marginally significantp = 0.0512
The LMM (Linear Mixed Model) analysis revealed a marginally significant positive slope for Young’s modulus ( p = 0.0512) and a significant intercept ( p = 0.0016); for Maximum Stress, a negative slope ( p = 0.0346) and significant intercept ( p < 0.0001); while Maximum Stretch showed a significant negative slope ( p = 0.0007) and intercept ( p < 0.0001), indicating the muscle reduces compliance and load-bearing capacity with age.