitting postures while using a smartphone. Results showed that women had significantly less NF and HF and shorter VDs than male users. Regardless of gender, higher NF was observed for standing than for sitting. Women had similar NF and HF while sitting supported and unsupported, but both were significantly lower than those while standing. By contrast, male users had higher NF and HF during unsupported sitting than during supported sitting. The NF (45°–50°) was much greater than the recommended maximum safe NF of 15°. Women may be at higher risk of visual strain because of shorter VD.

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Section: Discussioncontrasting

confidence: 57%

Section: Discussionmentioning

confidence: 57%

Field Study of Postural Characteristics of Standing and Seated Smartphone Use

Chen

Cheng

et al. 2022

IJERPH

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“…The sEMG has been widely used in the field of fatigue detection in various industries. Zhichuan et al [21], Na et al [22], Balasubramanian and Jagannath [23], and Li et al [24] used sEMG to evaluate the load of smartphone texting, manual material handling, motorcycle riding and other operations, including the judgment of muscle tension and fatigue status in different operating postures, positions and movements. In order to evaluate the effect of muscle workload and fatigue, the changes of muscle activity of workers operating brush cutters were analyzed by (sEMG) in this study.…”

Section: Discussionmentioning

confidence: 99%

Muscle fatigue related to human posture using a brush cutter for landscape gardening: a preliminary study

Yang¹,

Li²,

Li³

et al. 2022

Med Pr

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Background: Brush cutters are widely used in Chinese landscape gardening and agricultural laboring which leads the operators being exposed to many risks. Low back pain (LBP) is particularly common and can lead to substantial personal, community and financial burdens. The aim of the presented study was to measure the activity and function of each torso muscle of the operator when using the bush cutter, so as to evaluate the muscle injury of the operator during using several common brush cutters for different landscape tasks. Material and Methods: The human postures of 6 workers using 2 types of brush cutters in the 3 working conditions were recorded and measured by using a surface electromyography (sEMG) system and a camera. The test results were compared by t-test and sign test. The effect of human posture on the sEMG signal of trunk muscles in different working condition were analyzed by ANOVA. Results: In the 3 working conditions, except for the left trapezius muscle, the muscle load of operating the backpack brush cutter is higher than that of operating side-mounted brush cutter. When operating the side-mounted backpack brush cutter, the force on both sides of the trapezius muscle is uneven, the load of the left trapezius muscle is >25%, and the maximum value is >30%. Conclusions:The results highlighted significant differences in the effects of different working postures on the muscle activities of workers' trunk. Safe operation standards should therefore be taken to protect the exposed workers and to improve the industrial design of irrigation cutters to prevent the occurrence of occupational diseases. Med Pr. 2022;73(3):201-7

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“…The findings of Hutabarat [6], Andriani et al [7], Szczygieł et al [8], and Zein et al [9] proved that work activity in sitting conditions has a high level of musculosceletal disorders due to muscle tension. It is mentioned that the need for interlude activities such as rest by standing to straighten the condition of the back [10]. There was an intervention by designing a chair design to reduce muscle complaints [2,9].…”

Section: Figure 1 Complaint Rate Of Musculoskeletal Disorders (Msds) ...mentioning

confidence: 99%

Ergonomic Chair Design as a Solution to Musculoskeletal Disorders among Traditional Cobblers: An Anthropometric Study

Hutabarat,

Pradana,

Ruwana

et al. 2023

JESA

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This study was undertaken with the aim of engineering an ergonomic chair tailored specifically for cobblers in the Malang Regency, taking into account anthropometric measurements, the Nordic body map, and the Rapid Upper Limb Assessment method. Musculoskeletal disorders, often resulting from prolonged sitting and incorrect posture, represent significant occupational hazards for them. To mitigate these health risks, the study employed the analysis of Nordic body maps to quantify complaints based on body points, and determined anthropometric dimensions to guide the design of ergonomically correct chairs. The aspiration is that the findings of this study will diminish the prevalence of musculoskeletal disorders, while enhancing the productivity and work quality of cobblers. Cobblers are particularly susceptible to musculoskeletal disorders in the waist and left calf areas, along with the back, hips, right thigh, right calf, left foot, and right foot. Insights gleaned from the Nordic body maps analysis and Rapid Upper Limb Assessment method demonstrated the need for modifications to the traditional cobbler chair to reduce these risks. Consequently, an innovative ergonomic chair was designed, incorporating anthropometric dimensions and several distinctive features, including an adjustable tilt angle on the backrest, a height-adjustable seat base, and a seat base that conforms to the load conditions of the buttocks and thighs.

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Ergonomic evaluation of the effects of forearm conditions and body postures on trapezius muscle activity during smartphone texting

Cited by 19 publications

References 43 publications

Field Study of Postural Characteristics of Standing and Seated Smartphone Use

Field Study of Postural Characteristics of Standing and Seated Smartphone Use

Muscle fatigue related to human posture using a brush cutter for landscape gardening: a preliminary study

Ergonomic Chair Design as a Solution to Musculoskeletal Disorders among Traditional Cobblers: An Anthropometric Study

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