his tremors could be worse simply due to physical exertion tiring the muscles and leaving him out of breath. It is tough to know as we don't know his age or state of health or general fitness level.

I do know that exercise is claimed to be only good for Parkinson's and I feel my exercise program has helped.

I would stick at the cycling and as he gets fitter the tremors may become less, (assuming he was relatively unfit, which may be a wrong assumption).

Trixiedee, as for the original query, I remember a thread about a year ago which defined a number of Parky profiles and there response characteristics. See the link below, it may be of some help.

http://neurotalk.psychcentral.com/thread101685.html

Neil.