caa a22 4500 467941874 CHVBK 20180406153015.0 cr unu---uuuuu 170328e20060601xx s 000 0 eng 10.1007/s00421-006-0166-0 doi (NATIONALLICENCE)springer-10.1007/s00421-006-0166-0 Exertion dependent alternations in force fluctuation and limb acceleration during sustained fatiguing contraction [Elektronische Daten] [Chien-Ting Huang, Ing-Shiou Hwang, Chien-Chun Huang, Ming-Shing Young] The study was conducted to contrast exertion-dependent changes in electromyography (EMG), force fluctuation (FF), and limb acceleration (LA) during isometric contraction to attain a versatile picture of muscle fatigue. Fifteen volunteers performed sustained index abduction at 25 and 75% maximal voluntary contractions (MVC) until failure at the tasks; meanwhile, changes in temporal/spectral features of force, muscle activity of the first dorsal interosseous (FDI), and acceleration of the index and hand were monitored. The results showed a manifest increase in all recorded signals for the 25% MVC paradigm, especially for LA, which demonstrated the largest increment in amplitude. In addition to progressive enhancement of the mechanical coupling of the metacarpophalangeal (MCP) joint, the 25% MVC paradigm added to EMG-FF and EMG-LA coherences (CohEMG-FF and CohEMG-LA) at 8-12Hz and the shift of the spectral peak of the LA to higher frequencies. In contrast, the 75% MVC paradigm did not modulate significantly the spectral peak of LA. Also, CohEMG-FF, CohEMG-LA at 8-12Hz, and the mechanical coupling of the MCP joint, were conversely undermined consequent to the high exertion paradigm. The present study suggests that LA was most susceptible to muscle fatigue following sustained contraction at a lower exertion level, and diverging alternations among various physiological signals ascribed to exertion-dependent contributions of central and peripheral origins to muscle fatigue. Springer-Verlag, 2006 Muscle fatigue nationallicence Force tremor nationallicence Isometric contraction nationallicence Electromyography nationallicence Huang Chien-Ting Department of Physical Therapy, College of Medicine, National Cheng Kung University, 701, Tainan, Taiwan aut Hwang Ing-Shiou Department of Physical Therapy, College of Medicine, National Cheng Kung University, 701, Tainan, Taiwan aut Huang Chien-Chun Department of Electrical Engineering, College of Electrical Engineering and Computer Science, National Cheng Kung University, 701, Tainan, Taiwan aut Young Ming-Shing Department of Electrical Engineering, College of Electrical Engineering and Computer Science, National Cheng Kung University, 701, Tainan, Taiwan aut European Journal of Applied Physiology Springer-Verlag 97/3(2006-06-01), 362-371 1439-6319 97:3<362 2006 97 421 https://doi.org/10.1007/s00421-006-0166-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00421-006-0166-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Huang Chien-Ting Department of Physical Therapy, College of Medicine, National Cheng Kung University, 701, Tainan, Taiwan aut NATIONALLICENCE 700 1- Hwang Ing-Shiou Department of Physical Therapy, College of Medicine, National Cheng Kung University, 701, Tainan, Taiwan aut NATIONALLICENCE 700 1- Huang Chien-Chun Department of Electrical Engineering, College of Electrical Engineering and Computer Science, National Cheng Kung University, 701, Tainan, Taiwan aut NATIONALLICENCE 700 1- Young Ming-Shing Department of Electrical Engineering, College of Electrical Engineering and Computer Science, National Cheng Kung University, 701, Tainan, Taiwan aut NATIONALLICENCE 773 0- European Journal of Applied Physiology Springer-Verlag 97/3(2006-06-01), 362-371 1439-6319 97:3<362 2006 97 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer