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A Change That I don't understand

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I am a swimmer, I'm 62 and I count carbs. 1 carb = 4units of insulin =50 units BS. Today I got to the gym with a blood sugar of 208 primarily because I backed off 4 units of insulin at lunch in anticipation of my afternoon swim. 30 minutes of vigorous continuous swimming typically reduces blood sugar by by at least 100 units depending on how hard I work. Today I finished my swim and my blood sugar had gone up to 350. This has actually happened a couple of times in the past couple of weeks. When I started I was about 1hr into my lunch bolus of novolin short term. I should have been at 70-100 when I finshed. Any ideas about what's going on?


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