The natural angle between the hand and handle and the effect of handle orientation on wrist radial/ulnar deviation during maximal push exertions

Young, Justin G.; Lin, Jia‐Hua; Chang, Chien-Chi; McGorry, Raymond W.

doi:10.1080/00140139.2013.765602

Cited by 9 publications

(2 citation statements)

References 28 publications

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“…Following a more detailed assessment one study [17] was excluded due to similar content to a second study by the same author [2] and another one because it primarily focused on sex differences [18]. There were studies excluded for not meeting the inclusion criteria (Table 5) [5], [17], [18], [19], [20], [21], [22], [23], [24], [25]. Thirteen studies were retained after reading the whole paper and submitted to assessment of their methodological quality (Table 1).…”

Section: Methodsmentioning

confidence: 99%

Human Body Mechanics of Pushing and Pulling: Analyzing the Factors of Task-related Strain on the Musculoskeletal System

Argubi-Wollesen

Wollesen²,

Leitner³

et al. 2017

Safety and Health at Work

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The purpose of this review is to name and describe the important factors of musculoskeletal strain originating from pushing and pulling tasks such as cart handling that are commonly found in industrial contexts. A literature database search was performed using the research platform Web of Science. For a study to be included in this review differences in measured or calculated strain had to be investigated with regard to: (1) cart weight/ load; (2) handle position and design; (3) exerted forces; (4) handling task (push and pull); or (5) task experience. Thirteen studies met the inclusion criteria and proved to be of adequate methodological quality by the standards of the Alberta Heritage Foundation for Medical Research. External load or cart weight proved to be the most influential factor of strain. The ideal handle positions ranged from hip to shoulder height and were dependent on the strain factor that was focused on as well as the handling task. Furthermore, task experience and subsequently handling technique were also key to reducing strain. Workplace settings that regularly involve pushing and pulling should be checked for potential improvements with regards to lower weight of the loaded handling device, handle design, and good practice guidelines to further reduce musculoskeletal disease prevalence.

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Section: Methodsmentioning

confidence: 99%

Human Body Mechanics of Pushing and Pulling: Analyzing the Factors of Task-related Strain on the Musculoskeletal System

Argubi-Wollesen

Wollesen²,

Leitner³

et al. 2017

Safety and Health at Work

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show abstract

“…EMGs of the upper and lower limbs were recorded during the STS movement. Several studies have investigated the effects of handle orientation on the pull and push forces (Young, et al, 2009;Seo, et al, 2010;Lin, et al, 2012;Ehrlich, et al, 2013;Young, et al, 2013). They suggested that the maximum pull and push forces occur when the forearm is in line with the forces and the wrist is in the neutral posture.…”

Section: Introductionmentioning

confidence: 99%

Optimum position and orientation of handrail for sit-to-stand movement

Chihara

Fukuchi

Seo

2015

JAMDSM

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The sit-to-stand (STS) movement is performed throughout the day, and providing handrails is one method of making the STS movement easy. However, designers may have determined the installation position of handrails using intuition and trial and error. The aim of this study is to determine the optimum position and orientation of handrails by minimizing the quantified physical load of the STS movement. Twelve university students participated, and eight electromyograms (EMGs), namely, of the brachioradialis, flexor carpi ulnaris, extensor carpi radialis longus, latissimus dorsi, right and left rectus femoris, and right and left tibialis anterior, were recorded. Observations with handrails at various tilt angles and forward distances from the edge of the seat were analyzed for the optimization. The total physical load (TPL) function was formulated as the weighted sum of the EMGs. The weight coefficients were determined by maximizing the correlation coefficient between the measured subjective scores and the TPL function values. The result shows that the handrail installation position significantly affects all of the EMGs except those of the right and left rectus femoris. The weight coefficients of the TPL function are positive for the upper limb muscles, whereas they are zero for the lower limb muscles. The handrail position for multiple users was formulated to minimize the TPL function, and hence the optimum position was determined.

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