1. Seiler is definitely based on sessions. He looked at a lot of historical training data and this was the best they could do. When we move to time in zone, I think the total time of the days devoted to base specific intensity ought to be closer to 70 to 75% per week, depending on the training strategy. These numbers typically do not incorporate well with Block Periodization where you may be either 90% base or 40% base on the weekly view. Looking at it per training cycle is likely more accurate.
2. Each specific ride does not and should not follow any sort of Low to High Intensity split as it would not lead to enough stress to induce adaptation (see below). In a perfect training world, rides should be focused on either Base or Intensity.
3. Personally, I think your ride was fine. This is part of having fun while riding. I bet it was a great day, despite it not being perfect for training.
Two things to consider
1. I would have pushed a little harder to avoid Z3. If you need to go harder than base, you might as well to go low Z4.
2. Now that you had your fun ride, if you want to maximize your base week, then try to be really good about adhering to Z2 for the rest of the week. (This is assuming you're doing Block Periodization). If not, just count this time toward your weekly allotment of Z4/5 and call it good.
3. I don't like recovery per TSS. In concept and on paper it makes sense. However, there is so many more factors. Were you underfueled? Then you'll have a higher cortisol release. Did you do anything to improve recovery, Massage, Protein, etc.?
General Thoughts:
Adaptation:
The point of "training" is to get better, otherwise you might as well ride for the sake of having fun.
To get better you need to adapt and to adapt you need to have a reason (stimulus) to get better.
To get better, you need to make improvements that are induced by that stimulus AND they need to be the right improvements.
You need both of these.
Workouts = Stimulus
Recovery = The time to rebuild.
Stimulus:
The work that we do is the signal for change. If you always do the same work, or you always do work that doesn't challenge you then there is a weak signal for change. You do not get better. This is with everything in life.
This is also why studies that show the largest improvement for HIIT training are in non-athletic populations. The athletic people already do things like this, so it doesn't help them much. I can show studies that support / disprove the HIIT theory just based on the subjects they recruited.
Most riders need to get their signal in the correct direction: Fix their training intensities and workout focus. This often leads to immediate improvements.
Riders that are training well can either mix up their training and something different, potentially aiming their stimulus off-target (e.g. "Muscle confusion" (which is perhaps good for weight training, but not endurance training), OR they can make the signal bigger by going longer or harder.
Going harder, however, is still relative to your fitness. If 5x5 minutes at 120% of threshold is a good workout, it does not mean that 5x5 minutes at 130% is better... because you probably can't do that. It means that if your threshold is 300w, then 5x5minutes at 360 is perfect. And when you improve, 360 won't be enough anymore. You now need to do 5x5minutes at 120% of your new threshold of 315w. So, bump those intervals up to 378w.
Same for base training: If 70% of threshold is great for 2 hours of base, it is not better to go 2 hours at 75%. This might be harder, but you're changing the aim of the stimulus, so you are not going to get the adaptation you need. Instead, as you get better, continue doing 70% of threshold for base rides, but know that it'll now take 3 hours to have the same signal that 2 hours use to have.
This also applies to the individual workout session:
Option 1: Ride 5 minutes at Z5 for each ride for 5 rides, Ride base for the other 55 minutes. (This is 5x5 minutes at Z5 per week)
Option 2: Ride 4 days of 60 minutes of base, Ride 1 day with 5x5 minute Z5 intervals (This is still 5x5 minutes per week)
Option 2 is far better than Option 1, because a single bout of 5 minutes at Z5 is not challenging to your body. It won't be a large enough signal to change.
However, if you do them all at once, you may feel fresh on the 1st and 2nd, but by the 5th Z5 effort you are spent. This is a big signal to change.
This is why Block Periodization can be Effective. It creates a very strong stimulus for change in a moderate amount of time.
However, the downside to Block Periodization is that each individual session can really only be 85% of your potential, because if you gave 100% each day you couldn't finish the week. You trade a little bit of signal each day to have that signal compound day over day.
(This is like skiing, A 20" dump overnight is real fun, but 5 days of 4" makes for a great week).
This is also why I switch back to a traditional plan as events get closer. This way I can dig really deep in the individual sessions, just like you do in an event, without having to save some for tomorrow's workout.
E.g. One Ride with 5 sets of 5 minutes at VO2 is a larger signal for adaptation than