Determining the optimal size for posture categories used in video-based posture assessment methods

Wyk, Paula M. van; Weir, Patricia L.; Andrews, David M.; Fiedler, Krysia M.; Callaghan, Jack P.

doi:10.1080/00140130902752118

Cited by 20 publications

(14 citation statements)

References 16 publications

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“…Allowing axial rotation of the manikin appeared to be useful as Table 1 showed that those rotations were much larger than the out of plane motions of the trunk in the present study, and did not negatively affect the accuracy. A last source of errors that we aimed to overcome with the present method is the error made by crude categorization of segment orientations (de Looze et al, 1994;van Wyk et al, 2009), since matching of body orientations can be performed on a continuous scale.…”

Section: Discussionmentioning

confidence: 99%

Estimation of low back moments from video analysis: A validation study

Coenen

Kingma

Boot³

et al. 2011

Journal of Biomechanics

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This study aimed to develop, compare and validate two versions of a video analysis method for assessment of low back moments during occupational lifting tasks since for epidemiological studies and ergonomic practice relatively cheap and easily applicable methods to assess low back loads are needed. Ten healthy subjects participated in a protocol comprising 12 lifting conditions. Low back moments were assessed using two variants of a video analysis method and a lab-based reference method. Repeated measures ANOVAs showed no overall differences in peak moments between the two versions of the video analysis method and the reference method. However, two conditions showed a minor overestimation of one of the video analysis method moments. Standard deviations were considerable suggesting that errors in the video analysis were random. Furthermore, there was a small underestimation of dynamic components and overestimation of the static components of the moments. Intraclass correlations coefficients for peak moments showed high correspondence (>0.85) of the video analyses with the reference method. It is concluded that, when a sufficient number of measurements can be taken, the video analysis method for assessment of low back loads during lifting tasks provides valid estimates of low back moments in ergonomic practice and epidemiological studies for lifts up to a moderate level of asymmetry.

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Section: Discussionmentioning

confidence: 99%

Estimation of low back moments from video analysis: A validation study

Coenen

Kingma

Boot³

et al. 2011

Journal of Biomechanics

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“…It has been proposed that these patients present with maladaptive spinal postures and movement patterns that expose their spines to increased loads and strain (O'Sullivan 2005). In line with this, spinal posture is considered by many in both clinical practice and research to be a factor in the development and maintenance of LBP (van Dillen et al 2003b, Poitras et al 2005, Dankaerts et al 2006a, Womersley and May 2006, van Wyk et al 2009. A number of studies now support the existence of these altered spinal postures in subjects with NSCLBP when examined in a laboratory environment (Burnett et al 2004, Dankaerts et al 2006a,b, 2009, Womersley and May 2006, Smith et al 2008) and modification of posture has been associated with improved clinical outcomes (van Dillen et al 2003a, Dankaerts et al 2007).…”

Section: Introductionmentioning

confidence: 88%

The between-day and inter-rater reliability of a novel wireless system to analyse lumbar spine posture

et al. 2010

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Peter(2011) 'The between-day and inter-rater reliability of a novel wireless system to analyse lumbar spine posture ', Ergonomics, 54: 1,[82][83][84][85][86][87][88][89][90] To link to this Article: DOI: 10.1080/00140139.2010.535020 URL: http://dx.doi.org/10.1080/00140139.2010.535020Full terms and conditions of use: http://www.informaworld.com/terms-and-conditions-of-access.pdf This article may be used for research, teaching and private study purposes. Any substantial or systematic reproduction, re-distribution, re-selling, loan or sub-licensing, systematic supply or distribution in any form to anyone is expressly forbidden.The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with or arising out of the use of this material.The between-day and inter-rater reliability of a novel wireless system to analyse lumbar spine posture Lumbar posture is commonly assessed in non-specific chronic low back pain (NSCLBP), although quantitative measures have mostly been limited to laboratory environments. The BodyGuard TM is a spinal position monitoring device that can monitor posture in real time, both inside and outside the laboratory. The reliability of this wireless device was examined in 18 healthy participants during usual sitting and forward bending, two tasks that are commonly provocative in NSCLBP. Reliability was determined using intraclass correlation coefficients (ICC), the standard error of measurement (SEM), the mean difference and the minimal detectable change (MDC90). Betweenday ICC values ranged from 0.84 to 0.87, with small SEM (5%), mean difference (59%) and MDC90 (514%) values. Inter-rater ICC values ranged from 0.91 to 0.94, with small SEM (4%), mean difference (6%) and MDC90 (9%) values. Between-day and inter-rater reliability are essential requirements for clinical utility and were excellent in this study. Further studies into the validity of this device and its application in clinical trials in occupational settings are required. Statement of Relevance:A novel device that can analyse spinal posture exposure in occupational settings in a minimally invasive manner has been developed. This study established that the device has excellent between-day and inter-rater reliability in healthy pain-free subjects. Further studies in people with low back pain are planned.

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“…For example, Bao and colleagues (2009) reported that 30 intervals provided better agreement among the raters compared to postures coded with 10 intervals. Others have also found that the optimal size of posture categories can range between 15 and 30 , depending on the body segment (van Wyk et al, 2009). In fact, some have reported that observers are able to code dichotomous postures and other gross categories of posture with very high reliability and methodological validity (Kilbom, 1994).…”

Section: Selection Of Postural Variablesmentioning

confidence: 99%

ErgoPART: A Computerized Observational Tool to Quantify Postural Loading in Real-Time During Surgery

Zhu

Yurteri-Kaplan

Cavuoto

et al. 2016

IISE Transactions on Occupational Ergonomics and Human Factors

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OCCUPATIONAL APPLICATIONS Ergonomics postural assessment in realtime (ErgoPART) is a new job analysis tool designed to systematically characterize the postural demands of performing surgery. Tasks, equipment, and procedures that require ergonomic intervention can be identified. ErgoPART can also be used to quantify the benefits of ergonomic interventions that reduce the frequency and duration of non-neutral postures. Preliminary tests, conducted in the context of vaginal surgery, indicate that the tool is easy to learn and may allow broad categories of neck, shoulder, and trunk postures to be coded reliably. ErgoPART is freely available for use. TECHNICAL ABSTRACT Background: Little quantitative information exists regarding the postural demands placed on surgeons in the operating room. One reason for this is the lack of minimally invasive tools available to characterize the duration and frequency of non-neutral postures during surgery. Purpose: The objective of this study was to develop an ergonomics job analysis tool to evaluate, in real-time, the postural requirements of performing surgeries with minimal intrusion to the work, and to complete a preliminary evaluation of the tool. Method: A team of vaginal surgeons first identified the need to systematically observe and characterize body postures during surgery. Ergonomics postural assessment in real-time (ErgoPART) is a computer-based tool that was developed via an iterative design process between these surgeons and ergonomics researchers, and designed to characterize environmental, task, and postural variables during surgical work. A preliminary inter-observer reliability assessment was conducted during one vaginal surgery, involving four observers with varying degrees of ergonomics experience. Results: ErgoPART's data collection interface facilitates recording of basic information about the surgery, task information, surgeon's position with respect to the surgical field, operating room features, and tracking of This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way. broad categories of neck, trunk, and shoulder postures. A unique feature is that the computer interface provides visual feedback about the status of postural codes in the form of a virtual mannequin and dynamic color-coded buttons to reduce coding misclassification during observation. Quantitative information about the frequency and duration of non-neutral body posture categories for the entire surgery, and for specific surgical tasks, is available immediately after the observations are completed via Microsoft Excel TM spreadsheets. Measures of interobserver reliability indicated that the tool may provide a reliable assessment of the duration and frequency of surgeons' non-neutral postur...

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Determining the optimal size for posture categories used in video-based posture assessment methods

Cited by 20 publications

References 16 publications

Estimation of low back moments from video analysis: A validation study

Estimation of low back moments from video analysis: A validation study

The between-day and inter-rater reliability of a novel wireless system to analyse lumbar spine posture

ErgoPART: A Computerized Observational Tool to Quantify Postural Loading in Real-Time During Surgery

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