I did a lot of training this winter on my indoor bike with power meter. I also used a heart rate belt. When I did a outdoor ride to my office in this time, I got a training load of about 50. Like this:
Then I had some weeks without (or just little) riding. This week, I began riding to the office again, but for the same time, distance and effort I get just half the load now. Like this:
Can someone explain what happened there?