Unilateral resistance training (RT) has been shown to induce contralateral strength improvements in the untrained homologous muscle. Notably, low-load blood flow restriction (BFR) RT has shown superior increases in muscle strength and hypertrophy compared to low-load non-BFR RT. Previous literature has also reported that BFR RT has systemic cross-transfer effects of strength on other active skeletal muscles compared to low-load non-BFR RT. PURPOSE: Therefore, the purpose was to examine the cross-transfer effects of 4 weeks of unilateral BFR dorsiflexion RT on muscle strength, hypertrophy, and muscle quality. METHODS: Fourteen untrained participants were randomized into two groups: (BFR; n=8) (177.6 ± 4.1 cm, 84.8 ± 15.1 kg, 21.3 ± 1 years) or control (non-BFR; n=6) (173.2 ± 7.5 cm, 77.9 ± 10.3 kg, 23 ± 2.6 years). Subjects completed 4 weeks (8 sessions) of unilateral isokinetic dorsiflexion RT at 30% of their daily peak torque at a velocity of 60°/s. Isokinetic peak torque, echo intensity (EI), and muscle cross-sectional area (mCSA) were taken bilaterally pre and post RT. Statistical analyses included 3 separate 3-way mixed factorial ANOVAs (Group [BFR, non-BFR] x Time [pre, post] x Leg [right, left]). RESULTS: For isokinetic strength, there were no significant interactions or main effects (p>.05). For EI, there were no significant interactions (p>.05); however, when collapsed across time and leg, there was a significant main effect for group (p=.017; BFR (91.7 ± 1.6 vs. non-BFR (84.8 ± 1.9); mean ± SE). Furthermore, there was no significant interaction for mCSA (p>.05), but there was a significant main effect for time (p



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