Sure. In the Active Effects menu, with nothing on my character (no amulets,no armor, no rings etc.) there are only 4 effects : Resist Fire (cause i'm dark elf), Ancient Knowledge (you take it with a quest, it gives bonus to dwarven armor and faster xp in Smithing), The Warrior Stone and Talos Blessing. So nothing that concern stamina or its regeneration. For Georgiegril - I got something like 100 mods (65 for texture and graphic, the rest are mods that adds weapons, armor, houses, gameplay changes etc..). So probably this is an issue with a mod...