What does this research mean for the field?

In amateur male soccer players, hamstring muscle fiber typology has no distinct dominance and is not associated with hamstring strain injury history or overall functional performance, despite a correlation with explosive strength capacity. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

January 1, 2023Open Access

Hamstring muscle fibre typology is not associated with hamstring strain injury history or performance in amateur male soccer players: a retrospective magnetic resonance spectroscopy study

Structured PICO

Does hamstring muscle fibre typology associate with hamstring strain injury history or performance in amateur male soccer players?

Population

44 male amateur soccer players in Belgium, aged 18-35 years, including 22 with a recent history of non-contact soccer-related hamstring strain injury (HSIH) and 22 matched controls without HSIH.

Intervention

Non-invasive fibre composition evaluation using proton magnetic resonance spectroscopy (1H-MRS) to measure hamstring carnosine concentration.

Comparator

Comparison between players with and without a history of hamstring strain injury.

Outcome

Difference in relative Semitendinosus (SemiT) carnosine contents between groups (HSI history versus matched controls).surrogate

Hamstring muscle fibre typology, estimated by carnosine concentration, is highly variable and does not associate with hamstring strain injury history or functional performance in amateur male soccer players.

Abstract

H-MRS), functional performance (evaluated by means of maximal jumping height, maximal sprinting speed and hamstring muscle strength endurance (single leg hamstring bridge testing)), and isokinetic strength testing. The results revealed that hamstring carnosine concentration demonstrated a high inter-individual variability within this soccer population and was not significantly associated with either HSIH or with any of the functional performance parameters. The only secondary outcome measure presenting a significant association with the intramuscular carnosine content was the hamstrings' explosive strength production capacity, objectified by means of the time to peak torque (TPT), measured concentrically at an angular velocity of 240 degrees/second (°/s) during isokinetic strength testing. This TPT was significantly shorter in players presenting higher carnosine concentrations (p = 0.044). The findings indicate that in male amateur soccer players (1) the hamstrings have no distinct fibre type dominance and (2) fibre typology in this population does not relate to HSIH or performance.

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