PP,
I had a similar problem recently, although my heart rate wasn't quite that low. The doc had me do a bit of running on the spot for 30 sec and then re-checked. Apparently there is a dangerous condition where you can have a low heart rate that doesn't respond to the demands of activity.
The blood pressure is dystolic/systolic (hope I got them the right way around!). The high number is the maximum pressure of your pulse, and the low number is the pressure between heartbeats.
Keep rowing!
