• Title/Summary/Keyword: grip

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Strength-dexterity Complementariness: Comparison between Left and Right Hands in Older Female Adults (근력-기민성 보완: 여성 노인의 오른손과 왼손 비교)

  • Park, Yang Sun;Park, Da Won;Koh, Kyung;Kwon, Hyun Joon;Shim, Jae Kun
    • Korean Journal of Applied Biomechanics
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    • v.31 no.4
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    • pp.227-233
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    • 2021
  • Objective: The purpose of this study was to in this study. The maximum grip force of the elderly hand was measured using a custom-designed grasping apparatus mounted with five three-component force transducers. The Jebsen-Tayler hand function test and Purdue Pegboard test were performed to evaluate the dexterity of the hand. Method: Twenty-six elderly women participated in the left hand between the maximum grip force and the Jebsen-Taylor hand function test results (r=-.513, p=.007). A significant correlation was also shown in the hand maximum grip force and the hand Purdue Pegboard results (r=.514, p=.007). However, no significant correlation was found in the right hand. Results: We found a significant correlation investigate the relationship between hand grip strength and hand dexterity in the elderly. Conclusion: Our findings in the current study support the theory of 'Strength-dexterity complementariness' which states that improvement in dexterity is associated with the grip force strength.

The Effects of Coordinative Locomotor Training using Elastic Band on Dynamic Balance and Grip Strength in Elementary School Baseball Player

  • Lee, Han-Gyeol
    • Physical Therapy Rehabilitation Science
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    • v.10 no.4
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    • pp.414-420
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    • 2021
  • Objective: The purpose of this study was to investigate the effects of coordinative locomotor training(CLT) using elastic bands on dynamic balance and grip strength for Elementary school baseball players and to provide correct posture guidance and reference on the prevention and rehabilitation program of sports damage and injury in the future. Design: Two groups pre-post randomized controlled design. Methods: Forty-six subjects were randomly divided in two groups;1) CLT using Elastic Band group(Experimental group, n=23), 2) Routine baseball training group(Control group, n=23). The intervention was conducted total 16 times for sixty minutes a day, 2 times a week, for 8 weeks. Evaluations of dynamic balance ability and grip strength were performed with all subjects before the commencement of training and 8 weeks after training. Results: Compared to the control group after training, the dynamic balance ability and dominant handgrip strength of the experimental group were significantly more improved(p<0.05). Conclusions: We confirmed that the effects of CLT using elastic bands on dynamic balance ability and grip strength in Elementary school baseball player. This study should be used for improving the quality of the Elementary school baseball player's training and would be contributed prevention and rehabilitation program of sports damage and injury.

Comparison of Hand Grip Strength, Dexterity, and Hand Function According to the Type of Glove

  • Ro, Hyo-Lyun
    • Journal of the Korean Society of Physical Medicine
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    • v.17 no.3
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    • pp.11-21
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    • 2022
  • PURPOSE: This study examined the changes in the handgrip strength, dexterity, and hand function according to the presence or absence of gloves and types of gloves. METHODS: Seventy-six adults in their twenties (male: 24, female: 52, mean age 21.04 years) were the subjects of this study. The handgrip strength, dexterity, and hand function were evaluated with bare hands without gloves, poly gloves, and latex gloves. The handgrip strength was measured using a dynamometer, and three pinch strength tests were performed: tip pinch, lateral pinch, and three-jaw pinch. The hand dexterity was evaluated using the Minnesota manual dexterity test, and the hand function was evaluated using the Jabson-Taylor hand function test. RESULTS: There was no difference in the grip strength depending on whether the gloves were worn. The hand grip, dexterity, and hand function showed significant differences according to the type of glove. Regarding the handgrip, dexterity, and hand function, the latex glove had the best function, and the poly glove had the lowest function. CONCLUSION: There was a difference in dexterity among the hand functions but no difference in grip strength according to the type of glove. The results suggest that the use of latex gloves in daily life be recommended.

Effect of grip pressure and center of gravity on golf swing (그립압력과 중심이동이 골프 스윙에 미치는 영향)

  • Lee, Kun-Chun;Song, Dae-Chan;Park, Jong-Dae;Cho, Chang-Ho
    • The Journal of Natural Sciences
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    • v.13 no.1
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    • pp.25-33
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    • 2003
  • Experiment setup was designed to observe the grip pressure and the center of gravity during golf swing. The experimental results of grip pressure and center of gravity during swing showed the constant type in the envelop of force intensity of a stable KPGA pro as a function of time.

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Tactile Transfer and Display Method using Data Glove and Vibration Motors Module (데이터 글로브와 진동모터를 이용한 촉각전달 및 제시 방법)

  • Kang, Hyung-Gu;Choi, Youngjin
    • Journal of Institute of Control, Robotics and Systems
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    • v.19 no.12
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    • pp.1138-1144
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    • 2013
  • This paper proposes a tactile transfer and display method between a data glove and vibration motors module. The data glove is developed to capture the hand postures and to measure the grip forces. The measured data are simplified with the proposed 5-bit transfer and display algorithm, and the vibration motors module is developed to display the measured hand posture and grip force to the operator. The proposed 5-bit algorithm contains both an 8-step hand posture and 4-step grip force level information for tactile transfer to the vibration motors module. Also, the effectiveness of the proposed method is shown through several experiments.

Hot Forging Analysis of Rotor Grip with Titanium Alloy for Unmanned Helicopter (무인헬기용 티타늄 합금 로터 그립의 열간성형해석)

  • Lee, Seong-Chul;Kong, Jae-Hyun;Hur, Kwan-Do
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.10 no.2
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    • pp.96-103
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    • 2011
  • Rotor grip is used as a component of rotor system in unmanned helicopter. Instead of usual machining, hot forging process has been considered to improve its proof stress against repeated loading conditions and crash in the farm-field. Die design and forming analysis have been performed according to the conditions such as billet volume, flash, cavity filling, and the distribution of damage during the forming by using FE analysis. In the results of analysis, the possibility of structural failure in the model has not been found because its maximum effective stress is much lower than yield strength of the titanium alloy. In the forging die design, flash has been allowed because of low production in the industrial field. Preform design was studied by using FE-analysis, and its optimal dimension was obtained in the hot forging of rotor grip with titanium alloy.

A Study on Development of the Tongs Apparatus for Curbstone (도로경계석 작업을 위한 집게장치 개발에 관한 연구)

  • Kim, Yong-Seok;Lee, Chang-Don;Han, Hyeon-Yong;Park, Sung-Ho;Yang, Soon-Young
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.17 no.5
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    • pp.107-115
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    • 2008
  • In this research, it has been developed the tongs mechanism by a friction force for curbstone working. This tongs apparatus was farmed to grip and rotate the rectangular curbstone. Specification of this tongs apparatus has been determined by considering a loading weight and reversal load preventing reversal of 1.5 ton excavator. And, specification of the linear actuator has been determined with considering mechanical structure and the operation power demanded by the grip pad friction of tongs apparatus. The safety of the part has been examined from the 3D numerical simulation of the tongs apparatus. The operation system has been arranged to grip and rotate curbstone by on-off switching. The prototype has been established to carry out experiment after installing 1.5 ton excavator.

A study on the determination of an optimal handle diameter for a signal billy (신호봉 손잡이의 최적 굵기 결정에 관한 연구)

  • 변승남;이동훈
    • Journal of the Ergonomics Society of Korea
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    • v.16 no.1
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    • pp.15-27
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    • 1997
  • The objectives of this study were twofold; (1) to determine an optimal handle size of a signal billy, based on the subjective assessment of grip comfort and (2) to investigate the relationship between hand anthropometry and the optimal handle size. Thirty-seven university male students were asked to rate seven cylindrical handles of different diameters in barehanded and gloved conditions, respectively. Among these handles, 3.5cm diameter of the handle size was found to be the most comfortable, in both bardhanded and gloved conditionsl. However, no statistically significant reduction in grip comfort occurred within handle diameter ranging from 2.5cm to 4.0cm. As the handle diameter was deivated from the range, grip discomfort in creased significantly. A Spearman rank correlation coefficient test revealed that hand anthropometries such as finger lengths, hand circumference, and hand thickness were statistically significant factors on the determination of the optimal handle size. The implications of these findings were discussed. The results of this study can be used as guidelines in designing the hand tools for power grip.

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THE ROLE OF NOISE IN THE GENESIS OF VIBRATION-INDUCED WHITE FINGER SYNDROME

  • Griefahn, Barbara;Fritz, Martin;Brode, Petyer;Koh, Kyung-Sim
    • Proceedings of the Acoustical Society of Korea Conference
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    • 1994.06a
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    • pp.644-649
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    • 1994
  • Recent studies reveal that grip forces due to repeated mechanical vasocompressions are most significant for the genesis of vibration-induced which finger syndrome (VWF). Therefore, exerted grip force was regarded as a dependent variable in 2 experiments and the effects of noise and vibrations of different weighted acceleration levels were studied. Neither grip forces nor peripheral blood flow as indicated by finger skin temperature were influenced by noise or vibrations. the cause of VWF is therefore presumed to be a concomitant variable which correlates with weighted accelerations and with grip forces as well. A possible factor is the weight of hand-held vibrating tools.

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Study on the Design of a Novel Adaptive Gripper (적응형 그리퍼 설계 연구)

  • Kim, Gi Sung;Kim, Han Sung
    • Journal of the Korean Society of Industry Convergence
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    • v.22 no.3
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    • pp.325-335
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    • 2019
  • In this paper, a novel adaptive gripper with underactuation is presented, which can change its configuration to parallel or power grip mode according to object shapes. Differently from the commercial adaptive gripper by RobotiQ, the proposed gripper includes an actual parallelogram inside a five-bar mechanism, which allows the free selection of actuator locations and can reduce actuation torques effectively. The forward and inverse kinematics for two grip modes and statics analysis have been analyzed. From the comparative design, the proposed gripper has about 20% smaller size, 3.7% larger stroke, and 30.5% smaller average actuation torque than the commercial one.