Po2 changes in tendon and the synovial fluid of the rabbit hindlimbs during hypoxia and muscle exercise.
- VernacularTitle:低酸素及び運動時のけん・けん滑液のＰＯ２変動について
- Author:
HIDEAKI KOMIYA
;
JUN-ICHI MAEDA
;
TAKASHI TAKEMIYA
- Publication Type:Journal Article
- Keywords:
innervation and denervation;
Oxygen supply system;
tendon microcirculation
- From:Japanese Journal of Physical Fitness and Sports Medicine
1987;36(3):156-165
- CountryJapan
- Language:Japanese
-
Abstract:
In addition to the histological study of tendon blood circulation, high level of resting blood flows have been functionally observed in the in-vivo tendon tissue preparation. Interest has been directed to investigate the phenomenon from the measurement of tendon tissue Po2 changes which may indicate the activity of capillary blood flow. Simultaneous measurements were done in tendon synovial fluid, tendon and muscle tissues of the 15 rabbit hindlimbs, in conditions of hypoxia and hyperoxia. Continuous measurements of tissue Po2 were performed by polarographic method using a pair of the wire platinum electrode (80μm in diameter) with polymer membrane to the indifferent silver electrode. Average Po2 of tendon synovial fluid, tendon fiber and muscle tissues at rest (mean±SD, n) were 37.36±24.32 (10), 30.96±14.72 (10) and 19.54±8.05 (8), respectively. These data increased gradually to the maximal level of 45.46±27.46 (10), 39.23±16.23 (10) and 25.96±9.77 (8) after cutting of sciatic nerve. Reactive hyperemia-like Po2 increase immediately after release of femoral arterial occlusion was observed neither in tendon synovial fluid nor in tendon tissue. There was no significant difference between each other of tissues in the process of Po2 increase during oxygen intake and the decrease after cessation of oxygen flushing. During exercise, a marked decrease of Po2 was obtained in muscle, but not in tendon synovial fluid.
These data indicate that high level of Po2 in tendon and the surrounding tissuse may have some oxygen supply channels including segmental blood supply system with a short length of and/or a large size of capillary.
