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
T2  - 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
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/46015
SN  - 2037-7460
VL  - 30
IS  - 1
SP  - 79
EP  - 87
PB  - Unipress
CY  - Padova
ER  -