caa a22 4500 467941378 CHVBK 20180406153013.0 cr unu---uuuuu 170328e20060101xx s 000 0 eng 10.1007/s00421-004-1216-0 doi (NATIONALLICENCE)springer-10.1007/s00421-004-1216-0 Muscle tissue oxygenation, pressure, electrical, and mechanical responses during dynamic and static voluntary contractions [Elektronische Daten] [Pernille Vedsted, Anne Blangsted, Karen Søgaard, Claudio Orizio, Gisela Sjøgaard] Dynamic muscle contractions have been shown to cause greater energy turnover and fatigue than static contractions performed at a corresponding force level. Therefore, we hypothesized that: (1) electro- (EMG) and mechanomyography (MMG), intramuscular pressure (IMP), and reduction in muscle oxygen tension (rTO2) would be larger during dynamic (DYN) than intermittent static (IST) low force contractions; and that (2) oxygen tension would remain lower in the resting periods subsequent to DYN as compared to those following IST. Eight subjects performed elbow flexions with identical time-tension products: (1) DYN as a 20° elbow movement of 2s concentric and 2s eccentric followed by a 4s rest; and (2) IST with a 4s contraction followed by a 4s rest. Each session was performed for 1min at 10 and 20% of the maximal voluntary contraction (MVC). The force, bipolar surface EMG, MMG, IMP, rTO2 were measured simultaneously from the biceps brachii, and the data presented as the mean values together with the standard error of the means. Comparison of the corresponding time periods showed the EMGrms and MMGrms values to be larger during DYN than IST (concentric phase: DYN vs IST were 14.2 vs 9.4, and 22.0 vs 15.9%max−EMGrms; eccentric phase: in DYN, the MMG was ~1.5 and ~2.0-fold IST at 10 and 20%MVC, respectively). In contrast, the IMP of the concentric phase in DYN was lower than in IST (2.3 vs 29.5 and 10.9 vs 42.0mmHg at 10 and 20%MVC, respectively), and a similar picture was seen for the eccentric phase. However, no differences were seen in rTO2 in either the contraction or the rest periods. In a prolonged rest period (8s) after the sessions, DYN but not IST showed rTO2 above baseline level. In conclusion, rTO2 in DYN and IST were similar in spite of major differences in the MMG and EMG responses of the muscle during contraction periods. This may relate to the surprisingly lower IMP in DYN than IST. Springer-Verlag, 2004 Electromyography nationallicence Mechanomyography nationallicence Intramuscular pressure nationallicence Time-tension products nationallicence Human biceps brachii nationallicence Vedsted Pernille Department of Physiology, National Institute of Occupational Health, Lersø Parkallé 105, 2100, Copenhagen, Denmark aut Blangsted Anne Department of Physiology, National Institute of Occupational Health, Lersø Parkallé 105, 2100, Copenhagen, Denmark aut Søgaard Karen Department of Physiology, National Institute of Occupational Health, Lersø Parkallé 105, 2100, Copenhagen, Denmark aut Orizio Claudio Dipartimento Scienze Biomediche e Biotecnologie, Università degli Studi di Brescia, Viale Europa 11, 25123, Brescia, Italy aut Sjøgaard Gisela Department of Physiology, National Institute of Occupational Health, Lersø Parkallé 105, 2100, Copenhagen, Denmark aut European Journal of Applied Physiology Springer-Verlag 96/2(2006-01-01), 165-177 1439-6319 96:2<165 2006 96 421 https://doi.org/10.1007/s00421-004-1216-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00421-004-1216-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Vedsted Pernille Department of Physiology, National Institute of Occupational Health, Lersø Parkallé 105, 2100, Copenhagen, Denmark aut NATIONALLICENCE 700 1- Blangsted Anne Department of Physiology, National Institute of Occupational Health, Lersø Parkallé 105, 2100, Copenhagen, Denmark aut NATIONALLICENCE 700 1- Søgaard Karen Department of Physiology, National Institute of Occupational Health, Lersø Parkallé 105, 2100, Copenhagen, Denmark aut NATIONALLICENCE 700 1- Orizio Claudio Dipartimento Scienze Biomediche e Biotecnologie, Università degli Studi di Brescia, Viale Europa 11, 25123, Brescia, Italy aut NATIONALLICENCE 700 1- Sjøgaard Gisela Department of Physiology, National Institute of Occupational Health, Lersø Parkallé 105, 2100, Copenhagen, Denmark aut NATIONALLICENCE 773 0- European Journal of Applied Physiology Springer-Verlag 96/2(2006-01-01), 165-177 1439-6319 96:2<165 2006 96 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer