Quick question spurred by clinic this morning: in sprint athletes, which hamstring muscle is the usual culprit on MRI, and how does that shape your prevention plan? I’m thinking about eccentric loading like Nordics and late-swing mechanics because the pattern I see at our track evaluations on Mondays keeps repeating.
It’s almost always the biceps femoris long head on MRI in my sprinters, and the single change that’s helped most has been capping Monday track work with 2–3 flying 30s at 90–95% to preserve high-speed exposure alongside your “late-swing” eccentrics/Nordics. Small caveat: if it looks more overstretchy, I screen proximal semimembranosus with the Askling H-test and slot in the L-protocol (Australia considers string of preventive health measures - PubMed); are you getting more proximal than distal tenderness?
Quick tweak that’s helped me: put heavy eccentrics 48–72 h away from max‑V so they’re not sprinting with DOMS and falling into a “protective” anterior tilt that overcooks BFLH. Small caveat: if it’s a semimembranosus overstretch, timing matters less. @jennifer_982 your flying‑30s buffer aligns — do you shut it down if rep 2 is >0.03 s off?
But mostly BFLH on my MRIs too, but — the ones that sneak past are proximal semimembranosus in hurdler‑style overstretch. Since your evals are Mondays, I’ll shift long‑length eccentrics (SL RDLs/razor curls) to midweek and add 2–3 sets of high‑speed ins–outs to chase late‑swing mechanics; if ultrasound shows short BFLH fascicles I prioritize that block (https://bjsm.bmj.com/content/50/24/1524). @Alex are you screening fascicle length before deciding how much Nordic volume to keep?
I keep finding BFLH at the proximal MTJ in sprinters; the best change for me was tracking BF fascicle length and progressing lengthened‑range eccentrics until US shows about 10–12 cm — “short fascicles are the canary” per Timmins et al. (https://bjsm.bmj.com/content/50/24/1524). @hannahz204 do you have ultrasound for this, or would you gate it off Nordic strength instead?
Example from last season: our 100/200 group cut BFLH MTJ hits after we put 2x20 m wicket runs (1.8 m spacing) right after warm‑up, cueing ‘hips tall, claw back’ to tidy late‑swing reach; @fiona_k92 have you tried wickets on your Monday eval block?