Agree with OL. Oregon is what is referred to as a "state-plan" state. They opted to run their own worker safety program instead of letting Federal OSHA run it. Their safety rules have to be at least equal to OSHA's and must be approved by OSHA. OSHA only has a requirement for annual rescue training so if Oregon does in fact require twice a year that is a rule specific to Oregon only and is not an OSHA rule.
I also agree with the idea that overweight/out of shape linemen should not be forced to perform poletop rescue for possible health reasons. But keep this in mind; OSHA has written several letters of interpretation on this subject over the years and they clearly state that OSHA considers being able to properly perform a rescue to be a "critical" job skill. As such, if you have not performed a rescue within the past year (we certainly hope not) then you must be retrained and demonstrate proficiency in order to be considered qualified to perform your job. If you have not / cannot perform poletop rescue in the past year then you are no longer considered qualified and as OL pointed out you cannot be the second man on a crew where climbing is involved. Personally, I would refuse to work with a second person who has not demonstrated that they could perform a proper rescue if it would become necessary.