ISSN:
1439-6327
Keywords:
133Xe Clearance
;
Isometric Endurance
;
Muscle Blood Flow
;
Arm Muscles
;
Back Muscles
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract The endurance during sustained contraction of elbow, flexors, elbow extensors, and back extensors was tested in 3 human subjects. The force level used was varied between ca. 15 and ca. 75% of maximal isometric strength (IS). The clearance of133Xe from contracting muscles was registered during and after the endurance test. In this way it was possible to determine whether muscle blood flow (MBF) was increased or had stopped during the contraction. Experiments with artificial ischaemia of the upper arm together with MBF measurements showed that MBF was of no importance for continuing sustained contractions above a certain force level, which was 50, 25, and 40% of IS for elbow flexors, elbow extensors and back extensors, respectively. However, the level where longer lasting (〉15 min) sustained contraction is possible is directly related to MBF. These levels were 22, 15, and 20% IS for elbow flexors, elbow extensors, and back extensors, respectively.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00999914
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