Quantification of lower extremity physical exposures
in various combinations of sit/stand time duration
associated with sit-stand workstation

Pei, Huining; Yu, Shuhui; Babski-Reeves, Kari; Chu, Jianjie; Qu, Min; Tian, Baozhen; Li, Wenhua

doi:10.13075/mp.5893.00613

Cited by 3 publications

(2 citation statements)

References 43 publications

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“…Hagberg et al [35,36] believed that it was insufficient to merely apply the surface EMG technique to measure shoulder muscle load. The previous research focused on MSD evolution or ergonomic interventions has emphasized the interactions between the objective and subjective fatigue in connection with occupational activities [1,37,38]. In addition, the posture fatigue is influenced by subjective and objective methods.…”

Section: Perceived Level Of Discomfortmentioning

confidence: 99%

Shoulder girdle muscle activity and fatigue during automobile chassis repair

Tian¹,

Yu²,

Chu³

et al. 2019

Int J Occup Med Environ Health

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Objectives: The objective of this study was to assess the postures that were commonly used in automobile chassis repair operations, and to evaluate shoulder girdle muscle fatigue for different combinations of the weight of hand-tools. Material and Methods: Two right muscles, including upper trapezius (UT) and middle deltoid (MD), were selected. Surface electromyography (SEMG) and a perceived level of discomfort (PLD) were used to assess the degree of shoulder girdle fatigue. Fifteen healthy young male subjects from the Northwestern Polytechnical University participated in the test. The test consisted of assuming 4 different postures and maintaining each of them for 60 s. The 4 postures varied in terms of dumbbell weights, standing for the hand-tools weight: W1 was 0.48 kg and W2 was 0.75 kg; the 4 shoulder postures were shoulder flexions of 150°, 120°, 90°, and 60°, combined with an included elbow angle of 180°, 150°, 120° and 90°, respectively. The experimental sequences were randomly selected. The signals of SEMG and the values of PLD in the shoulder girdle were recorded in 60 s. All subjects completed the whole test. The repeated measure analysis of variance (ANOVA) was performed to ascertain differences between dumbbell weight (0.48 kg and 0.75 kg) and shoulder postures (150°/180°, 120°/150°, 90°/120° and 60°/90°). The Friedman test was utilized to determine the significant differences for UT(PLD) and MD(PLD) on shoulder postures. Spearman's correlation was used to analyze the relationship between the subjective and objective measurements. Results: Significant correlational relationships existed between the UT percentage of the maximal voluntary electrical activation (%MVE) and UT(PLD) (r = 0.459, p < 0.01), between MD(%MVE) and MD(PLD) (r = 0.821, p < 0.01). The results showed that SEMG and PLD of the 4 postures under analysis differed significantly (p < 0.05). Conclusions: It was indicated that posture T4 (shoulder forward flexion 60° and included elbow angle 90°) resulted in the lowest fatigue, both in terms of the objective measure and the subjective perception, which meant that this posture was more ergonomic. Int J Occup Med Environ Health. 2019;32(4):537 -52

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Section: Perceived Level Of Discomfortmentioning

confidence: 99%

Shoulder girdle muscle activity and fatigue during automobile chassis repair

Tian¹,

Yu²,

Chu³

et al. 2019

Int J Occup Med Environ Health

Self Cite

View full text Add to dashboard Cite

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“…In the studies conducted, the said problem related to the use of computers in the offices was related to the posterior segments, upper extremity, and neck (6,7). According to a study conducted in Canada, three of every five office workers are dependent on computers while doing their jobs, and the annual rate of musculoskeletal discomforts is essentially affected by the abovementioned risk factors.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the change of lockdowns applied due to COVID-19 pandemic on musculoskeletal discomfort

Şengül

Bulut²,

Adalan³

2020

HumanSciences

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Objectives: COVID-19 pandemic has affected public health to a large extent. The rapid contamination of the disease has necessitated social distance and lockdown. Musculoskeletal discomforts are the most common complaints among routine medical complaints. Restraints caused by the pandemic and psycho-social effects have caused such complaints increase. In the present study, the aim is to determine whether there is a difference between the Musculoskeletal System Discomforts of the people before and during the COVID-19 pandemic and to reveal the factors affecting such a difference. Material and Method: This study was carried out in descriptive design. In the study, the study group consisted 1138 people living at different cities of Turkey who accepted to participate in the study. As the data collection tool, the personal information form prepared by the researcher and the “Cornell Musculoskeletal Discomfort Questionnaire (T-CMDQ)”, which was developed by Cornell and translated into Turkish by Erdinç et al. who also tested the validity and adaptation of the questionnaire, were used in the study. The test method conducted in computer environment was used as the data collection method. In the study, decision of the ethics committee was taken for the non-interventional practices (Dated 2020 with no. 06). Paired Sample t-Test statistics was used for data comparison in the study. Significance level was accepted as p <0.001. In the study, Cronbach alpha value of the total score of Musculoskeletal Discomfort Questionnaire was found as 0.92. Results: It was determined that there was a statistically significant difference between the total mean scores of the participants before COVID-19 and during COVID-19 (p <0.001). There was a statistically significant difference between the total mean scores of the participants regarding the pain level before COVID-19 and during COVID-19 (p <0.001). Conclusion: During COVID-19, it is determined that there is a decrease in the frequency of feeling pain, aches, and discomfort in body regions, but an increase in the severity of the emergent discomforts.

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Effects of Time in Sitting and Standing on Pleasantness, Acceptability, Fatigue, and Pain When Using a Sit–Stand Desk: An Experiment on Overweight and Normal-Weight Subjects

Barbieri¹,

Brusaca²,

Mathiassen³

et al. 2020

Journal of Physical Activity and Health

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Background: Sit–stand desks have been suggested as an initiative to increase posture variation among office workers. However, there is limited evidence of what would be preferable combinations of time sitting and standing. The aim of this study was to determine and compare perceived pleasantness, acceptability, pain, and fatigue for 5 time patterns of sitting and standing at a sit–stand desk. Methods: Thirty postgraduate students were equally divided into a normal-weight (mean body mass index 22.8 kg/m2) and an overweight/obese (mean body mass index 28.1 kg/m2) group. They performed 3 hours of computer work at a sit–stand desk on 5 different days, each day with a different time pattern (A: 60-min sit/0-min stand; B: 50/10; C: 40/20; D: 30/30; E: 20/40). Pleasantness, acceptability, pain, and fatigue ratings were obtained at the beginning and at the end of the 3-hour period. Results: High ratings of pleasantness were observed for time patterns B, C, and D in both groups. All participants rated acceptability to be good for time patterns A to D. A minor increase in perceived fatigue and pain was observed in time pattern E. Conclusion: For new sit–stand desk users, regardless of body mass index, 10 to 30 minutes of standing per hour appears to be an amenable time pattern.

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Quantification of lower extremity physical exposures in various combinations of sit/stand time duration associated with sit-stand workstation

Cited by 3 publications

References 43 publications

Shoulder girdle muscle activity and fatigue during automobile chassis repair

Shoulder girdle muscle activity and fatigue during automobile chassis repair

Investigation of the change of lockdowns applied due to COVID-19 pandemic on musculoskeletal discomfort

Effects of Time in Sitting and Standing on Pleasantness, Acceptability, Fatigue, and Pain When Using a Sit–Stand Desk: An Experiment on Overweight and Normal-Weight Subjects

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