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Both internal and external load measures are necessary to provide an accurate perception of the impact of training stimuli on players. © Georg Thieme Verlag KG Stuttgart · New York.The purpose of this study was to establish the relationships between 50 m sprint swimming performance and variables acquired from a swimming load-velocity profile established by semi-tethered butterfly swimming. Twelve male elite swimmers participated in the present study and performed 50 m sprint and semi-tethered butterfly swimming with d