Hand-Handhold Coupling: Effect of Handle Shape, Orientation, and Friction on Breakaway Strength

Young, Justin G.; Woolley, Charles; Armstrong, Thomas J.; Ashton‐Miller, James A.

doi:10.1177/0018720809355969

Cited by 38 publications

(52 citation statements)

References 36 publications

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“…Thus, quantification and understanding of a person's maximum hand force to hold onto a rail or ladder rung (i.e., breakaway strength) are needed to develop measures to prevent ladder fall injuries. Previous studies on power grip strength do not predict breakaway strength, because power grip strength addresses only the voluntary finger flexion strength, but not the frictional coupling between a hand and handle (Rajulu, 1993;Young et al, 2009). Empirical evidence exists that frictional coupling affects a person's force exertion capability in push, pull, and twist (Seo et al, 2008a,b;Young et al, 2009;Seo et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies on power grip strength do not predict breakaway strength, because power grip strength addresses only the voluntary finger flexion strength, but not the frictional coupling between a hand and handle (Rajulu, 1993;Young et al, 2009). Empirical evidence exists that frictional coupling affects a person's force exertion capability in push, pull, and twist (Seo et al, 2008a,b;Young et al, 2009;Seo et al, 2010). In addition, different hand-handle coupling due to different handle shapes has also been shown to affect force exertion capability (Fothergill et al, 1992;Kong et al, 2007;Kong et al, 2008;Young et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Empirical evidence exists that frictional coupling affects a person's force exertion capability in push, pull, and twist (Seo et al, 2008a,b;Young et al, 2009;Seo et al, 2010). In addition, different hand-handle coupling due to different handle shapes has also been shown to affect force exertion capability (Fothergill et al, 1992;Kong et al, 2007;Kong et al, 2008;Young et al, 2009). These previous studies, however, are empirical and do not provide detailed biomechanical description of how both finger flexion strength and hand-handle frictional coupling contribute to breakaway strength.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hand breakaway strength model—Effects of glove use and handle shapes on a person's hand strength to hold onto handles to prevent fall from elevation

Hur

Motawar

Seo

2012

Journal of Biomechanics

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hand breakaway strength model—Effects of glove use and handle shapes on a person's hand strength to hold onto handles to prevent fall from elevation

Hur

Motawar

Seo

2012

Journal of Biomechanics

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“…Prehensility is an ability of modulated volumetric handgrip adaptation [31] to an object by the following essential articulations: radius-carpus, carpometacarpal, metacarpophalangeal, and interphalangeal. Of the above, especially the last two meet the specific conditions for holding an object [32,33].…”

Section: The Prehensility Of the Paddlementioning

confidence: 99%

Ergonomics of Prehensility in Pushing and Pulling Motions: An Anatomical and Biomechanical Overview

Szychlinska

Dullaert

Beumer

et al. 2017

JFMK

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Abstract:The hand represents one of the most remarkable expressions of humanization of the anterior limb. The anterior limb, at first ambulatory, underwent continuous evolution acquiring innumerable new functions. In the course of human evolution the hand has undergone continual structural and functional adaptations, characterized, among others, by enrichment of peripheral innervation and further development of the thumb. This development was accompanied by important changes in the brain and the relocation of the eyes, together allowing the muscle control and stereoscopic vision, necessary for a controlled grip. The anatomy of the hand is complex, intricate, and fascinating. Its integrity is absolutely essential for our everyday functional living. It is intimately correlated with the brain, both in the evolution of the species and in the development of the individual. Actually, we can state that we "think" and "feel" with our hands, hence, their contribution is essential to the mental processes of thought and feeling. The aim of this review is to evaluate the most typical hand quality, the prehensility and hence, the possibility of manoeuvring tools. Our attention is mainly focused on the hand anatomy and prehensility during pushing and pulling motions. In particular, our attention is directed toward the relationship existing between the hand prehensility and the volume of the object to be gripped. As an example, we use a grip of the paddle and, pushing and pulling motions during kayak paddling. Indeed, we are firmly convinced that the prehensility plays a crucial role not only in performing the stylistically correct paddling, but especially in realizing a more effective and powerful paddle stroke. This review highlights a great link existing between biomechanical and anatomical notions and sporting performance.

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“…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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Hand-Handhold Coupling: Effect of Handle Shape, Orientation, and Friction on Breakaway Strength

Abstract: This research shows that handhold shape, orientation, and friction are important in the safe design of grab rails or ladders.

Cited by 38 publications

References 36 publications

Hand breakaway strength model—Effects of glove use and handle shapes on a person's hand strength to hold onto handles to prevent fall from elevation

Hand breakaway strength model—Effects of glove use and handle shapes on a person's hand strength to hold onto handles to prevent fall from elevation

Ergonomics of Prehensility in Pushing and Pulling Motions: An Anatomical and Biomechanical Overview

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

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