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Ana Beatriz Oliveira - One of the best experts on this subject based on the ideXlab platform.
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Variation in upper trapezius and wrist extensor EMG among office workers during sit-Stand table use in a real work setting
2019Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Ana Beatriz OliveiraAbstract:Background: Computer work is generally associated with constrained postures and low muscular demands. Sit-Stand Tables have been suggested as an effective initiative to change working postures duri ...
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Variation in upper extremity, neck and trunk postures when performing computer work at a sit-Stand station
Applied ergonomics, 2018Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Ana Beatriz OliveiraAbstract:Sit-Stand Tables are introduced in offices to increase variation in gross body posture, but the extent to which upper body posture variation is also affected has not previously been addressed. Neck, trunk, and upper arm postures (means and minute-to-minute variances) were determined during periods of sitting and Standing from 24 office workers using sit-Stand Tables to perform computer work. Posture variability resulting from different temporal compositions of sitting and Standing computer work was then predicted for the neck, trunk and upper arm by simulations. Postural variability during computer work could be increased up to three-fold when 20-60% of the work was performed Standing (i.e. 40-80% performed sitting), compared to performing computer work only sitting. The exact composition of sit-Stand proportions leading to maximum variability, as well as the potential size of the increase in variability, differed considerably between workers. Guidelines for sit-Stand table use should note these large inter-individual differences.
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Comparison of Sedentary Behaviors in Office Workers Using Sit-Stand Tables with and Without Semiautomated Position Changes
Human factors, 2017Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Ana Beatriz OliveiraAbstract:Objective:We compared usage patterns of two different electronically controlled sit-Stand Tables during a 2-month intervention period among office workers.Background:Office workers spend most of their working time sitting, which is likely detrimental to health. Although the introduction of sit-Stand Tables has been suggested as an effective intervention to decrease sitting time, limited evidence is available on usage patterns of sit-Stand Tables and whether patterns are influenced by table configuration.Method:Twelve workers were provided with Standard sit-Stand Tables (nonautomated table group) and 12 with semiautomated sit-Stand Tables programmed to change table position according to a preset pattern, if the user agreed to the system-generated prompt (semiautomated table group). Table position was monitored continuously for 2 months after introducing the Tables, as a proxy for sit-Stand behavior.Results:On average, the table was in a “sit” position for 85% of the workday in both groups; this percentage ...
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sit Stand Tables with semi automated position changes a new interactive approach for reducing sitting in office work
IISE Transactions on Occupational Ergonomics and Human Factors, 2017Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Roberto S. Inoue, Adriano A. G. Siqueira, Helen Cristina Nogueira, Wilian Dos M Santos, Ana Beatriz OliveiraAbstract:Background: Introduction of sit-Stand Tables has been proposed as an initiative to decrease sedentary behavior among office workers and thus reduce risks of negative cardiometabolic health effects. ...
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Sit–Stand Tables With Semi-Automated Position Changes: A New Interactive Approach for Reducing Sitting in Office Work
IISE Transactions on Occupational Ergonomics and Human Factors, 2017Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Wilian M. Dos Santos, Roberto S. Inoue, Adriano A. G. Siqueira, Helen Cristina Nogueira, Ana Beatriz OliveiraAbstract:Background: Introduction of sit-Stand Tables has been proposed as an initiative to decrease sedentary behavior among office workers and thus reduce risks of negative cardiometabolic health effects. ...
Dechristian França Barbieri - One of the best experts on this subject based on the ideXlab platform.
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Variation in upper trapezius and wrist extensor EMG among office workers during sit-Stand table use in a real work setting
2019Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Ana Beatriz OliveiraAbstract:Background: Computer work is generally associated with constrained postures and low muscular demands. Sit-Stand Tables have been suggested as an effective initiative to change working postures duri ...
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Variation in upper extremity, neck and trunk postures when performing computer work at a sit-Stand station
Applied ergonomics, 2018Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Ana Beatriz OliveiraAbstract:Sit-Stand Tables are introduced in offices to increase variation in gross body posture, but the extent to which upper body posture variation is also affected has not previously been addressed. Neck, trunk, and upper arm postures (means and minute-to-minute variances) were determined during periods of sitting and Standing from 24 office workers using sit-Stand Tables to perform computer work. Posture variability resulting from different temporal compositions of sitting and Standing computer work was then predicted for the neck, trunk and upper arm by simulations. Postural variability during computer work could be increased up to three-fold when 20-60% of the work was performed Standing (i.e. 40-80% performed sitting), compared to performing computer work only sitting. The exact composition of sit-Stand proportions leading to maximum variability, as well as the potential size of the increase in variability, differed considerably between workers. Guidelines for sit-Stand table use should note these large inter-individual differences.
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Comparison of Sedentary Behaviors in Office Workers Using Sit-Stand Tables with and Without Semiautomated Position Changes
Human factors, 2017Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Ana Beatriz OliveiraAbstract:Objective:We compared usage patterns of two different electronically controlled sit-Stand Tables during a 2-month intervention period among office workers.Background:Office workers spend most of their working time sitting, which is likely detrimental to health. Although the introduction of sit-Stand Tables has been suggested as an effective intervention to decrease sitting time, limited evidence is available on usage patterns of sit-Stand Tables and whether patterns are influenced by table configuration.Method:Twelve workers were provided with Standard sit-Stand Tables (nonautomated table group) and 12 with semiautomated sit-Stand Tables programmed to change table position according to a preset pattern, if the user agreed to the system-generated prompt (semiautomated table group). Table position was monitored continuously for 2 months after introducing the Tables, as a proxy for sit-Stand behavior.Results:On average, the table was in a “sit” position for 85% of the workday in both groups; this percentage ...
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sit Stand Tables with semi automated position changes a new interactive approach for reducing sitting in office work
IISE Transactions on Occupational Ergonomics and Human Factors, 2017Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Roberto S. Inoue, Adriano A. G. Siqueira, Helen Cristina Nogueira, Wilian Dos M Santos, Ana Beatriz OliveiraAbstract:Background: Introduction of sit-Stand Tables has been proposed as an initiative to decrease sedentary behavior among office workers and thus reduce risks of negative cardiometabolic health effects. ...
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Sit–Stand Tables With Semi-Automated Position Changes: A New Interactive Approach for Reducing Sitting in Office Work
IISE Transactions on Occupational Ergonomics and Human Factors, 2017Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Wilian M. Dos Santos, Roberto S. Inoue, Adriano A. G. Siqueira, Helen Cristina Nogueira, Ana Beatriz OliveiraAbstract:Background: Introduction of sit-Stand Tables has been proposed as an initiative to decrease sedentary behavior among office workers and thus reduce risks of negative cardiometabolic health effects. ...
Divya Srinivasan - One of the best experts on this subject based on the ideXlab platform.
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Variation in upper trapezius and wrist extensor EMG among office workers during sit-Stand table use in a real work setting
2019Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Ana Beatriz OliveiraAbstract:Background: Computer work is generally associated with constrained postures and low muscular demands. Sit-Stand Tables have been suggested as an effective initiative to change working postures duri ...
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Variation in upper extremity, neck and trunk postures when performing computer work at a sit-Stand station
Applied ergonomics, 2018Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Ana Beatriz OliveiraAbstract:Sit-Stand Tables are introduced in offices to increase variation in gross body posture, but the extent to which upper body posture variation is also affected has not previously been addressed. Neck, trunk, and upper arm postures (means and minute-to-minute variances) were determined during periods of sitting and Standing from 24 office workers using sit-Stand Tables to perform computer work. Posture variability resulting from different temporal compositions of sitting and Standing computer work was then predicted for the neck, trunk and upper arm by simulations. Postural variability during computer work could be increased up to three-fold when 20-60% of the work was performed Standing (i.e. 40-80% performed sitting), compared to performing computer work only sitting. The exact composition of sit-Stand proportions leading to maximum variability, as well as the potential size of the increase in variability, differed considerably between workers. Guidelines for sit-Stand table use should note these large inter-individual differences.
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Comparison of Sedentary Behaviors in Office Workers Using Sit-Stand Tables with and Without Semiautomated Position Changes
Human factors, 2017Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Ana Beatriz OliveiraAbstract:Objective:We compared usage patterns of two different electronically controlled sit-Stand Tables during a 2-month intervention period among office workers.Background:Office workers spend most of their working time sitting, which is likely detrimental to health. Although the introduction of sit-Stand Tables has been suggested as an effective intervention to decrease sitting time, limited evidence is available on usage patterns of sit-Stand Tables and whether patterns are influenced by table configuration.Method:Twelve workers were provided with Standard sit-Stand Tables (nonautomated table group) and 12 with semiautomated sit-Stand Tables programmed to change table position according to a preset pattern, if the user agreed to the system-generated prompt (semiautomated table group). Table position was monitored continuously for 2 months after introducing the Tables, as a proxy for sit-Stand behavior.Results:On average, the table was in a “sit” position for 85% of the workday in both groups; this percentage ...
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sit Stand Tables with semi automated position changes a new interactive approach for reducing sitting in office work
IISE Transactions on Occupational Ergonomics and Human Factors, 2017Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Roberto S. Inoue, Adriano A. G. Siqueira, Helen Cristina Nogueira, Wilian Dos M Santos, Ana Beatriz OliveiraAbstract:Background: Introduction of sit-Stand Tables has been proposed as an initiative to decrease sedentary behavior among office workers and thus reduce risks of negative cardiometabolic health effects. ...
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Sit–Stand Tables With Semi-Automated Position Changes: A New Interactive Approach for Reducing Sitting in Office Work
IISE Transactions on Occupational Ergonomics and Human Factors, 2017Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Wilian M. Dos Santos, Roberto S. Inoue, Adriano A. G. Siqueira, Helen Cristina Nogueira, Ana Beatriz OliveiraAbstract:Background: Introduction of sit-Stand Tables has been proposed as an initiative to decrease sedentary behavior among office workers and thus reduce risks of negative cardiometabolic health effects. ...
Svend Erik Mathiassen - One of the best experts on this subject based on the ideXlab platform.
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Variation in upper trapezius and wrist extensor EMG among office workers during sit-Stand table use in a real work setting
2019Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Ana Beatriz OliveiraAbstract:Background: Computer work is generally associated with constrained postures and low muscular demands. Sit-Stand Tables have been suggested as an effective initiative to change working postures duri ...
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Variation in upper extremity, neck and trunk postures when performing computer work at a sit-Stand station
Applied ergonomics, 2018Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Ana Beatriz OliveiraAbstract:Sit-Stand Tables are introduced in offices to increase variation in gross body posture, but the extent to which upper body posture variation is also affected has not previously been addressed. Neck, trunk, and upper arm postures (means and minute-to-minute variances) were determined during periods of sitting and Standing from 24 office workers using sit-Stand Tables to perform computer work. Posture variability resulting from different temporal compositions of sitting and Standing computer work was then predicted for the neck, trunk and upper arm by simulations. Postural variability during computer work could be increased up to three-fold when 20-60% of the work was performed Standing (i.e. 40-80% performed sitting), compared to performing computer work only sitting. The exact composition of sit-Stand proportions leading to maximum variability, as well as the potential size of the increase in variability, differed considerably between workers. Guidelines for sit-Stand table use should note these large inter-individual differences.
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Comparison of Sedentary Behaviors in Office Workers Using Sit-Stand Tables with and Without Semiautomated Position Changes
Human factors, 2017Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Ana Beatriz OliveiraAbstract:Objective:We compared usage patterns of two different electronically controlled sit-Stand Tables during a 2-month intervention period among office workers.Background:Office workers spend most of their working time sitting, which is likely detrimental to health. Although the introduction of sit-Stand Tables has been suggested as an effective intervention to decrease sitting time, limited evidence is available on usage patterns of sit-Stand Tables and whether patterns are influenced by table configuration.Method:Twelve workers were provided with Standard sit-Stand Tables (nonautomated table group) and 12 with semiautomated sit-Stand Tables programmed to change table position according to a preset pattern, if the user agreed to the system-generated prompt (semiautomated table group). Table position was monitored continuously for 2 months after introducing the Tables, as a proxy for sit-Stand behavior.Results:On average, the table was in a “sit” position for 85% of the workday in both groups; this percentage ...
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sit Stand Tables with semi automated position changes a new interactive approach for reducing sitting in office work
IISE Transactions on Occupational Ergonomics and Human Factors, 2017Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Roberto S. Inoue, Adriano A. G. Siqueira, Helen Cristina Nogueira, Wilian Dos M Santos, Ana Beatriz OliveiraAbstract:Background: Introduction of sit-Stand Tables has been proposed as an initiative to decrease sedentary behavior among office workers and thus reduce risks of negative cardiometabolic health effects. ...
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Sit–Stand Tables With Semi-Automated Position Changes: A New Interactive Approach for Reducing Sitting in Office Work
IISE Transactions on Occupational Ergonomics and Human Factors, 2017Co-Authors: Dechristian França Barbieri, Divya Srinivasan, Svend Erik Mathiassen, Wilian M. Dos Santos, Roberto S. Inoue, Adriano A. G. Siqueira, Helen Cristina Nogueira, Ana Beatriz OliveiraAbstract:Background: Introduction of sit-Stand Tables has been proposed as an initiative to decrease sedentary behavior among office workers and thus reduce risks of negative cardiometabolic health effects. ...
Hailemariam Temesgen - One of the best experts on this subject based on the ideXlab platform.
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Comparison of stratified and non-stratified most similar neighbour imputation for estimating Stand Tables
Forestry, 2008Co-Authors: Bianca N.i. Eskelson, Hailemariam Temesgen, Tara M. BarrettAbstract:Summary Many growth and yield simulators require a Stand table or tree-list to set the initial condition for projections in time. Most similar neighbour (MSN) approaches can be used for estimating Stand Tables from information commonly available on forest cover maps (e.g. height, volume, per cent canopy cover and species composition). Simulations were used to compare MSN (using an entire database) with two stratifi ed MSN approaches. The fi rst stratifi ed MSN approach used species composition to partition the population into two inventory type strata, while the second stratifi ed MSN approach used average Stand age to partition the data into two Stand development stages (strata). The MSN approach was used within the whole population and within each stratum to select a reference Stand and to impute the ground variables of the reference Stand to each target Stand. Observed vs estimated Stand Tables were then compared for the stratifi ed and non-stratifi ed simulations. The imputation within a stratum did not result in better estimates than using the MSN approach within the whole population. Possible reasons for poor performance of stratifi ed MSN are provided.
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Imputing tree-lists from aerial attributes for complex Stands of south-eastern British Columbia
Forest Ecology and Management, 2003Co-Authors: Hailemariam Temesgen, Valerie Lemay, K.l Froese, Peter L. MarshallAbstract:The nearest neighbor, k-nearest neighbors, distance-weighted k-nearest neighbor, and class-weighted k-nearest neighbor imputation methods were compared for accuracy in estimating tree-lists (list of species and diameter for each tree) from aerial attributes for complex Stands, with up to nine species and a wide range of sizes, in south-eastern British Columbia, Canada. For the four imputation methods, the most similar neighbor distance metric was used, and three neighbors were used for the k-nearest neighbor methods. Ground variables used to represent the tree-list included the number of trees per hectare by species, ranges of diameter by species, and basal area per hectare. Aerial variables included species composition, crown closure (%), elevation, biogeoclimatic ecosystem classification (BEC) zones, height, age, and site class. Sample data were divided, and the imputation methods were compared for accuracy using observed and estimated species composition, Stand Tables, basal area, and volume per hectare. Also, the imputed tree-list was used to predict yield using a Stand level growth model, and this predicted yield was compared to the yield obtained using the actual tree-list. Of the four approaches used, the nearest neighbor was marginally better, but the methods that averaged the three nearest neighbors were somewhat better for the distribution of stems per hectare by diameter for the more sparse hardwood species. Of the three averaging methods, weighting by similarity of the species composition and the BEC zone provided better results. In using the estimated trees lists in a growth and yield model, the average volumes were reasonable at the beginning and end of the period for all methods. However, the volumes for a particular Stand could be quite different than that obtained for an observed tree-list.
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Estimating Stand Tables from Aerial Attributes: a Comparison of Parametric Prediction and Most Similar Neighbour Methods
Scandinavian Journal of Forest Research, 2003Co-Authors: Hailemariam TemesgenAbstract:Parameter prediction and the most similar neighbour (MSN) approaches were compared to estimate Stand Tables from aerial information. The study was based on 50 Stands in the south-eastern interior of British Columbia, Canada. In the parametric prediction approach, Stand Tables were estimated from aerial attributes and three percentile points (16.7, 63 and 97%) of the diameter distribution. In the MSN analysis, Stand Tables were estimated from the MSN Stand that was selected using 13 ground and 22 aerial variables. The accuracy of these approaches was evaluated by comparing the observed and estimated species composition, Stand Tables and volume per hectare. While the parametric prediction approach is easier and flexible to apply, the MSN approach provided reasonable projections, lower bias and lower root mean square error.