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Altered quadriceps activation is common following anterior cruciate ligament reconstruction (ACLR), and can persist for years after surgery. These neural deficits are partially due to chronic central nervous system alterations. Transcranial direct current stimulation (tDCS) is a non-invasive modality that is believed to immediately increase motor neuron activity by stimulating the primary motor cortex, making it a promising modality to use during ACLR rehabilitation. The aim of this study was to determine if a single treatment of tDCS would result in increased quadriceps activity and decrease levels of self-reported pain and function during exercise. Randomized crossover design. Controlled laboratory setting. 10-participants with a history of ACLR (5 male/5 female, 22.9±4.23 yrs, 176.57±12.01 cm, 80.87±16.86 kg, 68.1±39.37 months since ACLR). Active tDCS and …