Effects of heat stress on blood flow in respiratory and non-respiratory muscles in the sheep.

摘要: Conscious sheep were subjected to mild and severe heat stress, capillary blood flow in some respiratory non-respiratory skeletal muscles was measured using radioactive microspheres. In muscles, decreased during stress increased advanced stages of stress. This probably part an overall redistribution cardiac output required combat the Increased diaphragm, crus intercostal provides supporting evidence for a previous hypothesis that panting initial is primarily diaphragmatic whereas there significant thoracic component Assuming parallels metabolic rate, present studies indicate while rate increases perform work panting, effect on total body offset by decrease other tissues. Thus, estimates energy cost efficiency based measurements whole may be considered misleading having indicated requires little or no expenditure.