Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
Löscher, WN; Gallasch, E.
Myo-electric signals from two extrinsic hand muscles and force tremor during isometric handgrip.
EUR J APPL PHYSIOL OCCUP PHYS. 1993; 67(2): 99-105.
Doi: 10.1007/BF00376651
Web of Science
PubMed
FullText
FullText_MUG
- Co-Autor*innen der Med Uni Graz
- Gallasch Eugen
- Altmetrics:
- Dimensions Citations:
- Plum Analytics:
- Scite (citation analytics):
- Abstract:
- The objective of the present study was to investigate the myo-electric signs of muscle fatigue and the isometric force tremor of two extrinsic hand muscles, extensor digitorum communis and flexor digitorum superficialis, during isometric power grip. In addition, the synergy between flexor and extensor muscles and hand differences in a right-handed population have been studied. During isometric hand-dynamometry the myo-electric signal was recorded using surface electrodes and isometric force tremor was recorded using a special load cell. Eight subjects participated in this study and contractions were performed at 20%, 40%, 60% and 80% of maximal voluntary contraction (MVC) with left and right hands. The decrease of mean power frequency (MPF) with duration of contraction was greater in the left extensor as compared to the ipsilateral flexor muscle. No differences in the decrease in MPF with the duration of the contraction were found between the right extensor and flexor muscles. Isometric force tremor root mean square did not change during contractions at a given contraction level. Isometric tremor amplitude increased from 20% to 60% MVC and decreased at higher contraction levels. Tremor amplitude was higher in the left hand at all contraction levels but 60% MVC. These data would suggest differences in fatiguability and muscle fibre composition between the dominant and nondominant hand, which may be due to preferred use. The significance of force tremor for the evaluation of recruitment order and muscle fatigue is discussed.
- Find related publications in this database (using NLM MeSH Indexing)
- Adult -
- Body Composition - physiology
- Electromyography - physiology
- Female - physiology
- Functional Laterality - physiology
- Hand - physiology
- Humans - physiology
- Isometric Contraction - physiology
- Male - physiology
- Muscles - physiology
- Tremor - physiopathology
- Find related publications in this database (Keywords)
- Surface Electromyography
- Isometric Tremor
- Hand Dominance
- Muscle Fiber Composition
- Extrinsic Hand Muscles