Psychophysically determined symmetric and asymmetric lifting capacity of Chinese males for one hour's work shifts

Wu, Swei-Pi

doi:10.1016/s0169-8141(99)00055-4

Cited by 24 publications

(24 citation statements)

References 16 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: 51%

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: 51%

Psychophysically Determined Asymmetrical Lifting Capabilities for Different Frequencies and Containers

Lee

2005

Ind Health

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“…When the load mass increased, the psychophysical rating increased as well [9]. Wu stated that there is no significant relationship between twist angle and psychophysical experience [8], [10]. However, other studies pointed that performing manual lifting with asymmetric posture (twist angle) is physically difficult and lead to fatigue as the body twist can cause muscle strain [13], [14].…”

Section: Psychophysical Experiencementioning

confidence: 99%

“…Furthermore, minimal study been conducted to investigate the effects of load mass, lifting height and twist angle on psychophysical experience, muscle activity and heart rate for Malaysian population. Previous studies suggested that physical factors such as load mass, lifting height and twist angle should be critically examined as they can influence the lifting capacity and muscle activity of the workers [8], [9], [10]. The purpose of this study is to investigate the effects of lifting height, twist angle, and load mass on psychophysical experience, muscle activity, and heart rate of female Malaysian.…”

Section: Introductionmentioning

confidence: 99%

Effects of Lifting Height, Twist Angle and Load Mass on Psychophysical Experience, Muscle Activity and Heart Rate during Manual Lifting

Isa

Rawaida

Seri

et al. 2013

AEF

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Abstract. In industry, manual lifting still a prevalent choice even though mechanized and automated equipment are provided. Mismatch between workers' capability and lifting height, twist angle, and load mass in manual lifting can contribute to occupational injuries such as back pain. The purpose of this study is to investigate the effects of lifting height, twist angle, and load mass on psychophysical experience, muscle activity, and heart rate while performing manual lifting activities. Subjective method associated with Likert Scale was applied to assess the psychophysical experience. Meanwhile, surface Electromyography and heart rate monitor were utilized to measure the muscle activity and heart rate respectively. Main findings of this study show that the rating of psychophysical experience, muscle activity, and heart rate increased when the lifting height and load mass increased. This study concluded that the psychophysical experience and muscle activity were affected when the lifting height, twist angle, and load mass were set at maximum level.

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“…For example, an asymmetric lifting would increase the shear and compression loading on the intervertebral discs and the muscle activities of the trunk [1,2,3,4]. Second, an asymmetric lifting would decrease maximum isometric trunk strength [5], isoinertial peak lifting force, velocity and average upward acceleration [6] or human lifting capability [7,8,9,10,11,12]. Third, an asymmetric lifting can cause poor posture stability and asymmetric muscular loads on the spine [5].…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Lifting Capabilities for Different Container Dimensions

Lee

Cheng

2011

International Journal of Occupational Safety and Ergonomics

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Psychophysically determined symmetric and asymmetric lifting capacity of Chinese males for one hour's work shifts

Cited by 24 publications

References 16 publications

Psychophysically Determined Asymmetrical Lifting Capabilities for Different Frequencies and Containers

Psychophysically Determined Asymmetrical Lifting Capabilities for Different Frequencies and Containers

Effects of Lifting Height, Twist Angle and Load Mass on Psychophysical Experience, Muscle Activity and Heart Rate during Manual Lifting

Asymmetric Lifting Capabilities for Different Container Dimensions

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