As far as I understand it, the Alberts's approach to forced exercise depends on the cadence (rpm) more than the effort. So, you could pedal slowly in a high gear, or pedal quickly in a low gear with both methods requiring the same amount of work and both getting to the same speed. But, as far as PD is concerned there is some evidence that the high cadence approach is better.

I have no experience of forced exercise cycling, but last year I built a machine to give me forced exercise of the arms. My stiffness reduced. But, interestingly, like Mr Budgies my tremor worsened. I don't know whether there was a causal relationship.

Has Mr Budgies tried the simple tremor reduction technique described in a recent thread? It helps me slightly.

John