| 1. |
- Batistao, Mariana Vieira, et al.
(författare)
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Furniture dimensions and postural overload for schoolchildren's head, upper back and upper limbs
- 2012
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Ingår i: Work: A Journal of Prevention, Assessment & Rehabilitation. - 1875-9270. ; 41, s. 4817-4824
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to evaluate how the fixed furniture dimensions match with students' anthropometry and to describe head, upper back and upper limbs postures and movements. Evaluation was performed in 48 students from a Brazilian state school. Furniture dimensions were measured with metric tape, movements and postures by inclinometers (Logger Tecknologi, Akarp, Sweden). Seat height was high for 21% and low for 36% of the students; seat length was short for 45% and long for 9% and table height was high for 53% and low for 28%. Regression analysis showed that seat/popliteal height quotient is explained by 90th percentile of upper back inclination (beta=0.410) and 90th percentile of right upper arm elevation (beta=-0.293). For seat/thigh length quotient the significant variables were 90th percentile of upper back velocity (beta=-0.282) and 90th percentile of right upper arm elevation (beta=0.410). This study showed a relationship between furniture mismatch and postural overload. When the seat height is low students increase upper back left inclination and right upper arm elevation; when the seat is short students decrease the upper back flexion velocity and increase right upper arm elevation.
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| 2. |
- Moriguchi, Cristiane Shinohara, et al.
(författare)
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Occupational posture exposure among construction electricians
- 2013
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Ingår i: Applied Ergonomics. - : Elsevier BV. - 1872-9126 .- 0003-6870. ; 44:1, s. 86-92
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study is to record, objectively describe and compare working postures of Brazilian and Norwegian construction electricians. Postures of the upper arms, head, and neck during work and breaks were quantified by means of inclinometry for a representative sample of 12 Brazilian and 12 Norwegian electricians in the construction industry during a full work-shift. Despite that differences were found between specific work-related factors, Brazilian and Norwegian workers revealed a high and very similar level and pattern of postures for all evaluated body regions, suggesting that results could be extrapolated to other electricians. Upper arm elevation was high and similar for both groups and head flexion and extension was pronounced compared to other occupations. Thus, extreme postures were identified for construction electricians in both countries, with similar exposure pattern also for defined tasks (planning, support and wiredraw), suggesting that this job is risky regardless organizational differences. (C) 2012 Elsevier Ltd and The Ergonomics Society. All rights reserved.
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| 3. |
- Moriguchi, Cristiane Shinohara, et al.
(författare)
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Postures and Movements in the Most Common Tasks of Power Line Workers
- 2011
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Ingår i: Industrial Health. - 1880-8026. ; 49:4, s. 482-491
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Tidskriftsartikel (refereegranskat)abstract
- The repair and maintenance of electrical power lines involves awkward postures, which are known risk factors for developing musculoskeletal disorders. The aim of the present study was to quantify postures and movements of upper arm, head, upper back and neck in the main tasks performed by line workers. Posture of twelve right-handed line workers was recorded by inclinometry and presented as percentiles of angular and angular velocity distributions. All tasks involved considerable upper-arm elevation, ranging from 73 degrees to 115 degrees for the 90th percentile. Upper-arm elevation showed significant differences between tasks, but no consistent differences between right and left sides. Regarding velocity, the right arm presented higher levels than the left arm. All tasks required significant extension of head, upper back and neck, ranging from 7 degrees to 67 degrees for head (10th percentile). All tasks, except the one performed with a continuous extension, also involved pronounced flexion, ranging from 33 degrees to 60 degrees for the head (90th percentile). Work which required highly elevated arms also required significant head extension (r(2)=0.56). Awkward postures of upper arms, head, upper back and neck were identified by inclinometry, demonstrating the need for preventative interventions to reduce musculoskeletal disorders among line workers.
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| 4. |
- Sato, Tatiana de Oliveira, et al.
(författare)
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Goniometer Crosstalk Compensation for Knee Joint Applications
- 2010
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Ingår i: Sensors. - : MDPI AG. - 1424-8220. ; 10:11, s. 9994-10005
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Tidskriftsartikel (refereegranskat)abstract
- Electrogoniometers are prone to crosstalk errors related to endblocks rotation (general crosstalk) and to the characteristics of each sensor (individual crosstalk). The aim of this study was to assess the crosstalk errors due to endblock misalignments and to propose a procedure to compensate for these errors in knee applications. A precision jig was used to simulate pure +/- 100 degrees flexion/extension movements. A goniometer was mounted with various degrees of valgus/varus (+/- 20 degrees) and rotation (+/- 30 degrees) misalignments. For valgus/varus misalignments, although offset compensation eliminated the error in the valgus/varus recordings for 0 degrees of flexion/extension and reduced it to a few degrees for small (+/- 30 degrees) flexion/extension angles (root mean square error = 1.1 degrees), the individual crosstalk caused pronounced errors for large (+/- 100 degrees) angles (18.8 degrees). Subsequent compensation for this crosstalk reduced these errors to 0.8 degrees and 4.5 degrees, respectively. For rotational misalignment, compensation for the general crosstalk by means of coordinate system rotation, in combination with compensation for the individual crosstalk, reduced the errors for small (+/- 30 degrees) and large (+/- 100 degrees) flexion/extension angles from 3.6 degrees to 0.5 degrees and from 15.5 degrees to 2.4 degrees, respectively. Crosstalk errors were efficiently compensated by the procedures applied, which might be useful in preprocessing of knee functional data, thereby substantially improving goniometer accuracy.
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| 5. |
- Sato, Tatiana de Oliveira, et al.
(författare)
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Improving goniometer accuracy by compensating for individual transducer characteristics
- 2009
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Ingår i: Journal of Electromyography & Kinesiology. - : Elsevier BV. - 1873-5711 .- 1050-6411. ; 19:4, s. 704-709
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Tidskriftsartikel (refereegranskat)abstract
- Flexible goniometers are useful for direct movement measurements. Crosstalk due to rotation between the endblocks is well known. However, even without any rotation, some crosstalk can occur. The objective of this study was to elucidate the effect of, and compensate for, the inherent crosstalk in biaxial goniometers, with specific relevance for applications with one dominating movement direction. Six biaxial goniometers (M110, Biometrics Ltd., Gwent, UK) were evaluated. A precision jig, for simulating pure flexion/extension angles, was constructed. Each sensor produced a consistent and specific crosstalk pattern, when tested over a +/-100 degrees range of motion. A procedure for correction for the inherent crosstalk of individual goniometer, based on polynomial adjust, is presented. The method for compensation, which reduced the root mean square error from, on average for the six goniometers, 3.7 degrees (range 1.8-10.1 degrees) to 0.35 degrees (0.12-0.55 degrees), might be required for obtaining valid goniometer measurements, e.g. of valgus/varus of the knee during gait flexion/extension movements. (C) 2008 Elsevier Ltd. All rights reserved.
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