Conceição, AnaCosta, Aldo MSilva, António JSobreiro, PedroLouro, Hugo2021-07-022022-07-012020-07Conceição A, Costa AM, Silva AJ, Sobreiro P, Louro H. Occlusion technique in swimming: a training method to improve exchange block time in swimming relays. J Sports Med Phys Fitness 2020;60:957-64. DOI: 10.23736/S0022-4707.20.10335-9http://hdl.handle.net/10400.15/3513Swimming relay events have the concern regarding a good start is shared between the incoming and outgoing swimmers. The aim of this study was to evaluate changes in exchange block time (eBT) for swimming relay events as a result of a four-week training program using the occlusion technique. MeThodS: Twenty-eight national swimmers, 12 males (age: 17±1.83 years) and 16 females (age: 19.94±5.65 years) participated in this study. Subjects were required to undergo a training program on visual perception in relay swimming over the course of four weeks; they watched videos corresponding to the last movements of a swimmer during a 4×100m freestyle relay event. The videos were presented with temporal occlusion corresponding to predetermined approaching distances (7.5 m, 5.0 m, and 2.5 m). Swimmers were required to simulate a typical position for exiting the block and to estimate the time-to-contact of the incoming swimmer. The eBT was collected during a real 4×100-m freestyle competition before and after the application of the training program. RESULTS: Female swimmers showed a decreased in EBT, with an improvement of 1.42%, despite there not being a signifcant difference (p=0.68). The male swimmers had a higher improvement in eBT after the training, with a decrease of 13.34% (p=0.68). coNcluSioNS: Visual perception practice using video occlusion techniques seems to have a positive effect. on eBT in swimming relay events, particularly in female swimmersengathletic performanceswimmingvisual perceptionathletesjournal article10.23736/S0022-4707.20.10335-91827-1928