Calorie burn and steps are completely independent. Calories burned are a function of your heart rate. The question would be what was your heart rate when you were shaking you wrist. I suggest you try the same experiment two times: first when you are seated and rested; then again right after you have been exercising and you heart rate is elevated, but both times when you are not taking any steps. But I expect you will also note the calories increase only on the full minute.
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