id:"swepub:oai:DiVA.org:liu-27768"
Search: id:"swepub:oai:DiVA.org:liu-27768" > Myosin heavy chain ...
- 1 of 1
- Previous record
- Next record
- To hitlist
Myosin heavy chain isoforms influence surface EMG parameters : A study of the trapezius muscle in cleaners with and without myalgia and in healthy teachers
-
- Larsson, Britt (author)
- Lund 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
- Andersen, Jesper L (author)
- Kadi, Fawzi (author)
- show more...
- show less...
- (creator_code:org_t)
- Springer Science and Business Media LLC, 2002
- 2002
- English.
- In: European Journal of Applied Physiology. - : Springer Science and Business Media LLC. - 1439-6319 .- 1439-6327. ; 87:6, s. 481-488
- Journal article (peer-reviewed)
Abstract
Subject headings
Close
- The present study had two aims: (1) to investigate potential differences in proportion of myosin heavy chain isoforms in the trapezius muscle between female cleaners with and without trapezius myalgia and healthy teachers, and (2) to elucidate if myosin heavy chain composition and surface electromyogram (EMG) during an isokinetic endurance test of shoulder flexors are significantly related. The subjects were divided into three groups: (1) 25 female cleaners with diagnosed work-related trapezius myalgia, (2) 25 female cleaners without work-related trapezius myalgia, (3) a control group of 21 healthy female teachers who were not exposed to repetitive or static muscle work. All subjects performed a test involving 150 forward flexions using an isokinetic dynamometer. During the test surface EMG was recorded from the trapezius muscle. Muscle samples were obtained from the descending part of the trapezius muscle. The fibre type area percentage based on ATPase staining and the proportions of different MHC isoforms as determined by gel electrophoresis. The trapezius was dominated by MHC I (71%), followed by MHC IIA (22-24%), and MHC IIX (5-7%), no significant differences between the three groups of subjects were found. The proportion of MHC I correlated negatively with MHC IIA (r=-0.78, P<0.001) and MHC IIX (r= -0.53, P<0.001). Significant correlations existed between the proportion of the MHC isoforms and the corresponding proportion of the fibre type area, 27-45% of the variance was explained. The multivariate analysis of the three groups of subjects revealed that MHC variables showed intercorrelations with EMG (both amplitude and frequency variables). However, the directions of the relationships differed among the three groups, the cleaners with myalgia and the teachers showed the greatest similarities in patterns. Intrinsic muscle properties appear to influence the frequency content of the EMG, which is in contrast to some of the theoretical models of the EMG. Our data could suggest that monotonous work such as professional cleaning can change the relationships between muscle structure and the frequency content of the EMG.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Medicinska och farmaceutiska grundvetenskaper -- Fysiologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Basic Medicine -- Physiology (hsv//eng)
Keyword
- MEDICINE
- MEDICIN
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
- European Journal of Applied Physiology (Search for host publication in LIBRIS)
To the university's database
- 1 of 1
- Previous record
- Next record
- To hitlist
Find more in SwePub
- By the author/editor
- Larsson, Britt
- Andersen, Jesper ...
- Kadi, Fawzi
- Gerdle, Björn, 1 ...
- Björk, Jonas
- About the subject
-
- MEDICAL AND HEALTH SCIENCES
- MEDICAL AND HEAL ...
- and Basic Medicine
- and Physiology
- Articles in the publication
- European Journal ...
- By the university
- Linköping University
- Lund University
Search outside SwePub
- Extend your search to:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - National Library Systems
- LIBRIS.kb.se
