I am a diabetic who exercises every day, for about 1 hour. why is my blood glucose high after exercise? it is around 160 to 180.

Not unuual: If blood sugar at 100 to 250 mg/dl (5.6 to 13.9 mmol/l). For most people, this is a safe pre-exercise blood sugar range. Exercise makes muscles need more energy to perform. Without any food prior to exercise sugar in the form of lactose is secreted by the muscle. If this sugar is not used up during exercise, the sugar is still in the blood for hour or so after exercise.

Exercise in afternoo: Sometimes exercising in the morning can raise sugars in diabetics because of an increase in hormones in the morning that raise sugars. Exercising in the afternoon or evening will almost always lower sugars. Of course, if you eat before exercising, the rise in sugar from eating is greater than the burning of sugar with exercise, so sugars will be higher.