It's just my opinion, but my experience has been that company policy setters absolutely hate to reverse a decision based on employee input - it makes them feel like you were right and they were wrong.
For effectiveness, your best bet (again IMO) would be contacting a doctor in whatever HMO, PPO, POO-POO, etc., the company uses to try and get some written acknowledgment that PVs are a good thing; then take that to whomever you're dealing with.
Every situation is different. I've just found that when asking something of corporate decisionmakers, if they've said "no", your saying "but" just makes them dig in and defend their decision. Getting the approval of a company-approved health professional lets them feel like heroes for changing the policy to benefit the health of the employees.
For effectiveness, your best bet (again IMO) would be contacting a doctor in whatever HMO, PPO, POO-POO, etc., the company uses to try and get some written acknowledgment that PVs are a good thing; then take that to whomever you're dealing with.
Every situation is different. I've just found that when asking something of corporate decisionmakers, if they've said "no", your saying "but" just makes them dig in and defend their decision. Getting the approval of a company-approved health professional lets them feel like heroes for changing the policy to benefit the health of the employees.