Comparing two methods to record maximal voluntary contractions and different electrode positions in recordings of forearm extensor muscle activity: Refining risk assessments for work-related wrist disorders

Autor: Mikael Forsman, Gert-Åke Hansson, Camilla Dahlqvist, Lothy Granqvist, Catarina Nordander
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Adult
Male
medicine.medical_specialty
electromyography
Electromyography
Wrist
Work related
Risk Assessment
03 medical and health sciences
0302 clinical medicine
Voluntary contraction
Physical medicine and rehabilitation
Forearm
medicine
Humans
0501 psychology and cognitive sciences
resisted wrist extension
Muscle
Skeletal
Electrodes
050107 human factors
Aged
Monitoring
Physiologic
Reproducibility
hand grip
Right forearm
medicine.diagnostic_test
Hand Strength
business.industry
05 social sciences
Rehabilitation
Public Health
Environmental and Occupational Health
Forearm Injuries
Middle Aged
musculoskeletal system
030210 environmental & occupational health
body regions
Technical risk assessment
medicine.anatomical_structure
normalization
Female
Extensor muscle
business
Research Article
Muscle Contraction
Zdroj: Work (Reading, Mass.)
ISSN: 1875-9270
1051-9815
Popis: BACKGROUND: Wrist disorders are common in force demanding industrial repetitive work. Visual assessment of force demands have a low reliability, instead surface electromyography (EMG) may be used as part of a risk assessment for work-related wrist disorders. For normalization of EMG recordings, a power grip (hand grip) is often used as maximal voluntary contraction (MVC) of the forearm extensor muscles. However, the test-retest reproducibility is poor and EMG amplitudes exceeding 100% have occasionally been recorded during work. An alternative MVC is resisted wrist extension, which may be more reliable. OBJECTIVE: To compare hand grip and resisted wrist extension MVCs, in terms of amplitude and reproducibility, and to examine the effect of electrode positioning. METHODS: Twelve subjects participated. EMG from right forearm extensors, from four electrode pairs, was recorded during MVCs, on three separate occasions. RESULTS: The group mean EMG amplitudes for resisted wrist extension were 1.2-1.7 times greater than those for hand grip. Resisted wrist extension showed better reproducibility than hand grip. CONCLUSIONS: The results indicate that the use of resisted wrist extension is a more accurate measurement of maximal effort of wrist extensor contractions than using hand grip and should increase the precision in EMG recordings from forearm extensor muscles, which in turn will increase the quality of risk assessments that are based on these. (Less)
Databáze: OpenAIRE
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