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I had something similar when my marathon training ramped up and went to the physio. The diagnosis was weak calves! Basically my calves weren't strong enough to handle the load. Some dry needling and a course of calf raises sorted me out. Not sure if you're the same but I'd always er on the side of caution and see a physio. Also - the carbon shoes generally put you more up on your toes and put more load on your calves.
Building up to Dublin marathon on 29th October, had a 32km session yesterday made up of 20 min warm up, (20 min marathon pace, 5 min easy, 3x6min threshold pace with 5 min easy between each effort)x2, 20 min cool down, hilly course, average pace 4:52min/km. Felt comfortable throughout, and only in the last 3km or so did everything start to feel uncomfortable, but not to the point that I couldn’t continue. First time running more than 25km so I guess it’s normal enough. First time in carbon race shoes too (metaspeed sky+).
From the moment I stopped running though I’ve had an unusual discomfort in my left lower leg. It’s a dull pain in my calf and maybe ankle, but mostly calf and mainly when I rotate my foot inwards, but also when I try to do a calf raise/stand on tiptoes. It almost feels like I’m weak/lacking stability on my left leg. It’s not shin splints, had a dose of that earlier this year and this is different. Does it sound familiar? Any speculation on what it could be?