hypoxia
METHODS: Sprague-Dawley (SD) rats were pretreated with or without RCE and then exposed to a simulated altitude of 8000  m in a hypobaric hypoxia chamber for 9  h. The expression of cardiac arginase 1 (Arg-1) and endothelial nitric oxide synthase (eNOS) and the activity of associated signaling pathways was examined.