Muscle Oxygenation Level Might Trigger the Regulation of Capillary Venous Blood Filling during Fatiguing Isometric Muscle Actions

The regulation of oxygen and blood supply during isometric muscle actions is still unclear. Recently, two behavioral types of oxygen saturation (SvO<sub>2</sub>) and relative hemoglobin amount (rHb) in venous microvessels were described during a fatiguing holding isometric muscle action...

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Autores principales:	Silas Dech, Frank N. Bittmann, Laura V. Schaefer
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	muscle oxygen saturation hemoglobin amount isometric muscle action O2C spectrophotometer capillary recruitment blood flow Medicine (General) R5-920
Acceso en línea:	https://doaj.org/article/5b39785aae194217a134037579a8f6a7
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spelling	oai:doaj.org-article:5b39785aae194217a134037579a8f6a72021-11-25T17:20:23ZMuscle Oxygenation Level Might Trigger the Regulation of Capillary Venous Blood Filling during Fatiguing Isometric Muscle Actions10.3390/diagnostics111119732075-4418https://doaj.org/article/5b39785aae194217a134037579a8f6a72021-10-01T00:00:00Zhttps://www.mdpi.com/2075-4418/11/11/1973https://doaj.org/toc/2075-4418The regulation of oxygen and blood supply during isometric muscle actions is still unclear. Recently, two behavioral types of oxygen saturation (SvO<sub>2</sub>) 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<sub>2</sub> 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: <i>n</i> = 7, II: <i>n</i> = 17) and PIMA (I: <i>n</i> = 3, II: <i>n</i> = 9). During the fatiguing measurements, rHb decreased initially and started to increase in type II at an average SvO<sub>2</sub>-level of 58.75 ± 2.14%. In type I, SvO<sub>2</sub> 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.Silas DechFrank N. BittmannLaura V. SchaeferMDPI AGarticlemuscle oxygen saturationhemoglobin amountisometric muscle actionO2C spectrophotometercapillary recruitmentblood flowMedicine (General)R5-920ENDiagnostics, Vol 11, Iss 1973, p 1973 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	muscle oxygen saturation hemoglobin amount isometric muscle action O2C spectrophotometer capillary recruitment blood flow Medicine (General) R5-920
spellingShingle	muscle oxygen saturation hemoglobin amount isometric muscle action O2C spectrophotometer capillary recruitment blood flow Medicine (General) R5-920 Silas Dech Frank N. Bittmann Laura V. Schaefer Muscle Oxygenation Level Might Trigger the Regulation of Capillary Venous Blood Filling during Fatiguing Isometric Muscle Actions
description	The regulation of oxygen and blood supply during isometric muscle actions is still unclear. Recently, two behavioral types of oxygen saturation (SvO<sub>2</sub>) 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<sub>2</sub> 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: <i>n</i> = 7, II: <i>n</i> = 17) and PIMA (I: <i>n</i> = 3, II: <i>n</i> = 9). During the fatiguing measurements, rHb decreased initially and started to increase in type II at an average SvO<sub>2</sub>-level of 58.75 ± 2.14%. In type I, SvO<sub>2</sub> 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.
format	article
author	Silas Dech Frank N. Bittmann Laura V. Schaefer
author_facet	Silas Dech Frank N. Bittmann Laura V. Schaefer
author_sort	Silas Dech
title	Muscle Oxygenation Level Might Trigger the Regulation of Capillary Venous Blood Filling during Fatiguing Isometric Muscle Actions
title_short	Muscle Oxygenation Level Might Trigger the Regulation of Capillary Venous Blood Filling during Fatiguing Isometric Muscle Actions
title_full	Muscle Oxygenation Level Might Trigger the Regulation of Capillary Venous Blood Filling during Fatiguing Isometric Muscle Actions
title_fullStr	Muscle Oxygenation Level Might Trigger the Regulation of Capillary Venous Blood Filling during Fatiguing Isometric Muscle Actions
title_full_unstemmed	Muscle Oxygenation Level Might Trigger the Regulation of Capillary Venous Blood Filling during Fatiguing Isometric Muscle Actions
title_sort	muscle oxygenation level might trigger the regulation of capillary venous blood filling during fatiguing isometric muscle actions
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/5b39785aae194217a134037579a8f6a7
work_keys_str_mv	AT silasdech muscleoxygenationlevelmighttriggertheregulationofcapillaryvenousbloodfillingduringfatiguingisometricmuscleactions AT franknbittmann muscleoxygenationlevelmighttriggertheregulationofcapillaryvenousbloodfillingduringfatiguingisometricmuscleactions AT lauravschaefer muscleoxygenationlevelmighttriggertheregulationofcapillaryvenousbloodfillingduringfatiguingisometricmuscleactions
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Muscle Oxygenation Level Might Trigger the Regulation of Capillary Venous Blood Filling during Fatiguing Isometric Muscle Actions

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