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RISS 인기검색어
- 검색키워드
- 저자 : Ping Yeap Loh (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Deformation of Median Nerve during Active and Passive Wrist Holding at Proximal Carpal Tunnel
( Ping Yeap Loh ),( Satoshi Muraki ) 한국감성과학회 2014 춘계학술대회 Vol.2014 No.-
The first objective of this study was to identify the deformation of the median nerve cross-sectional area (MNCSA) at different wrist active and passive holding positions. The second objective was to compare the wrist circumference, wrist width, and wrist depth between dominant and non-dominant hands. A total of eight right-handed healthy male adults (age 27.0 ±3.5 years) participated in this study. Ultrasound examination was performed at the proximal carpal tunnel to examine the median nerve on the transverse plane. A total of three wrist positions were examined, namely, wrist neutral, wrist flexion 30°, and wrist extension 30°, in active and passive holding positions for both dominant and non-dominant hands. Paired t-test showed significant differences between dominant (D) and non-dominant (ND) hands in wrist circumference, wrist width, and wrist depth (D = 39.6 ± 2.8 mm, ND = 38.3 ± 2.7 mm, p<0.01). The differences of MNCSA between dominant and non-dominant hands were significant (p<0.001) at both active (D = 7.93 ± 0.63 mm2, ND = 6.98 ± 0.42 mm2) and passive holding positions (D = 8.22 ± 0.72 mm2, ND = 7.06 ± 0.44 mm2). Two-way repeated-measures ANOVA showed that wrist flexion 30° and wrist extension 30°caused significant reductions in MNCSA when compared with wrist neutral (p<0.001) in both active and passive holding positions.
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Deformation of Median Nerve during Active and Passive Wrist Holding at Proximal Carpal Tunnel
Ping Yeap LOH,Satoshi MURAKI 대한인간공학회 2014 대한인간공학회 학술대회논문집 Vol.2014 No.5
The first objective of this study was to identify the deformation of the median nerve cross-sectional area (MNCSA) at different wrist active and passive holding positions. The second objective was to compare the wrist circumference, wrist width, and wrist depth between dominant and non-dominant hands. A total of eight right-handed healthy male adults (age 27.0 ± 3.5 years) participated in this study. Ultrasound examination was performed at the proximal carpal tunnel to examine the median nerve on the transverse plane. A total of three wrist positions were examined, namely, wrist neutral, wrist flexion 30°, and wrist extension 30°, in active and passive holding positions for both dominant and non-dominant hands. Paired t-test showed significant differences between dominant (D) and non-dominant (ND) hands in wrist circumference (D = 15.9 ± 0.6 cm, ND = 15.7 ± 0.6 cm, p<0.05), wrist width (D = 56.3 ± 3.6 mm, ND = 54.0 ± 2.1 mm, p<0.05), and wrist depth (D = 39.6 ± 2.8 mm, ND = 38.3 ± 2.7 mm, p<0.01). The differences of MNCSA between dominant and non-dominant hands were significant (p<0.001) at both active (D = 7.93 ± 0.63 mm<SUP>2</SUP>, ND = 6.98 ± 0.42 mm<SUP>2</SUP>) and passive holding positions (D = 8.22 ± 0.72 mm<SUP>2</SUP>, ND = 7.06 ± 0.44 mm<SUP>2</SUP>). Two-way repeated-measures ANOVA showed that wrist flexion 30° and wrist extension 30° caused significant reductions in MNCSA when compared with wrist neutral (p<0.001) in both active and passive holding positions. However, wrist active and passive holding did not have a significant effect on MNCSA changes. In conclusion, our findings showed that significant reduction of MNCSA was associated with wrist flexion-extension motion and there was significant bilateral asymmetry in physical characteristics of the wrist.
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Exploratory Study on the Impacts of Handle Vibration on the Hand and Forearm
Josefa Angelie Revilla,Ping Yeap Loh,Satoshi Muraki 대한산업공학회 2019 Industrial Engineeering & Management Systems Vol.18 No.4
This study investigated the immediate impacts of short-term handle vibration on hand functions, upper limb discomfort, and forearm muscle responses during hand grip test and task performance of seven healthy young adults. Thetask was to grip the handlebar for 5 minutes with 50% perceived strength under two conditions: with handle vibration(HV) and without handle vibration (NHV). Activities of forearm muscles namely flexor carpi radialis (FCR), flexor ofthe fingers (FF), flexor carpi ulnaris (FCU), and extensor digitorum (ED) were recorded using surface electromyography (EMG), while post-task hand tests for finger dexterity, strength, and sensibility were also measured. These fingerfunctions as well as muscle responses did not differ significantly between HV and NHV. The lacking effects might beassociated to the inconsistencies on grip force during task, perhaps participants let go of the handle during the latterpart. Meanwhile, perceived discomfort on the shoulder was significantly higher after HV than NHV and activity ofFCR, FF, and ED during maximal grip test were significantly different (p < 0.05) as well. Specifically, muscle activities were lower by 12-15% after HV than NHV, indicating that HV might have influenced the ability to grip hardly. Inconclusion, maximal grip test and discomfort rating can be a predictive parameter to determine the instantaneous effects of handle vibration.
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