I am finding that after the 10 second all out hill sprints workout in the big vert plan my legs feel really tired and heavy the next day.

I am pretty sure I am slow twitch dominant (both from experience – i am NOT a sprinter at all) and from genetics.

The first time I thought it could be the weather suddenly getting much hotter but it has now been 3 weeks of trying to do my normal long Saturday run and finding that my legs feel really super heavy but not sore at all.

Based on the workout commentary and people’s comments I was expecting the workout to feel super easy because I haven’t done hardly any sprinting before (and I read that people who haven’t won’t engage the FT muscles and therefore it will feel like it’s too easy) I actually find it fine. Not super easy but not super hard. At the end my legs feel a bit tired but not at all sore.

My presumption is that it is glycogen depletion. I have tried to be a bit more aggressive about refueling after the last 2 sessions although I still didn’t notice much difference the next day. My guess is I’m just still not refueling enough but wondered if anyone else had found the same.

I also find that by Sunday (2 days after) they are generally feeling better (although after feeling heavy on Saturday I have generally been making a concerted effort to add more carbs during the day) and the rest of the week is pretty fine.

Am I right to assume that these 10second all out hill sprints could seriously deplete muscle glycogen or could it be the neuromuscular fatigue as well?

For more background I don’t have ADS (~7% between AeT and AnT and my fat adaption is pretty good. I do the hill sprints on a 37% rocky hill. I do do my Saturday run fasted but have done fasted runs like that for a long time and not seen an issue. Very noticable difference after starting hill sprints the day before.

Interested in any thoughts/experiences.

Thanks!