3911Kj...the amount of work done... measured by the power meter (not what the body has actually burnt...but is a much more accurate way of telling how much energy you have used compared to the guesstimate of a heart rate device ).But basically,3911Kj is close enough to 3900 Kcal if you are watching your waist line.
253w av...the actual average watts for the duration of your ride.Some power meter recording devices allow you to ignore the none pedaling times in your average.That is left up to you to decide.Similar to a speedo set to just record the time you are actually rolling...not sitting at the lights.
286w NP...Normalized Power,an estimation of the power you could of maintained for the same "physical cost" if you effort had been constant...basically if you had ridden a constant TT instead of having many accelerations and soft pedalling moments.A good way to know what say a hard race "would" have averaged (cost you phsyically) if you had ridden steadily though out.Not of much use under 20 minutes...really a good indicator for hour long efforts etc.
IF...793 The ratio of Normalized Power to a riders FTP.
So then we must mention FTP (Functional Threshold Power)...basically your maximum hour power...what you could sustain in a best effort for an hour or close to.Like a 40km TT for example.Probably the most important number for an endurance cyclist....and the number you are always striving to improve as it basically affects all other areas.
Aerobic Decoupling 2.36%
I have no idea