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RSP comparison with respect to target muscle union. Significant inter-group differences based on target muscle union are indicated by “*” (p < 0.05, independent t-test). No significant intra-group difference between four muscle unions in each group (p > 0.05, two-way mixed ANOVA). Significant intra-group differences between arms in each group are indicated by “#” (p < 0.05, independent t-test).
