Not going to touch on the finer points of the atheltisim of the mice. As your right it would clearly alter the results.
But I do have a question.
What is the ratio of 30 minutes of exercise for a mouse compared to a human. As I would be highly surprised if its 1 to 1.
This article reinforces the need to listen to your body and react accordingly.
On a side note for those looking for ideas.
Based on the example in the article...
I would happily volunteer to take a saliva test before running and after. To help build up the data available for the test.
A website to cater for "crowd sourced data" scientific discovery would be an amazing site. ( clearly there would be pitfalls, im just throwing it out there )