cold legs muscles?

[skinnypete05r]

hey all, when im on my exercise bike the back of my legs occasionally get a cold feeling in them? im not exercising in a cold room or outside.
any thoughts would be great, thanks
tom

 

[Quill_Gordon]

I experience something similar when swimming. Does this happen after any particular duration of work or intensity of work?
QC

 

[manio]

When I trained in MTBing I sometimes experienced the same feeling, though I don't know why it happens.

 

[skinnypete05r]

Starts up about 2/3 mins after starting, no idea why though :S sometimes it goes away sometimes it does, bit hit and miss really