Sorry as I am sure this has cropped up before. I have been training fairly intensively on a fixed wheel, 4 times a week for the last 2 months. I go out and do a solid 3 hours, no breaks, at an average of 90% of LTHR. I have noticed latterly a very strong smell of ammonia from the back of my shirt where I sweat most. I have been used to riding the sort of distances (and substantially more) that I am doing presently without this smell. I understand that it can be caused by protein breakdown but do not see why it should be occuring now. Any ideas gratefully received