TY - GEN A1 - Dech, Silas A1 - Bittmann, Frank A1 - Schaefer, Laura T1 - Behavior of oxygen saturation and blood filling in the venous capillary system of the biceps brachii muscle during a fatiguing isometric action T2 - Postprints der Universität Potsdam : Humanwissenschaftliche Reihe 618 N2 - The objective of the study is to develop a better understanding of the capillary circulation in contracting muscles. Ten subjects were measured during a submaximal fatiguing isometric muscle action by use of the O2C spectrophotometer. In all measurements the capillary-venous oxygen saturation of hemoglobin (SvO2) decreases immediately after the start of loading and levels off into a steady state. However, two different patterns (type I and type II) emerged. They differ in the extent of deoxygenation (–10.37 ±2.59 percent points (pp) vs. –33.86 ±17.35 pp, P = .008) and the behavior of the relative hemoglobin amount (rHb). Type I reveals a positive rank correlation of SvO2 and rHb (? = 0.735, P <.001), whereas a negative rank correlation (? = –0.522, P <.001) occurred in type II, since rHb decreases until a reversal point, then increases averagely 13% above the baseline value and levels off into a steady state. The results reveal that a homeostasis of oxygen delivery and consumption during isometric muscle actions is possible. A rough distinction in two types of regulation is suggested. T3 - Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe - 618 KW - muscle oxygenation KW - hemoglobin amount KW - isometric muscle action KW - O2C spectrophotometer Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-460166 SN - 1866-8364 IS - 618 SP - 79 EP - 87 ER - TY - GEN A1 - Dech, Silas A1 - Bittmann, Frank A1 - Schaefer, Laura T1 - Muscle oxygenation level might trigger the regulation of capillary venous blood filling during fatiguing isometric muscle actions T2 - Postprints der Universität Potsdam : Humanwissenschaftliche Reihe N2 - The regulation of oxygen and blood supply during isometric muscle actions is still unclear. Recently, two behavioral types of oxygen saturation (SvO2) and relative hemoglobin amount (rHb) in venous microvessels were described during a fatiguing holding isometric muscle action (HIMA) (type I: nearly parallel behavior of SvO2 and rHb; type II: partly inverse behavior). The study aimed to ascertain an explanation of these two regulative behaviors. Twelve subjects performed one fatiguing HIMA trial with each arm by weight holding at 60% of the maximal voluntary isometric contraction (MVIC) in a 90° elbow flexion. Six subjects additionally executed one fatiguing PIMA trial by pulling on an immovable resistance with 60% of the MVIC with each side and same position. Both regulative types mentioned were found during HIMA (I: n = 7, II: n = 17) and PIMA (I: n = 3, II: n = 9). During the fatiguing measurements, rHb decreased initially and started to increase in type II at an average SvO2-level of 58.75 ± 2.14%. In type I, SvO2 never reached that specific value during loading. This might indicate the existence of a threshold around 59% which seems to trigger the increase in rHb and could explain the two behavioral types. An approach is discussed to meet the apparent incompatibility of an increased capillary blood filling (rHb) despite high intramuscular pressures which were found by other research groups during isometric muscle actions. T3 - Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe - 723 KW - muscle oxygen saturation KW - hemoglobin amount KW - isometric muscle action KW - O2C spectrophotometer KW - capillary recruitment KW - blood flow KW - holding isometric muscle action (HIMA) KW - pulling isometric muscle action (PIMA) Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-524078 SN - 1866-8364 IS - 11 ER - TY - JOUR A1 - Dech, Silas A1 - Bittmann, Frank A1 - Schaefer, Laura T1 - Behavior of oxygen saturation and blood filling in the venous capillary system of the biceps brachii muscle during a fatiguing isometric action JF - European Journal of Translational Myology N2 - The objective of the study is to develop a better understanding of the capillary circulation in contracting muscles. Ten subjects were measured during a submaximal fatiguing isometric muscle action by use of the O2C spectrophotometer. In all measurements the capillary-venous oxygen saturation of hemoglobin (SvO2) decreases immediately after the start of loading and levels off into a steady state. However, two different patterns (type I and type II) emerged. They differ in the extent of deoxygenation (–10.37 ±2.59 percent points (pp) vs. –33.86 ±17.35 pp, P = .008) and the behavior of the relative hemoglobin amount (rHb). Type I reveals a positive rank correlation of SvO2 and rHb (? = 0.735, P <.001), whereas a negative rank correlation (? = –0.522, P <.001) occurred in type II, since rHb decreases until a reversal point, then increases averagely 13% above the baseline value and levels off into a steady state. The results reveal that a homeostasis of oxygen delivery and consumption during isometric muscle actions is possible. A rough distinction in two types of regulation is suggested. KW - muscle oxygenation KW - hemoglobin amount KW - isometric muscle action KW - O2C spectrophotometer Y1 - 2020 U6 - https://doi.org/10.4081/ejtm.2019.8800 SN - 2037-7460 VL - 30 IS - 1 SP - 79 EP - 87 PB - Unipress CY - Padova ER - TY - JOUR A1 - Dech, Silas A1 - Bittmann, Frank A1 - Schaefer, Laura T1 - Muscle oxygenation level might trigger the regulation of capillary venous blood filling during fatiguing isometric muscle actions JF - Diagnostics : open access journal N2 - The regulation of oxygen and blood supply during isometric muscle actions is still unclear. Recently, two behavioral types of oxygen saturation (SvO(2)) and relative hemoglobin amount (rHb) in venous microvessels were described during a fatiguing holding isometric muscle action (HIMA) (type I: nearly parallel behavior of SvO(2) and rHb; type II: partly inverse behavior). The study aimed to ascertain an explanation of these two regulative behaviors. Twelve subjects performed one fatiguing HIMA trial with each arm by weight holding at 60% of the maximal voluntary isometric contraction (MVIC) in a 90 & DEG; elbow flexion. Six subjects additionally executed one fatiguing PIMA trial by pulling on an immovable resistance with 60% of the MVIC with each side and same position. Both regulative types mentioned were found during HIMA (I: n = 7, II: n = 17) and PIMA (I: n = 3, II: n = 9). During the fatiguing measurements, rHb decreased initially and started to increase in type II at an average SvO(2)-level of 58.75 & PLUSMN; 2.14%. In type I, SvO(2) never reached that specific value during loading. This might indicate the existence of a threshold around 59% which seems to trigger the increase in rHb and could explain the two behavioral types. An approach is discussed to meet the apparent incompatibility of an increased capillary blood filling (rHb) despite high intramuscular pressures which were found by other research groups during isometric muscle actions. KW - muscle oxygen saturation KW - hemoglobin amount KW - isometric muscle action KW - O2C spectrophotometer KW - capillary recruitment KW - blood flow KW - holding KW - isometric muscle action (HIMA) KW - pulling isometric muscle action (PIMA) Y1 - 2021 U6 - https://doi.org/10.3390/diagnostics11111973 SN - 2075-4418 VL - 11 IS - 11 PB - MDPI CY - Basel ER - TY - JOUR A1 - Dech, Silas A1 - Bittmann, Frank A1 - Schaefer, Laura T1 - Muscle oxygenation level might trigger the regulation of capillary venous blood filling during fatiguing isometric muscle actions JF - Diagnostics N2 - The regulation of oxygen and blood supply during isometric muscle actions is still unclear. Recently, two behavioral types of oxygen saturation (SvO2) and relative hemoglobin amount (rHb) in venous microvessels were described during a fatiguing holding isometric muscle action (HIMA) (type I: nearly parallel behavior of SvO2 and rHb; type II: partly inverse behavior). The study aimed to ascertain an explanation of these two regulative behaviors. Twelve subjects performed one fatiguing HIMA trial with each arm by weight holding at 60% of the maximal voluntary isometric contraction (MVIC) in a 90° elbow flexion. Six subjects additionally executed one fatiguing PIMA trial by pulling on an immovable resistance with 60% of the MVIC with each side and same position. Both regulative types mentioned were found during HIMA (I: n = 7, II: n = 17) and PIMA (I: n = 3, II: n = 9). During the fatiguing measurements, rHb decreased initially and started to increase in type II at an average SvO2-level of 58.75 ± 2.14%. In type I, SvO2 never reached that specific value during loading. This might indicate the existence of a threshold around 59% which seems to trigger the increase in rHb and could explain the two behavioral types. An approach is discussed to meet the apparent incompatibility of an increased capillary blood filling (rHb) despite high intramuscular pressures which were found by other research groups during isometric muscle actions. KW - muscle oxygen saturation KW - hemoglobin amount KW - isometric muscle action KW - O2C spectrophotometer KW - capillary recruitment KW - blood flow KW - holding isometric muscle action (HIMA) KW - pulling isometric muscle action (PIMA) Y1 - 2021 SN - 2075-4418 VL - 11 IS - 11 PB - MDPI CY - Basel ER -