• Title/Summary/Keyword: Localized vibration

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Kinematic Analysis in Reaching Depending on the Localized Vibration Duration in Persons With Hemiparetic Stroke (국소 진동자극이 편마비 뇌졸중 환자의 팔 뻗기 수행에 미치는 영향에 대한 운동학적 분석)

  • Yoo, Eun-Young;Park, Ji-Hyuk;Kwon, Jae-Sung;Cho, Sang-Yoon;Lee, Bo-Mi;Kim, Yeong-Jo;Kim, Jae-Nam;Kim, Sun-Ho
    • Therapeutic Science for Rehabilitation
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    • v.7 no.3
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    • pp.79-88
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    • 2018
  • Objective : Localized vibration has been shown to have a positive effect on recovery of upper-limb motor function in patients with hemiparetic stroke, but there has been little research on kinematic analysis for qualitative changes in movement. This study investigated kinematic changes in elbow motion during reaching after localized vibration in persons with hemiparetic stroke. Methods : This study used a one-group, cross-over trial design. Ten chronic stroke patients randomly received localized vibrations on the affected biceps brachii for 5, 10, or 20 min, at 70 Hz. Kinematic analysis of reaching was measured using a 3-D motion analysis system. Variables included peak angular velocity, time to peak angular velocity, and movement units during elbow motion. Result : Affected side elbow motion during reaching was faster, smoother, and more efficient after 20 min localized vibration. Peak angular velocity increased (p<0.05), and time to peak angular velocity (p<0.05) and the movement unit were significantly decreased (p<0.05) during elbow motion for reaching. Conclusion : Localized vibration can improve kinematic components during reaching motion in persons with hemiparetic stroke.

Prevalence of the Vibration Syndrome among Rock-drillers in the Anthracite Mining Area (일부지역 탄광 착암 근로자의 진동증후군 유병율)

  • Roh, Jae-Hoon
    • Journal of Preventive Medicine and Public Health
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    • v.14 no.1
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    • pp.75-80
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    • 1981
  • Due to rapid industrialization and economic development, the occupational diseases have appeared as one of the social problems in Korea. Up until now little has been known about the prevalence rate, predisposing factors and symptomatology of the occupational disease due to localized vibration in Korea. The researcher intends to investigate the prevalence rate and affecting factors of the occupational disease due to localized vibration among rock-drillers in the anthracite mines. A total of 135 rock-drillers were interviewed and examined from May 15th to 31th, 1980. The results were revealed as follows; 1. The prevalence rate of the vibration syndrome among rock-drillers was 12.6%. 2. The latent period of the vibration syndrome was 6.8 years. 3. The prevalence rate of the vibration syndrome was not significantly different between smokers and non-smokers. 4. With the increase of total vibration exposure time, the prevalence rate of the vibration syndrome increased also. 5. The average vibration sensation threshold was high (6.4dB) in stage 1 of the vibration syndrome and low (-0.6dB) in stage 0. 6. The average pain sensation threshold was high (4.4g) in stage 1 of the vibration syndrome and low (2.5g) in stage 0.

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A Review on the Vibration Exposure Limits in Korea

  • Park, Hee Sok
    • Journal of the Ergonomics Society of Korea
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    • v.34 no.3
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    • pp.217-222
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    • 2015
  • Objective:The objective of this study is to review the exposure limits in the legislation, guidelines, and standards for human vibration in Korea. Background: There have been relatively less interests in vibration than other risk factors in Korea. However, the importance of vibration is increasing as industry and everyday life are more mechanized. Method: Various enforcements were examined including legislation, guidelines, and standards for whole-body vibration and localized vibration. Results: No exposure limits were found in legislation, guidelines, and standards for the human vibration in Korea. Conclusion: It is important to introduce new duties regarding vibration risks to the general duties. Further studies are expected on the vibration exposure limits appropriate for Korean people and job conditions. Application: The results from this study would be of help to induce more interests in human vibration to the occupational health and safety professionals of Korea.