Asymmetry between legs in external mechanical load is possible during rugby league match-play, however, it tends to only be in negative or very high intensity accelerations. The primary cause of external mechanical loading on rugby league players during match-play is foot-ground impacts. External mechanical load is the mechanical force an athlete exerts into the ground and the reciprocated exertion on the skeletal system. Accelerometry provides a surrogate method for measuring external mechanical load in field settings. However, accelerometry has not previously been used to assess how mechanical load differs across playing positions and limbs during match-play.
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