Fig. 5: Evaluation of muscle morphology after a 6-week rehabilitation program.

a MRI images of quadriceps and hamstrings in both trained and untrained legs before and after training. b–e Quantitative cross-sectional area (CSA) before and after training. The red bar represents the quadriceps, while the blue bar represents the hamstring. The empty bars represent the CSA before training, while the diagonally hatched bars represent the CSA after training. b Quadriceps of trained leg. c Hamstrings of trained leg. d Quadriceps of untrained leg. e Hamstrings of untrained leg. f Increased CSA of quadriceps/hamstrings in the trained/untrained leg. Quadriceps: \({p}=3.03\times {10}^{-4}\). Hamstrings:\(\,p=6.88\times {10}^{-5}\). (Subjects: n = 10) The solid border represents the trained leg, while the dashed border represents the untrained leg. g Growth rate of quadriceps/hamstrings in the trained/untrained leg. The solid border represents the trained leg, while the dashed border represents the untrained leg. Quadriceps: \({p}=2.33\times {10}^{-4}\). Hamstrings:\(\,p=4.40\times {10}^{-6}\). (Subjects: n = 10) ACL anterior cruciate ligament, MCL medial collateral ligament, PD patellar dislocation. Data are presented as mean ± SD. *Refers to p-value < 0.05 by two-tail t-test. Source data are provided as a Source Data file.