Effects of Static Stretching and Self-myofascial Release on the Muscular Frequency, Stiffness, Decrement of Single, Multi-joint Hip Flexor

Purpose: The study aimed to identify the effect of static stretching and self-myofascial release on the muscular frequency, stiffness, and decrement of the single and multi-joint hip flexor.Methods: Thirty young adults volunteered to participate and were randomly assigned to one of two groups (SS; static stretching, SMFR; self-myofascial release).The properties of the iliopsoas muscle for single joint and rectus femoris for multi-joint of the hip during static stretching and self-myofascial release were measured by Myoton PRO (Myoton AS, Tallinn, Estonia).Statistical analysis used an independent t-test to determine the effect of static stretching and self-myofascial release on the muscular frequency, stiffness, and decrement of the single-and multi-joint hip flexor.The level of statistical significance was set at =0.05. Results:The comparison of muscular properties revealed that muscle stiffness and muscle decrement of the rectus femoris in the SMFR group were significantly lower than those in the SS (p<0.05). Conclusion:It was concluded that SMFR is more effective in enhancing muscle elongation when applied to multi-joint muscles (e.g., rectus femoris) compared to single-joint muscles (e.g., iliopsoas).