Avtor/Urednik | Golja, Petra; Mekjavić, Igor B | |
Naslov | Učinek hipoksije na prekrvljenost kože pri človeku | |
Prevedeni naslov | The effect of hypoxia on skin blood flow in humans | |
Tip | članek | |
Vir | Med Razgl | |
Vol. in št. | Letnik 41, št. 2-3 | |
Leto izdaje | 2002 | |
Obseg | str. 169-71 | |
Jezik | slo | |
Abstrakt | Anecdotal evidence suggests that high altitude increases proneness to cold injury. Since local skin blood flow is the major determinant of the occurrence of cold injury, any non-thermal factor which enhances vasoconstriction could also increase proneness to cold injury. This research examined whether hypoxia is such a factor. Skin blood flow was monitored indirectly by measuring skin temperature and using infrared thermography. Several environmental temperatures (10 degrees, 24 degrees, 28 degrees and 35 degrees C) and four different altitudes (0, 4000, 5600 in 6300 m) were simulated in the experiment. High altitude was simulated by breathing hypoxic gas mixtures containing known amounts of oxygen. The results of the study indicate that environmental temperature overrides the local vasoconstrictive effects of hypoxia in the skin in cold and warm environment. Hypoxia produces vasoconstriction in the skin in thermoneutral environments, however this effect is small and transient. It was concluded that hypoxia does not locally increase proneness to cold injury, since it does not enhance cold-induced vasoconstriction in cold environment | |
Izvleček | Nekatera opažanja nakazujejo, da je izpostavljenost poškodbam zaradi mraza večja na večji nadmorski višini. Ker je za nastanek poškodb zaradi mraza ključen pretok krvi skozi tkivo, bi lahko dejavnik, ki bi lokalno pospešil ali ojačal vazokonstrikcijo, povečal izpostavljenost poškodbam zaradi mraza. V raziskavi smo skušali ugotoviti, ali in kako hipoksija vpliva na prekrvljenost kože. Koža kot mejna plast je namreč organ z največjim tveganjem za poškodbe zaradi mraza. Pretok krvi skozi kožo smo spremljali posredno z merjenjem temperature kože in infrardečo termografijo. Uporabili smo različne temperature okolja (10 stopinj, 24 stopinj, 28 stopinj in 35 stopinj C) in različne nadmorske višine (0, 4000, 5600 in 6300 metrov). Višinsko okolje smo posnemali z dihanjem plinskih mešanic z različno vsebnostjo kisika. Rezultati raziskave kažejo, da v koži temperatura okolja prevlada nad lokalnimi vazokonstrikcijskimi učinki hipoksije v hladnem ali toplem okolju. V koži hipoksija sicer sproži vazokonstrikcijo v termonevtralnem okolju, vendar je učinek majhen in prehodnega značaja. Sklepamo, da hipoksija lokalno ne more povečati izpostavljenosti poškodbam zaradi mraza, saj v hladnem okolju ne ojača z mrazom izzvane vazokonstrikcije. | |
Deskriptorji | ANOXIA SKIN COLD SKIN TEMPERATURE ADULT THERMOGRAPHY |