• The Journal of Korean Physical Therapy
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• 제15권3호
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• pp.91-109
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• 2003

The grip strength is orthopedics department, the place where from rehabilitation medical science and industrial medical science and it evaluates the function of the hand certainly is the ability which is necessary. There is specially by an occupation rehabilitation of mentally retarded child and the evaluation of grip strength is one which is meaning. The samples for this study were 39 normal males and 59 normal females, 62 mentally retarded males, 33 mentally retarded females ranging in age from Prepubeal period to Adolescence. This study was used to measure grip strength BASELINE Hydraulic Hand Dynamometer manufactured by EEI(Fabrication Enterprises Incorporated)in USA. The objective of research from the Prepubeal period to Adolescence the normal and mentally retarded students comparison evaluates the grip strength and effective fine motor program of one's it makes with the fundamental data for a development and it does. The results are as follow : (1) The hand which the normal student and the schoolgirl of rises from grip strength measurement result of the Prepubeal period research object people 10.7Kg with the same left hand was each measured 10Kg with 9.8Kg with in. The grip strength of the mentally retarded schoolboys was the hand which rises 6Kg with the left hand 5.4Kg, the grip strength of the schoolgirls 6.5Kg with was identical. (2) The hand which the normal schoolboys and the schoolgirls rises from grip strength measurement result of the Adolescence research object people 29.6Kg, 20Kg the left hand to be was each measured 27.8Kg with 18.4Kg with. The hand which the mentally retarded schoolboys and the schoolgirls rises 13.1Kg, 11.3Kg the left hand to be was each measured 12.3Kg with 10.9Kg with. (3) Among the normal students $10.2\%$ (Prepubeal period $0.94\%$, Adolescence $15.2\%$) in Mentally Retarded students $17.9\%$ (Prepubeal period $0.77\%$, Adolescence $19.1\%$) left hand it was higher. (4) The grip strength of the students who attend school from the general family dwells were appeared higher than students residence at institution.

• 한국운동역학회지
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• 제31권4호
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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.

• 한국디자인학회:학술대회논문집
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• 한국디자인학회 2005년도 춘계 학술발표대회 논문집
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• pp.12-13
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• 2005

• 대한불안의학회지
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• 제3권2호
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• pp.104-109
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• 2007

Objective : In the present study, we evaluated the differences between the skin electric conductance of patients with posttraumatic stress disorder (PTSD) and normal controls in order to determine the possibility of using skin electric conductance as a diagnostic measure. Method : The PTSD group included 14 subjects who were diagnosed with PTSD in St. Mary's Hospital after a motor vehicle accident, and the normal control group included 12 healthy subjects. The conductivity and capacitance of both groups were measured twice, and the data from each group was compared. Results : There was no significant difference in gender, but the patients in the PTSD group were significantly older than those in normal control group. The activity (conductivity) between the left head-left hand, right hand-right head, and right head-left head was significantly elevated in the PTSD group as compared with the normal control group. In addition, the reactivity (capacitance) between the right head-left head, left head-left hand, right hand-left hand, right hand-right foot, right foot-left foot, and left foot-left hand was significantly elevated in the PTSD group. Conclusion : In this study, the skin electric conductance of the patients with PTSD was significantly elevated in comparison with that of the healthy subjects. Although there were some limitations of this study, the results of this study suggested that skin electric conductance can be used to evaluate elevated psychophysiological responses in patients with PTSD. Future studies with more subjects and more structure are needed in order to confirm our results.

• 한국산업보건학회지
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• 제25권4호
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• pp.554-565
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• 2015

Objectives: The purpose of this study was to measure estheticians' grip and pinch strength in the hand parts and identify related factors according to general characteristics. Methods: A Jamar dynamometer was used to measure grip strength and a Jamar pinch gauge was used to measure tip, palmar and lateral pinch strength. General data were collected through a questionnaire survey among 116 estheticians from 31 skin care centers and spas. Results: The subjects' mean grip strength was 23.95 kgf for the right hand and 23.42 kgf for the left hand with the dominant right hand recording slightly higher mean grip strength. Their mean pinch strength was the highest with lateral pinch(right 4.89 kgf, left 4.69 kgf), which was followed by palmar pinch(right 3.77 kgf, left 3.88 kgf) and tip pinch(right 2.29 kgf, left 2.25 kgf), in that order. Conclusions: The grip and pinch strength of the hand parts was high when estheticians' commonly used both hands for massage instead of just one. The use of both hands is recommended to protect the hand parts during massage.

• 한국산업보건학회지
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• 제5권2호
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• pp.147-159
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• 1995

This study was conducted to introduce fundamental data of hand-arm vibration and noise exposure levels with impact wrenches(double-hammer impact wrenches and oil-pulse impact wrenches) used in automobile assembly lines considering the process variables and tool variables. In studing, products per day, required time screwing the bolts or nuts per bolts or nut were considered as process variables, and capacity of bolts or nuts, air consumptions per minute, tool weights, RPM were considered as tool variables. Hand-arm vibration levels of 3 axis in each hand were measured using the instruments compling with ISO/DIS 5349 and noise levels were measured using a noise logging dosimeter. The results were as follows : 1. Required time to screwing the bolt or nut by oil-pulse impact wrenches is shorter than double-hammer impact wrenches but total daily exposure time of oil-pulse impact wrenches was higher than double-hammer impact wrenches because the number of bolts or nuts per cycle was many. 2. Oil-pulse impact wrenches have been used to screwing the large bolt or nut in comparing with double-hammer impact wrenches and required time to screwing the bolts or nuts were shorter than double-hammer impact wrenches because oil-pulse impact wrenches were using high RPM and large air consumption per minute. Noise level of oil-pulse impact wrenches was 8 dB(A) lower than double-hammer impact wrenches. 3. Dominant hand-arm vibration levels of double-hammer impact wrenches in each hand were $8.24m/sec^2$ of Zh axis in right hand and $9.60m/sec^2$ of Xh axis in left hand. Dominant hand-arm vibration level of oil-pulse impact wrenches in each hand was $2.59m/sec^2$ of Xh axis in right hand and $3.23m/sec^2$ of Yh axis in left hand. 4. In double-hammer impact wrenches, corresponding hand-arm vibration levels of Xh, Yh, Zh axis in left hand were higher than hand-arm vibration levels of right hand in 3 axis. In oil-pulse impact wrenches, Xh axis of right, Yh axis of left, Zh axis of left were higher than the corresponding hand-arm vibration levels of Xh, Yh, Zh axis in right and left hand. 5. Correlation coefficients among Xh, Yh. Zh axis of right and left hand hand-arm vibration levels in double-hammer impact wrenches and oil-pulse impact wrenches were commonly high in Yh axis and correlation coefficients of Yh axis in double-hammer impact wrenches and oil-pulse impact wrenches were 0.76 and 0.86,respectively. 6. As a measure repetitiveness, plotting total daily exposure time with the number of bolts or nut per cycle, direct correlation was shown between repetitiveness and hand-arn vibration exposure, and correlation coefficient between the number of bolts or nut per cycle and total daily exposure time in double-hammer impact wrenches, oil-pulse impact wrenches were 0.84 and 0.50, respectively. 7. Considering the total acceleration level and tool variables in double-hammer impact wrenches and oil-pulse impact wrenches, air consumption in right hand, and bolt or nut capacity in left hand were commonly the variable that explainability was high. Considering the noise and tool variables in double-hammer impact wrenches and oil-pulse impact wrenches, air consumption per minute was commonly the variable that explainability was high.

• 대한인간공학회지
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• 제30권5호
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• pp.621-628
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• 2011

Objective: The aim of this study is to give interest about usability of cellular phone keypad for left-handed person. Background: Although there are being a lot of attempts to design suitable product on user's request in process that design cellular phone keypad, ergonomic access about left-handed person who compose decimal class is unprepared. Especially, in early user's occasion, left-handed persons need more efforts than right-handed person to master Hangul character input process skill level. But, since realization about this left-handed person's discomfort has not spread, the importance has not been well thought in the society. Method: (1) After extracting emblem to use in comparison in questionnaire, applied emblem uniformly to different 3 kind of cellular phone. (2) Measured Hangul input time and mistyping number by dominant hand's position and skill level to reagent. (3) Taking the result through ANOVA. Conclusion: In the result of the experiment about Hangul input time and mistyping number according to dominant hand's position and skill level, left-handed person's group on the low skill level has shown the dullest use capability among 4 experiment groups. Application: In the future, analysis result may be used to the data of realization conversion in process design of various products including cellular phone keypad to consider left-handed person.

• 대한물리치료과학회지
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• 제16권4호
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• pp.59-65
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• 2009

Background: Human body is formed of symmetric bilateral structures that are comprised of eye, upper arm, lower arm and etc. but, we are used only dominant components. The purpose of this study was to analysis length cognition ability in dominant eye & hand. Method: Total 180 persons (male 32, female 138) were participated in this study. They were tested with 'hole in the card' test for identification of dominant eye's side and the question for identification of dominant hand's side, then the length cognition ability was measured in right & left axillary level by describing 10cm line. Results: The results by independent t-test were as follows. In difference of length cognition ability in right axillary level between right dominant eyed group & left dominant eyed group, right dominant eyed group was superior to left dominant eyed group, but significant difference was not existed statistically(p>.05). In left axillary level, right dominant eyed group was superior to left dominant eyed group, but significant difference was not existed statistically(p>.05). In axillary level of dominant eye's side, non-crossed group was superior to crossed group, but significant difference was not existed statistically(p>.05). In axillary level of non-dominant eye's side, non-crossed group was superior to crossed group, but significant difference was not existed statistically(p>.05). Conclusion: These result can be applied to the learning of palpation & observation skill in physical therapy.

• 대한의용생체공학회:의공학회지
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• 제38권4호
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• pp.143-152
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• 2017

The main purpose of this research was to examine the EMG characteristics of driver's upper limb and driving performance for operating accelerator and brake pedal by using four types of left hand control devices(Push/Pull, Push/Right angle, Push/Rock, Push/Twist) during simulated driving. The persons with disabilities in the lower extremity have problems in operation of the vehicle because of functional impairments for controlling accelerator and brake pedal. Therefore, if hand control device is used for adaptive driving controls in persons with lower extremity loss, the disabled people could improve their quality of mobility life by driving a car. Twenty subjects were involved in this research to assess driving performance and EMG activities for operating accelerator and brake pedal by using four types of left hand controls in driving simulator. We measured EMG responses of six muscles(posterior deltoid, middle deltoid, biceps, triceps, extensor carpi radialis, and flexor carpi radialis) during pulling and pushing movement with four types of left hand controls for acceleration and braking. STISim Drive 3 program was used for evaluation test of four types of left hand control devices in straight lane course for time to reach target speed and brake reaction time. While operating the four types of left hand controls for acceleration, EMG activities of posterior deltoid in normal subjects were significantly increased(p < 0.05) compared to the disabled subjects. It was also found that EMG responses of triceps and posterior deltoid were significantly increased(p < 0.05) when using the Push/Right angle type than Push/Pull type. While operating the four types of left hand controls for braking, EMG activities of flexor carpi radialis and triceps in subjects with disability were significantly increased(p < 0.05) compared to the normal subjects. It was shown that muscle responses of posterior deltoid, middle deltoid and triceps were significantly increased when using the Push/Right angle type than Push/Rock type. Time to reach target speed and brake reaction time in subjects with disability was increased by 2.5% and 4.6% on average compared to normal subjects. The person with disabilities showed a tendency to relatively slow performance in acceleration at the straight lane course.

• 한국운동역학회지
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• 제17권1호
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• pp.41-52
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• 2007

The present study analyzed the two hand backhand stroke motion of six female high school tennis players who won the championship at the National Athletic Meeting in 2006, and drew conclusions as follows. The open angle of the racket at the moment of impact was 90 degree without significant difference among the players, making a wide contact between the ball and the racket. The racket angle was 43 degree at take back and 91 at impact, showing a style of holding the racket rather upright in general. In back swing from the top to the impact, the shoulders and the hips turned by 97 degree and 40 degree, respectively. At the moment of impact, the height of the impact was 54%H, and the position of the impact was 10%H ahead of and 37%H left from the central axis of the body. The right hand made a continental grip and the left hand made a Western or semi Western grip. Through the entire swing motion, the grip angle of the left hand was smaller than that of the right hand, and those who maintained a large grip angle of the right hand at the moment of take back put the racket head slightly farther from the body. In the swing of the racket head from the lowest point to the impact, the vertical length of movement was 11%H and the horizontal length of movement was 60%H, quite long.