come on. i can see going zone 3 for a few hundred yards on occasion…but in the case of someone like OP they would change their schedule if they were running in Zone 3 for a mile 4x a day.
so yeah if you run 4 miles in Zone 3, it’ll affect your cycling intervals.
Thanks very much for all of the replies.
I tend to walk those 4 miles every day, except for when I’m at home one day at work and then I get to walk my dogs for approximately 2 miles that day. So I’m used to walking every day.
I’m not going to put a zone on in it but it’s reasonably brisk, always the attraction of trying to catch the next available train. I also have to carry a heavyish rucksack with a laptop and charger and other bits.
It certainly affects the amount I can sleep, up at 5am and then home by 6pm. Maybe that’s having a cumulative effect? And the 4 miles is an extra straw.
There’s always the option to HTFU, but I just wondered if it affected training if I swapped the days. So one week the intense day was a Tuesday, the next week might be a Thursday.
Thanks again.
It’s almost certainly the early start and the long day. Like you I’m only in the office one day a week, but even with only having to get up at 6am and being home by 5pm I was finding that I was too tired to fit in a hard interval session (IF >0.85)
I switched my plan around to do an easy session on my office day and did the hard session on working from home or weekend day. I make sure that the day before an intense session the workout is easy, which for me is <30 TSS IF <0.68.
I wouldn’t expect 4 miles a day walking would impact your workouts. You are after all talking a short daily distance. Besides walking is good for your overall health as you age. I would look at other things going on in your life for a cause.
I would suppose that just like ny other stimulus, the body adapts to your daily walking and establishes a new “baseline” level of activity. Since you walk 4 miles every day, I don’t think it affects your workouts. If you doubled it, you would feel the effects for a while, and then your body adapts.
An extreme example of this would be myself. I walk an average of 15 miles a day with my dog, but I’ve done it every day for so long that is has no perceivable impact on my training or recovery. Obviously, it does affect my recovery to some extent, and if I were a professional athlete I’d likely benefit from less activity, but I’m not, and walking my dog is our way of spending time together. As long as I make up for the caloric demand of the high activity level I maintain, it doesn’t impact my training.
If you’re not getting paid a lot of money to race your bike, you should be more worried about how cycling might be affecting your walking than the other way around 
That being said, there is the old adage, “never stand when you can sit and never sit when you can lay down.” Any time on your feet during the day is going to possibly affect your cycling performance later. But, for non-pros, cycling is a nice bonus activity, but walking is fundamental to being human. Probably best not to totally ignore walking. Take advantage of your situation, keep walking in Just log it and count it as exercise.
Again, thanks for the replies.
I’ve definitely heard of the ‘don’t stand when you can sit’ and I’m sure my wife would say I follow that pretty well already 
And I will certainly make sure I try to value my time walking more as an all round healthy activity (rather than just a time to listen to a podcast). I try and record my activities and wasn’t there an announcement that TR was going to start taking this into account. Won’t be long befor it all joins up so my sleep tracker and my unanswered emails will contribute to the type of ride TR will schedule for me.
I’ll bear in mind that, for me, I’ll keep an eye on trying to schedule an intense day with working from home.
But of course, your mileage may vary