A study of hand grip pressure distribution and EMG of finger flexor muscles under dynamic loads

Gurram, R.; Rakheja, Subhash; Gouw, Gerard J.

doi:10.1080/00140139508925140

Cited by 77 publications

(50 citation statements)

References 7 publications

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“…First, it is known that grip force increases when gripping a vibrating handle as compared to gripping a static handle (Radwin et al 1987), and that electrical activity of the finger flexor muscles increases with grip force, where the increase is larger at higher acceleration levels (Gurram et al 1995). Although the normalized EMG for the flexor and extensor muscles showed no significant differences as a function of bucking bar, the true internal effect on muscle force cannot be ascertained from this study.…”

Section: Discussioncontrasting

confidence: 39%

Ergonomic field assessment of bucking bars during riveting tasks

Jorgensen¹,

Viswanathan²

2005

PsycEXTRA Dataset

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Riveting tasks in aircraft manufacturing results in exposure to vibration from both rivet guns and bucking bars. Long term exposure to vibration has been associated with symptoms of vibration white finger and musculoskeletal disorders. Four different bucking bars of the same shape but different material and mass characteristics (90% tungsten, >90% tungsten, cold rolled and stainless steel) were investigated for vibration and grip muscle activity during a riveting task. The >90% and 90% tungsten bars (3.4 m/s 2 and 3.6 m/s 2 , respectively) resulted in significantly less mean resultant weighted acceleration when compared to the cold rolled and stainless steel (5.3 m/s 2 and 5.6 m/s 2 , respectively), whereas there was no difference in mean hand grip flexor or extensor muscle activity. These results suggest that for bucking tasks that allow access for the bucking bar size investigated, use of heavier but same sized tungsten bucking bars can reduce vibration transmission to the hand.

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Section: Discussioncontrasting

confidence: 39%

Ergonomic field assessment of bucking bars during riveting tasks

Jorgensen¹,

Viswanathan²

2005

PsycEXTRA Dataset

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“…The further advancement of these technologies may lead to more convenient and reliable methods for the measurement. So far, however, while the applied grip, push, and contact forces on several vibrating tools have been reported from a few studies 6,16,23,26) , limited information on the biodynamic force is available 27,28) . Thus, the fundamental characteristics of the biodynamic force have not been seriously investigated.…”

Section: Introductionmentioning

confidence: 99%

“…So far, however, such instrumentation installations have been shown to be expensive and/or fragile for many workplace environments. Some of these flexible sensors may also have significant hysteresis and non-linear behavior 23) . While such sensors may provide reasonable measurements of the pressure that is perpendicular to the contact surface, it is difficult to use such sensors to measure the tangential or friction force on the tool handles.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of Biodynamic Forces Distributed on the Fingers and the Palm Exposed to Vibration

Dong¹,

Welcome²,

Wu³

2005

Ind Health

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The hand-tool coupling force in the operation of a vibrating tool is generally composed of applied force (AF) and biodynamic force (BF). There is wide interest in quantifying the coupling force. The objectives of this study are to develop an effective method for estimating the BF and to investigate its fundamental characteristics. Using the biodynamic response of the hand-arm system, such as apparent mass or mechanical impedance, and the acceleration that can be measured on vibrating tools, this study proposed an indirect method for the BF estimation. The BFs distributed on the fingers and the palm of the hand along the forearm direction (z h -axis) in the operations of eighteen types of tool were estimated and used to identify the distributed BF characteristics. The results indicate that the BFs depend on both the tool vibration spectrum and the biodynamic properties of the hand-arm system. The dominant BF frequency component is usually at the same frequency as the dominant vibration frequency of each tool. The BF distributed on the palm (2-98 N) is much higher than that distributed on the fingers (1-30 N) at frequencies less than 100 Hz, but these biodynamic forces (2-22 N) are comparable at higher frequencies. The palm BF on several tools with relatively low dominant frequencies (≤ 40 Hz), especially in the resonant frequency range (16-40 Hz), is comparable with the applied palm force (50-100 N). Since the resonant frequency of the palm BF is also in the range of the dominant vibration frequencies of many percussive tools, the palm BF may be related to the disorders in the wrist-arm system. The BF on the fingers is likely to be closely related to the dynamic stresses and deformations in the fingers and it may thus be used to quantify the finger vibration exposure.

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“…A power-grasp produces a very uneven distribution of forces and, therefore, also pressure on the hand and fingers [17]. It has been shown, that any higher contact pressures than allowed for over a specific time can result in discomfort, pain, and acute traumatic disorders (ATD) and also cumulative traumatic disorders (CTD) [18,19]. Hand-handle contact-force and pressure are also handle diameter dependant [20,21].…”

Section: Introductionmentioning

confidence: 99%

Decision Support System for Generating Ergonomic Tool-Handles

Harih¹

2014

Int. j. simul. model.

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Tool-handle design research has been previously limited to determination of diameters of cylindrical handles to increase performance, comfort and avoid acute and cumulative traumatic disorders. However, there is still lack of correct shape determination and systemization of the ergonomic design knowledge. To overcome these limitations, methodology to develop optimal sized and shaped toolhandles for a target population previously developed has been integrated into an existing ergonomics and aesthetics decision support system. The system allows a correct determination of tool-handle size and shape according to the target population and provides general ergonomics knowledge. Resulting handles consider optimal diameters for each finger to maximize maximum voluntary contraction, comfort and contact area, which can lower the risk of acute and cumulative trauma disorders. The system allows development of ergonomic tool-handles with almost no prior ergonomics knowledge and without iterative design process, which decreases the designing time.

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A study of hand grip pressure distribution and EMG of finger flexor muscles under dynamic loads

Cited by 77 publications

References 7 publications

Ergonomic field assessment of bucking bars during riveting tasks

Ergonomic field assessment of bucking bars during riveting tasks

Estimation of Biodynamic Forces Distributed on the Fingers and the Palm Exposed to Vibration

Decision Support System for Generating Ergonomic Tool-Handles

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