Behavior of oxygen saturation and blood filling in the venous capillary system of the biceps brachii muscle during a fatiguing isometric action
- 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 roughThe 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.…
| Verfasserangaben: | Silas DechORCiD, Frank BittmannORCiDGND, Laura SchaeferORCiDGND |
|---|---|
| DOI: | https://doi.org/10.4081/ejtm.2019.8800 |
| ISSN: | 2037-7460 |
| Titel des übergeordneten Werks (Englisch): | European Journal of Translational Myology |
| Verlag: | Unipress |
| Verlagsort: | Padova |
| Publikationstyp: | Wissenschaftlicher Artikel |
| Sprache: | Englisch |
| Datum der Erstveröffentlichung: | 06.01.2020 |
| Erscheinungsjahr: | 2020 |
| Datum der Freischaltung: | 14.04.2020 |
| Freies Schlagwort / Tag: | O2C spectrophotometer; hemoglobin amount; isometric muscle action; muscle oxygenation |
| Band: | 30 |
| Ausgabe: | 1 |
| Seitenanzahl: | 9 |
| Erste Seite: | 79 |
| Letzte Seite: | 87 |
| Fördernde Institution: | Universität Potsdam |
| Fördernummer: | PA 2020_017 |
| Organisationseinheiten: | Humanwissenschaftliche Fakultät |
| DDC-Klassifikation: | 6 Technik, Medizin, angewandte Wissenschaften / 61 Medizin und Gesundheit / 610 Medizin und Gesundheit |
| Peer Review: | Referiert |
| Fördermittelquelle: | Publikationsfonds der Universität Potsdam |
| Publikationsweg: | Open Access |
| Lizenz (Deutsch): |  CC-BY-NC - Namensnennung, nicht kommerziell 4.0 International |
| Externe Anmerkung: | Zweitveröffentlichung in der Schriftenreihe Postprints der Universität Potsdam : Humanwissenschaftliche Reihe ; 618 |
