The influence of wrist position on the force produced by the finger flexors

Hazelton, Frank; Smidt, Gary L.; Flatt, Adrian E.; Stephens, R. I.

doi:10.1016/0021-9290(75)90082-2

Cited by 133 publications

(53 citation statements)

References 7 publications

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“…In this position of slight adduction contraction of the long flexors is optimal [Hazelton et al, 1975]. Female subjects had significantly weaker grip strengths than those of male subjects throughout the study as previously shown by a number of authors [Thorngren and Werner, 1979;O'Driscoll et al, 1992;Crosby et al, 1994].…”

Section: Discussionsupporting

confidence: 60%

A New Manual Power Grip

Dawson

Felle²,

O'Donovan³

1998

Cells Tissues Organs

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A manual power grip for holding a cylindrical object using a relaxed index finger is described and analysed. In a group of 21 young adult students it provided greater grip strength than the conventional oblique power grip. It allowed a significant increase in the range of adduction-abduction at the wrist. In recent years it appears to have been empirically used by a number of top class racquet players and is the basis of the modern assault rifle grip. A new design of strain gauge dynamometer, in the shape of a cylinder, which permits the testing of a number of grip types and wrist positions is described. Standard grip testing protocol is used with this device which also allows the concomitant use of a goniometer for the assessment of wrist mobility.

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Section: Discussionsupporting

confidence: 60%

A New Manual Power Grip

Dawson

Felle²,

O'Donovan³

1998

Cells Tissues Organs

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“…It has been known that the finger forces during grasping force production or grasping moment production are affected by the wrist positions (Hazelton et al 1975, Fong and Ng 2001, Jung and Hallbeck 2002, Li 2002. In particular, (Dumont et al 2006) recently made a study of repetitive dynamic movements of wrist flexion -extension with a cylindrical handle and reported that sharing of digit-tip forces at contacts with the handle varied throughout the wrist movements.…”

Section: Sharing Of Normal Forces and Moments Of Tangential Forces Bementioning

confidence: 99%

Multi-digit maximum voluntary torque production on a circular object

et al. 2007

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Individual digit-tip forces and moments during torque production on a mechanically fixed circular object were studied. During the experiments, subjects positioned each digit on a 6-dimensional force/ moment sensor attached to a circular handle and produced a maximum voluntary torque on the handle. The torque direction and the orientation of the torque axis were varied. From this study, it is concluded that: (1) the maximum torque in the closing (clockwise) direction was larger than in the opening (counter clockwise) direction; (2) the thumb and little finger had the largest and the smallest share of both total normal force and total moment, respectively; (3) the sharing of total moment between individual digits was not affected by the orientation of the torque axis or by the torque direction, while the sharing of total normal force between the individual digit varied with torque direction; (4) the normal force safety margins were largest and smallest in the thumb and little finger, respectively.

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“…의 악력 차이(주로 쓰지 않는 손은 주로 쓰는 손 악력의 80~89%)를 연구하였다 (Pheasant and Scriven, 1983;Härkönen et al, 1993;Talsania and Kozin, 1998). 본 연구에서 분석된 총 악력에 대한 각 손가락들의 힘과 기여도는 기존 연구들과 유사한 결과를 보인다 (Hazelton et al, 1975;Ohtsuki, 1981;Amis, 1987;Talsania and Kozin, 1998;Kong and Lowe, 2005a …”

Section: 서 론unclassified

Evaluation of Individual Finger Force to Grip Strength in Various Grip Spans and Hand Sizes

2007

Journal of the Ergonomics Society of Korea

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In this study, six grip spans (45mm~65mm) were tested to evaluate the effects of handle grip span and user's hand size on maximum grip strength, individual finger force, and subjective ratings of comfort using a digital dynamometer with individual force sensors. Forty-six males were assigned into three hand size groups according to their hand lengths. Results showed that overall 55mm and 50mm grip spans were the most comfortable sizes and associated with the highest grip strength in the maximum grip force exertions, whereas 65mm grip span was rated as the least comfortable size as well as the lowest grip strength. In the interaction effect of grip span and hand size, small and middle hand sized participants rated the best preference and the least preference grip spans differently with large hand sized participants. With respect to the analysis of individual finger force, the middle finger force was the strongest and the highest contribution to the total finger force, followed by ring, index and little fingers. In addition, it was noted that each finger had a different optimal grip span for exerting maximum force resulting in a bowed contoured shaped handle for two-handle hand tools. Thus, the grip spans for two-handle hand tools might be designed according to the users' hand and finger anthropometrics to maximize performance and subjective perception of comfort.

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The influence of wrist position on the force produced by the finger flexors

Cited by 133 publications

References 7 publications

A New Manual Power Grip

A New Manual Power Grip

Multi-digit maximum voluntary torque production on a circular object

Evaluation of Individual Finger Force to Grip Strength in Various Grip Spans and Hand Sizes

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