Maximum acceptable weights for asymmetric lifting of Chinese females

Wu, Swei-Pi

doi:10.1016/s0003-6870(03)00010-3

Cited by 24 publications

(32 citation statements)

References 22 publications

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“…The nonsignificant interaction effect of frequency and container on MAWL simplifies the data explanation. 7,8) studies, while was higher than the 7% decrement reported in Mital and Fard 9) study. The reason for the decrement with lifting frequency may be primarily due to increased handling of the body weight 10) .…”

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confidence: 50%

Psychophysically Determined Asymmetrical Lifting Capabilities for Different Frequencies and Containers

Lee

2005

Ind Health

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Back injuries to the lifters caused by lifting remain a common occurrence not only in developed countries, but also in developing and undeveloped countries. Asymmetric lifting task, combining lifting, bending and twisting motions of the torso, is more harmful to back spine than symmetric lifting task. Snook and Irvin 1) first developed the psychophysical approach to determine human maximum acceptable weight of lifting (MAWL) for preventing lifters from sustaining back injuries, and this approach has been adopted in various lifting conditions. Ciriello et al.2) indicated that the psychophysically determined MAWL data could be applied to a general work day for task frequencies of 4.3 lifts/min or lower.Very few papers reported the container effects on psychophysically determined MAWL, especially for asymmetric lifting. This study examined the effects of lifting frequency and container on psychophysically determined 4-h MAWL for 90-degree asymmetric lifting tasks from floor to knuckle height (approximately 74 cm). Additionally, this study compared the MAWL data with the recommended weight limits derived from the revised NIOSH lifting equation 3) . It is hoped that these MAWL data can help designing asymmetric lifting jobs for reducing the severity and frequency of overexertion injuries and improving productivity.Ten young healthy and lift-experienced males gave their written consent form for this experiment. Their mean (SD) age was 20.0 (0.5) yr, weight was 62.7 (8.0) kg, and height was 170.0 (4.3) cm.A two-factor factorial design was used to examine the effects of lifting frequency and container on participants' MAWL capability in asymmetrical lifting tasks. Three lifting frequencies, 1 lift/min, 2 lifts/min and 4 lifts/min, and three containers (length*width*height), 70 × 35 × 15 cm, 50 × 50 × 15 cm and 50 × 35 × 15 cm were selected. The three containers were designed for examining the effects of

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confidence: 50%

Psychophysically Determined Asymmetrical Lifting Capabilities for Different Frequencies and Containers

Lee

2005

Ind Health

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“…In this low lifting frequency (1 lift min À1 ) condition, the biomechanical restriction is more dominant than physiological limitation. Recently, Wu (2003) studied on Chinese female college students and reported that MAWL for Chinese females for 1 h lifting from floor to the knuckle height level obtained as 24.80 kg with an overall average RPE (Rating of Perceived Exertion) response was ''somewhat hard''. In India, existing Maharashtra Factory Rule suggested that 30 kg load should be the acceptable load limit for Indian Female workers (Dwivedi, 2000), which is just double of this estimated MAWL value.…”

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confidence: 99%

Determination of maximum acceptable weight of lift by adult Indian female workers

Maiti

Ray

2004

International Journal of Industrial Ergonomics

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“…Furthermore, the study by Morshedi et al showed that by increasing the trunk forward bending to lift loads from the bottom floors, the compressive force exerted on L5/S1 significantly increased compared to that of the upper floors (22). The results of the study by Wu on Chinese females indicated that increasing the trunk angle reduced maximum acceptable weight of lift (MAWL) (23). Several studies suggested that the impact of awkward postures was greater than that of the external load weight in increasing the compressive force (24,25).…”

Section: Discussionmentioning

confidence: 99%

The Adequacy of NIOSH Equation to to Determine the Rate of Stresses Exerted on the Back Based on Compressive Force Estimation

Afshari

Kord

Latifi

et al. 2016

Jundishapur J Health Sci

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Background: Manual handling may cause workers to deal with various risk factors. Workers performing such tasks repeatedly for a long time are more prone to bodily injuries and physical problems such as back pain. Objectives: The current study aimed to assess the compressive loads estimation and analysis of forces exerted on the workers' back in manual load lifting tasks using the national institute for occupational safety and health (NIOSH) equation and compare them with the recommended weight limit (RWL). Methods: It was a cross-sectional study in a laboratory setting on 15 healthy male workers in 2015. The participants were required to randomly perform 25 tasks with four iterations. The lifting index (LI) was calculated by NIOSH equation in simple tasks and compressive loads on the low back (L4/L5) for each task were calculated using the 3DSSPP. Data were analyzed using SPSS version 16. Results:The results showed that the highest compressive force exerted on the back was equal to 4002 N and the lowest force 1425 N. Moreover, 76% of the tasks were reported to have the highest compressive force greater than the recommended limit; 72% of the tasks had an LI 1 -3 and 28% of them had an LI less than 1. There was a weak direct correlation between compressive force and RWL. Conclusions: The NIOSH equation and compressive force estimation function were partially similar to identify high-risk tasks, however, by the compressive force estimation, biomechanical analysis of tasks can be done better since it is quantitative and can determine the exact amount of forces exerted on the back.

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Maximum acceptable weights for asymmetric lifting of Chinese females

Cited by 24 publications

References 22 publications

Psychophysically Determined Asymmetrical Lifting Capabilities for Different Frequencies and Containers

Psychophysically Determined Asymmetrical Lifting Capabilities for Different Frequencies and Containers

Determination of maximum acceptable weight of lift by adult Indian female workers

The Adequacy of NIOSH Equation to to Determine the Rate of Stresses Exerted on the Back Based on Compressive Force Estimation

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