The union which represents ambulance crews in Peterborough has released a film showing the stresses staff face while at work.
UNISON has created the video in advance of a vote on strike action.
Members are being balloted for action over a lack of rest breaks and enforced overtime.
The ambulance trust was issued with a ballot notice for industrial action last week.
After the notice was sent UNISON says a planned meeting with the chief executive was cancelled by the trust at short notice.
UNISON has approached the arbitration service ACAS for assistance and will start discussions with the ambulance trust today in an attempt to resolve the dispute.
The union is also urging the public to show their support for local ambulance crews by signing an e-petition www.putbacktheheart.com/epetition