When you use the Pool-MateHR you need to record your cool-down surface swim otherwise it doesn't log the session. A freedive can be tracked as a set (although standard swim data won't be available, only heart rate), the pause function used for recovery and while taking equipment off. I then record at least one more set of surface swimming for cool-down.
Other swim plots have shown some heart rate blips at the wall turns, and a high starting heart rate. Both of these insights give me aspects of my dive to work on to stay relaxed so as to smooth out the heart rate profile and get the most efficient swim I can.
In cross-training the Pool-MateHR has shown over the last 3 months that my front crawl technique is improving, which is great news as I do a lot of open water swimming in the summer. I also discovered that the most efficient breathing and stroke for me is actually bilateral every 5 strokes rather than 3. But when I do reduced breathing sets to every 7 strokes then I start to struggle!
Here's a typical view using the Pool-Mate programme. The swim sets in white contain efficiency and stroke data; in between I do monofin technique drills where just the heart rate is recorded (in pink). Spot the drill sets where I held my breath...?
For more details on the Pool-MateHR go to www.swimovate.com