Key result
Prior biceps femoris strain does not alter running-induced T2 changes compared to uninjured limbs.
Why the study?
The study examined the spatial patterns of hamstring and gluteal muscle activation during high-speed overground running in limbs with and without a prior hamstring strain injury.
Does prior BFLH strain injury alter hamstring and gluteal muscle activation during high-speed overground running in active males?
Cross-Sectional (n=10)
Does prior BFLH strain injury alter hamstring and gluteal muscle activation during high-speed overground running in active males?
p-value: p=0.949
Athletes with prior BFLH strain injury display altered, highly variable intramuscular hamstring activation when sprinting, which may have implications for return to sport.
May inform individualized rehab after hamstring injury; leaves open whether activation patterns predict reinjury risk.
This study examined the spatial patterns of hamstring and gluteal muscle activation during high-speed overground running in limbs with and without aprior hamstring strain injury. Ten active males with arecent (<18 month) unilateral biceps femoris long head (BFLH) strain injury underwent functional magnetic resonance imaging before and immediately after arepeat-sprint running protocol. Transverse relaxation (T2) time, an index of muscle activation, of the BFLH and short head (BFSH), semitendinosus (ST), semimembranosus (SM), gluteus maximus (GMAX) and medius (GMED) was assessed pre-post exercise. No significant between-limb differences in running-induced mean T2 changes were observed (p = 0.949), however, decision tree induction revealed that previously injured limbs were characterised by highly variable intramuscular activation of the ST (SD5.3). T2 times increased more for GMAX than all other muscles (all p< 0.001, d= 0.5–2.5). Further, T2 changes were greater for ST than BFSH, SM, GMED, and BFLH (all p≤ 0.001, d= 0.5–2.9); and were greater for BFLH than BFSH, SM, and GMED (all p< 0.001, d= 1.2–1.6). Athletes display heterogenous patterns of posterior thigh activation when sprinting (GMAX>ST>BFLH>GMED>SM>BFSH) and may exhibit altered intramuscular hamstring activation after returning to sport from BFLH strain injury.
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Bourne et al. (2021) conducted a cross-sectional in unilateral biceps femoris long head (BFLH) strain injury (n=10). prior unilateral biceps femoris long head (BFLH) strain injury vs. uninjured limb was evaluated on running-induced mean T2 changes (p=0.949). Prior unilateral biceps femoris long head strain injury did not significantly alter running-induced mean T2 changes between limbs (p=0.949), though injured limbs showed variable ST activation.
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