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  - 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  -