Influence of Task and Tool Characteristics on Scissor Skills in Typical Adults

Mitchell, Anita Witt; Hampton, Carmen; Hanks, Mistie; Miller, Chelsea; Ray, Natalie

doi:10.5014/ajot.2012.004135

Cited by 7 publications

(9 citation statements)

References 11 publications

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“…Scissoring involves the overall movement of the arm, including not only the fingers but also the wrist, elbow, and shoulder. However, in hairdressing, most of the motion involves cutting along a straight line, which can be performed without substantial motion of wrist, elbow, and shoulder [2]. Thus, we limit our focus to hand motions.…”

Section: A Scissoringmentioning

confidence: 99%

Evaluation of Ergonomic Design Based on Dynamic Model of Scissor

Kim,

Lee,

2023

IEEE Access

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Unlike general scissors, many commercial hairdressing scissors reflect ergonomic design with handles that provide users with comfort, minimizing fatigue and the risk of injury. However, there has not been a lot of prior research on quantitatively evaluating the merits of ergonomic design. This paper proposes a quantitative criterion to evaluate the performance of commercial hairdressing scissors. An experiment was conducted using several hairdressing scissors to establish the quantitative evaluation criterion. It was discovered that more fingers were involved than required to create a scissoring, and these fingers exerted antagonistic forces during the scissoring. Incorporating this property, a dynamic model of scissor mechanics was developed to analyze the characteristics of redundant finger forces, and a corresponding load distribution algorithm was derived. Three different types of scissor designs were compared through simulation. It was observed that the more ergonomic design was applied to the scissor, the less rotational kinetic energy was consumed. As a result, we propose rotational kinetic energy consumption as the quantitative evaluation criterion. The results of this research will be useful in designing specific scissor designs.

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Section: A Scissoringmentioning

confidence: 99%

Evaluation of Ergonomic Design Based on Dynamic Model of Scissor

Kim,

Lee,

2023

IEEE Access

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“…Therefore, it is recommended to maintain the wrist joint in the neutral position to reduce pressure in the carpal tunnel when CTS occurs. The wrist joint and forearm maintain an almost neutral position during the opening and closing movements when cutting paper [9], but hairdressers use their forearm in the pronated position and wrist joint in the flexed and dorsiflexed position. Therefore, the pressure in the carpal tunnel is high, and the incidence of muscle malaise and pain is high [4].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the pressure in the carpal tunnel is high, and the incidence of muscle malaise and pain is high [4]. Small scissors are mainly held in the dominant hand, and cut an object by the opening and closing movements of the thumb and index, middle, and ring fingers [9,10]. A hairdresser bends the thumb to close the scissors and uses the weight of the handle to open the blades; this movement is mainly performed by the thenar eminence and flexor pollicis longus.…”

Section: Introductionmentioning

confidence: 99%

Usefulness of Scissors with a Power-Support Mechanism to Assist Thumb Movement: An Observational Study

et al. 2021

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Long-term repetitive movements, such as opening and closing scissors, increase strain on muscles and joints. Amplitude probability distribution function (APDF) analysis of surface electromyogram (sEMG) data was used to quantify the burden of muscle activity. We aimed to test the hypothesis that scissors with a power-support device assist repetitive thumb movements to reduce potential myoelectric activity. Twenty female university students who met the eligibility criteria performed a cutting experiment, with and without power-support device scissors. The primary outcome was a change in muscle load due to sEMG data that were analyzed using APDF, and the secondary outcomes investigated the occurrence of muscle fatigue and pain. The adductor pollicis muscle showed a significant decrease in muscle activity with power assistance. In addition, it was also found that fatigue and pain of the thumb and on the radial side of the forearm were significantly lower under the power-assisted conditions. The results of this study suggest that the assistive action of scissors with a power-support device compensate for muscle load on the thenar eminence. This may be used as a reference value to prevent the occurrence of hand disorders for hairdressers.

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“…Scissors, like all other tools, are extensions of the human body and help increase the speed, power and accuracy of the work [5,6]. Daily used hand tools may have a strong impact on health, on work performance and on local muscular areas, such as those involved in finger-bending movements [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Investigation of hand forces applied to a pruning tool – pilot study

Romano¹,

Caruso

Longo

et al. 2019

Ann Agric Environ Med.

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Introduction. Winter pruning is a cultivation practice necessary for maintaining the balance between the vegetative and the productive activity of plants and requires many working days using hand scissors. This operation involves the subjects carrying out a series of gestures that are repeated with considerable frequency, which are all musculo-skeletal disorders risk factors (MSDs) for the hand-wrist area. Objective. The aim of this study was to investigate the forces applied to pruning tools. Materials and method. Using a sensor matrix, peak and average forces were measured which are exerted while cutting branches of 3 different diameters, from 5 wine-grape cultivars. Samples were tested on 8 participants using sensored scissors to record, in 6 hand areas, the forces necessary to cut. Results. Results showed that while cutting, the factors which can impact the force employed (peak and average forces) by the subjects are branch diameter and percentage of branch humidity. Cut duration was inversely related to the size of the subject's hand. The middle finger area of the hand recorded the highest force average and peak levels, while the hand region least affected during the cuts was the farthest from the thumb. Conclusions. The study enabled the highlighting of which factors influence the forces employed by the operator while cutting grape branches, and to identify the hand regions where muscle activation is at its most. These findings can be relevant in preventing MSDs. Further studies need to be conducted with a larger number of subjects.

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Influence of Task and Tool Characteristics on Scissor Skills in Typical Adults

Cited by 7 publications

References 11 publications

Evaluation of Ergonomic Design Based on Dynamic Model of Scissor

Evaluation of Ergonomic Design Based on Dynamic Model of Scissor

Usefulness of Scissors with a Power-Support Mechanism to Assist Thumb Movement: An Observational Study

Investigation of hand forces applied to a pruning tool – pilot study

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