## 3. Results  
The participants of this study were a total of 24. There were nine males and three females in the CONG, 28.8 \(\pm\) 10.3 years, height 171.1 \(\pm\) 7.7 cm, and body weight 71.5 \(\pm\) 13.6 kg. The EMSG were ten males and two females, 30.4 \(\pm\) 13.0 years, height 173.3 \(\pm\) 8.0 cm, and body weight 74.7 \(\pm\) 12.9 kg. All participants were 29.6 \(\pm\) 11.5 years, height 172.2 \(\pm\) 7.8 cm and body weight 73.1 \(\pm\) 13.0 kg.  
Figure 4 shows the Lysholm and IKDC scores. The Lysholm score (\(p\) = 0.018, \(\eta^{2}\) = 0.228) and the IKDC score (\(p\) = 0.011, \(\eta^{2}\) = 0.258) both showed a major impact over time, despite the absence of a significant interaction. After ACL surgery, the post hoc analysis revealed that exercise rehabilitation significantly increased the Lysholm score (\(p\) = 0.049) in the EMSG and the IKDC score (\(p\) = 0.026) in the CONG in each group.  
On the basis of Figure 6, there was an interaction in the muscle activity of VM during isokinetic contraction (\(p\) = 0.028, \(\eta^{2}\) = 0.202). Moreover, there was a significant main effect with time in the muscle activity of the VL (\(p\) = 0.004, \(\eta^{2}\) = 0.316), RF (\(p\) = 0.026, \(\eta^{2}\) = 0.207), and VM (\(p\) = 0.010, \(\eta^{2}\) = 0.268), respectively, during isometric contraction and isokinetic contraction. In the EMSG, post hoc analysis showed that the muscle activity was substantially greater in the VM during isokinetic contraction (\(p\) = 0.001) and in the VL (\(p\) = 0.015) and RF (\(p\) = 0.015) during isometric contraction, respectively.  
The findings of the thigh circumference are displayed in Figure 5. In the 5 cm circumference, the main effect of time was demonstrated (\(p\) = 0.049, \(\eta^{2}\) = 0.162), while at the 15 cm circumference, interactions were demonstrated (\(p\) = 0.010, \(\eta^{2}\) = 0.268). Post-analysis revealed that the circumference of the EMSG increased significantly at 5 cm (\(p\) = 0.001) and 15 cm (\(p\) = 0.013).  
Figure 4: The rehabilitative exercise programs’ effects on Lysholm score and IKDC score. (**A**) Compared in Lysholm score. (**B**) Compared in IKDC score. control group; CONG, electro muscle stimulation group; EMSG, International Knee Documentation Committee; IKDC. # \(p\) < 0.05: main effect or interaction; * \(p\) < 0.05: pre- and post-test.  
Figure 5: The rehabilitative exercise programs’ effects on circumference at 5 cm and 15 cm. (**A**) Compared in 5 cm circumference. (**B**) Compared in 15 cm circumference. control group; CONG electro muscle stimulation group; EMSG. # \(p\) < 0.05: main effect or interaction; * \(p\) < 0.05: pre- and post-test.  
Figure 6: The rehabilitative exercise programs’ effects on muscle activity of VM, VL, and RF during isometric and isokinetic contraction. (**A**) Compared in VM during isometric contraction. (**B**) Compared in VL during isometric contraction. (**C**) Compared in RF during isometric contraction. (**D**) Compared in VM during isokinetic contraction. (**E**) Compared in VL during isokinetic contraction. (**F**) Compared in RF during isokinetic contraction. control group; CONG, electro muscle stimulation group; EMSG, vastus medialis; VM, vastus lateralis; VL, rectus femoris; RF. # \(p\) < 0.05: main effect or interaction; *_p_ < 0.05: pre- and post-test.  
In the quadriceps muscle peak torque, there was a significant interaction (\(p\) = 0.012, \(\eta^{2}\) = 0.253). The quadriceps femoris muscle's peak torque and total work both showed a significant main impact that varied with time (\(p\) = 0.001, \(\eta^{2}\) = 0.405 and \(p\) = 0.008, \(\eta^{2}\) = 0.280, respectively). The PT (\(p\) = 0.002) and TW (\(p\) = 0.019) in EMSG both significantly increased, according to post hoc analysis (Figure 7).