caa a22 4500 469055766 CHVBK 20180323132843.0 cr unu---uuuuu 170328e19920901xx s 000 0 eng 10.1007/BF00625067 doi (NATIONALLICENCE)springer-10.1007/BF00625067 Blood pressure response to low level static contractions [Elektronische Daten] [Nils Fallentin, Kurt Jørgensen] Summary: The present study re-examines the 15% MVC concept, i.e. the existence of a circulatory steady-state in low intensity static contractions below 15% of maximal voluntary contraction (MVC). Mean arterial blood pressure was studied during static endurance contractions of the elbow flexor and extensor muscles at forces corresponding to 10% and 40% MVC. Mean value for endurance time at 10% MVC was significantly longer for flexion [111.3 (SD 56.1) min] than for extension [18.1 (SD 7.5) min;n = 7]. At 40% MVC the difference in mean endurance time disappeared [2.3 (SD 0.7) min for elbow flexion and 2.3 (SD 0.7) min for elbow extension]. Mean arterial blood pressure exhibited a continuous and progressive increase during the 10% MVC contractions indicating that the 15% MVC concept would not appear to be valid. The terminal blood pressure value recorded at the point of exhaustion in the 10% MVC elbow extension experiment was identical to the peak pressure attained in the 40% MVC contraction. For the elbow flexors the terminal pressor response was slightly but significantly lower at 10% MVC [122.3 (SD 10.1) mmHg, 16.3 (SD 1.4) kPa] in comparison with 40% MVC [130.4 (SD 7.4) mmHg, 17.4 (SD 1.0) kPa]. When the circulation to the muscles was arrested just prior to the cessation of the contraction, blood pressure only partly recovered and remained elevated for as long as the occlusion persisted, indicating the level of pressure-raising muscle chemoreflexes. Based on blood pressure recordings obtained during the occlusion, it is suggested that the slight reduction in terminal pressor response seen in the 10% MVC elbow flexion experiment was due to a reduced chemoreflex drive characteristic of a slow twitch muscle group during prolonged low force contractions. Springer-Verlag, 1992 Static contractions nationallicence Blood pressure nationallicence Post-exercise occlusion nationallicence Muscle fatigue nationallicence Fallentin Nils Department of Physiology, National Institute of Occupational Health, Lersø Parkalle 105, DK-2100, Copenhagen, Denmark aut Jørgensen Kurt August Krogh Institute, Copenhagen, Denmark aut European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 64/5(1992-09-01), 455-459 0301-5548 64:5<455 1992 64 421 https://doi.org/10.1007/BF00625067 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00625067 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fallentin Nils Department of Physiology, National Institute of Occupational Health, Lersø Parkalle 105, DK-2100, Copenhagen, Denmark aut NATIONALLICENCE 700 1- Jørgensen Kurt August Krogh Institute, Copenhagen, Denmark aut NATIONALLICENCE 773 0- European Journal of Applied Physiology and Occupational Physiology Springer-Verlag 64/5(1992-09-01), 455-459 0301-5548 64:5<455 1992 64 421 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer