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

Dahlqvist, CamillaLund University,Lunds universitet,Arbetsrelaterade besvär i rörelseorganen,Forskargrupper vid Lunds universitet,Work-related musculoskeletal disorders,Lund University Research Groups,Skåne University Hospital (author)

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

QC 20210616
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.

Nordander, CatarinaLund University,Lunds universitet,Arbetsrelaterade besvär i rörelseorganen,Forskargrupper vid Lunds universitet,Work-related musculoskeletal disorders,Lund University Research Groups,Skåne University Hospital(Swepub:lu)ymed-cno (author)
Granqvist, LothyLund University,Lunds universitet,Arbetsrelaterade besvär i rörelseorganen,Forskargrupper vid Lunds universitet,Work-related musculoskeletal disorders,Lund University Research Groups,Skåne University Hospital(Swepub:lu)ymed-lgr (author)
Forsman, Mikael,ProfessorKarolinska Institutet(Swepub:kth)u1iq0ct2 (author)
Hansson, Gert ÅkeLund University,Lunds universitet,Avdelningen för arbets- och miljömedicin,Institutionen för laboratoriemedicin,Medicinska fakulteten,Division of Occupational and Environmental Medicine, Lund University,Department of Laboratory Medicine,Faculty of Medicine,Skåne University Hospital(Swepub:lu)ymed-gah (author)
Arbetsrelaterade besvär i rörelseorganenForskargrupper vid Lunds universitet (creator_code:org_t)

By the author/editor: Dahlqvist, Camil ...; Nordander, Catar ...; Granqvist, Lothy; Forsman, Mikael, ...; Hansson, Gert Åk ...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Mechanical Engin ...; and Production Engin ...

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Health Sciences; and Occupational Hea ...

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Basic Medicine; and Physiology

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Medical Engineer ...; and Other Medical En ...

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Health Sciences; and Health Care Serv ...

By the university: Royal Institute of Technology; Lund University; Karolinska Institutet

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