Speeding up or slowing down, Speaking aggressively , Checking your inflection , Talking more loudly or quietly
Discerning is the answer to your question.
The best way is to just relax and try to act naturally. Just be calm and try to make it a bit funny to hide fear. :)
True. Because the calorie calculation is based on how exclusively the heart rate is. Which the device runs through the algorithm.
Hope this helps :)