calories burned for certain activities

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I know that this is just a tool to measure. ...

how are the calories burned for a competitive basketball game and a competitve volleyball game so similar?
I just feel like playing a full court game of basketball would burn way more calories then a volleyball game with the same amount of time.

How should I adjust this? I am completely drained after a game of full court basketball. After a game of volleyball I feel like I barely excersised.

thoughts?...