Normal nerve conduction velocity and vibrotactile perception thresholds in computer users

Sandén, Helena; Edblom, Micael; Ekman, Anna; Tenenbaum, Artur; Wallin, B. Gunnar; Hagberg, Mats

doi:10.1007/s00420-005-0606-x

Cited by 9 publications

(10 citation statements)

References 7 publications

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“…The two groups differed in symptom profile. The findings of Murata et al[ 23 ] were in contrast to a recent study by Sandén et al[ 25 ] in which 82 secretaries with a median of 6 hours of daily computer work were compared to 35 nurses with very limited computer work. No statistically significant differences were found in the median nerve conduction velocity or in the vibration threshold between the two groups in t-test analyses.…”

Section: Resultsmentioning

confidence: 61%

“…Seven studies comparing median nerve function in computer users with groups without computer use were found [ 19 - 25 ]. Two of the studies assessed median nerve function with NCT [ 23 , 25 ] whereas the other five studies used vibration perception threshold testing. Vibration sense perception, however, is not a good indicator of CTS [ 26 ].…”

Section: Resultsmentioning

confidence: 99%

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Carpal tunnel syndrome and the use of computer mouse and keyboard: A systematic review

Thomsen

Gerr

Atroshi

2008

BMC Musculoskelet Disord

100

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Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 99%

Carpal tunnel syndrome and the use of computer mouse and keyboard: A systematic review

Thomsen

Gerr

Atroshi

2008

BMC Musculoskelet Disord

100

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“…Increasing evidence is linking peripheral nerve dysfunction to conditions with "non-specific" upper limb pain: While some studies found similar nerve conduction velocity and vibrotactile perception in healthy computer users and non-exposed controls [ 20 ] others have demonstrated sub-clinical median nerve impairment [ 21 ] and elevated threshold for perception of vibration [ 17 , 22 ] persisting along with symptoms [ 23 ]. A recent study demonstrated a 15% increased threshold for vibration in computer operators with paraestesiae in contrast to those without paraestesiae [ 14 ].…”

Section: Discussionmentioning

confidence: 99%

A cross-sectional study of the relation between symptoms and physical findings in computer operators

Jepsen

Thomsen

2006

BMC Neurol

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BackgroundThe character of upper limb disorder in computer operators is subject to debate. A peripheral nerve-involvement is suggested from the common presence of a triad of symptoms consisting of pain, paraestesiae and subjective weakness, and from physical findings suggesting neuropathy. This study aimed to examine the outcome of a detailed neurological examination in computer operators and to compare findings with the presence of symptoms.Methods96 graphical computer operators answered a modified Nordic Questionnaire including information on perceived pain in the shoulder, elbow, and wrist/hand scored for each region on a VAS-scale 0 – 9. In addition, they underwent a physical examination including the subjective assessment of the individual function of 11 upper limb muscles, of algesia in five and vibratory threshold in three territories, respectively, and of mechanosensitivity of nerves at seven locations. In order to reflect an involvement of the brachial plexus (chord level), the posterior interosseous nerve and the median nerve at elbow level we defined three patterns of neurological findings illustrating the course of nerves and their innervation. The pain scores summarized for the three upper limb regions (min. = 0, max = 27) in the mouse-operating and contralateral limbs were compared by a Wilcoxon test and the relation to each physical item analyzed by Kendall's rank correlation. The relation of summarized pain to each pattern was studied by application of a test of the trend across ordered groups (patterns).ResultsPain, paraestesiae and subjective weakness was reported for 67, 23, and 7 mouse-operating limbs, respectively, with the summarized pain scores exceeding 4 in 33 limbs. Abnormal physical findings were prevalent. The summarized pain was significantly related to a reduced function in five muscles, to mechanical allodynia at one location and to elevated threshold to vibration in two territories. Brachial plexopathy was diagnosed in 9/2, median neuropathy in 13/5 and posterior interosseous neuropathy in 13/8 mouse operating/contralateral limbs, respectively. The summarized pain was significantly higher in the mouse-operating limbs and in limbs with any of the defined patterns. There was a significant trend between the summarized pain and the summarized scores for the items contained in each pattern.ConclusionThis small-scale study of a group of computer-operators currently in work and with no or minor upper limb symptoms has indicated in symptomatic subjects the presence of peripheral nerve-afflictions with specific locations.

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“…These findings were consistent with those of Murata et al who assessed employees entering data for more than 6 hrs./day, and found significant differences in median sensory conduction velocities 14 . In contrast, Sanden et al reported no statistically significant difference in median nerve conduction velocity 15 . Due to the repetitive movements inherent in computer use, friction is produced, which may lead to the inflammatory changes and resultant nerve compression.…”

Section: Discussion and Resultsmentioning

confidence: 88%

The Effects of Working Hours on Nerve Conduction Test in Computer Operators

Ganeriwal¹,

Biswas²,

Srivastava³

2013

MOJ

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Background:Long hours of work at a computer can result in potential adverse effects such as pain, paraesthesia, and subjective weakness of upper extremities with associated decreased nerve conduction velocities of peripheral nerves (median and ulnar). Objective: To determine whether repetitive tasks performed for long hours by computer operators can lead to peripheral neuropathy as measured by nerve conduction studies of upper extremities. Material And Methods: We performed nerve conduction tests on 50 computer operators in two study groups. Group I consisted of computer operators who worked a minimum of 6 hours per day at the computer while Group II worked a maximum of 2 hours per day. Results: Significant differences were observed between groups for most physical signs. In addition, there were significant differences between the groups for nerve conduction velocities of the medial (motor & sensory) and ulnar (motor & sensory) nerves. Conclusion: We found symptoms of pain, paraesthesia and subjective weaknesses as well as decreased conduction velocities of peripheral nerves in computer operators who work long hours. Further nerve conduction studies are needed to confirm predictive value for the development of carpal tunnel syndrome.Key Wordscomputer operator, long work hours, nerve conduction studies

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Normal nerve conduction velocity and vibrotactile perception thresholds in computer users

Abstract: We saw no signs of early neural deficits of large sensory fibres in subjects who intensively use computer keyboard equipment.

Cited by 9 publications

References 7 publications

Carpal tunnel syndrome and the use of computer mouse and keyboard: A systematic review

Carpal tunnel syndrome and the use of computer mouse and keyboard: A systematic review

A cross-sectional study of the relation between symptoms and physical findings in computer operators

The Effects of Working Hours on Nerve Conduction Test in Computer Operators

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