Originally Posted by russiarulez

Thank you for sharing your story.

I got my concussion from boxing and have been going through the same exact roller coaster where I would get better and better, but a smallest thing would send my symptoms spiraling out of control again.

Regarding the stationary bike - about a year ago (almost a year after my concussion) I started doing very light exercises on a stationary bike (tried treadmill first but I felt very crappy after it).

Started at elevating my resting heart rate by only a little bit (10-15 bpm) for 5 minutes - did this for about a week.
Then elevated my heart rate again by a little bit and increased the time to 7-8 mins, did that for over a week, and you can see the pattern.
I eventually got to about 150 bpm for 20 mins over the course of 3-4 months, then had a huge setback (not from exercise) and started all over again after not doing anything for about 2 months.
Whenever I have a setback, I always give myself time to get back to where I was, even if it means not excising for a month or two.

Just because you feel ok during the exercise, doesn't mean you should be pushing yourself. Many people of this board note that sometimes it hits them bad the next day or even two days after they exerted themselves. I definitely noticed that delayed response as well, and it makes this whole thing very tricky.