Biceps femoris and semitendinosus—teammates or competitors?

New insights into hamstring injury mechanisms in male football players: a muscle functional MRI study

The predominant mechanism for hamstring injury in football occurs during acceleration or high-speed running. Both the semitendinosus (ST) and biceps femoris (BF) engage in maximal eccentric activation during the swing phase of running. However, both muscles activate alternatingly in a complex neuromuscular coordination pattern, with the BF predominantly activated during middle-to-late swing, whilst the ST is the leading player in terminal swing. The following study assessed how the different hamstring muscle bellies work together synergistically, and whether changes in coordination are associated with injury.


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