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Immediate Effects of Warm-Up Protocols, Including Dynamic Stretching on Explosive Strength of Knee Extensors

  • Jeongwoo Jeon (Digital Healthcare Institute, College of Health Sciences, Sunmoon University)
  • 투고 : 2024.09.20
  • 심사 : 2024.10.21
  • 발행 : 2024.10.31

초록

Purpose: Variables, such as torque and power, have been measured to evaluate the muscle function. This study examined the effects of a warm-up protocol, including dynamic stretching (DS), on the explosive strength of knee extensors, as well as torque and power. Methods: Twenty-nine healthy young adults participated in this study. Three warm-up protocols, including DS of knee extensors, were used as interventions: (1) DS, (2) DS combined with antagonist muscle static stretching (AMSS), and (3) DS combined with repetitive passive movements (RPM). The outcome measures were the following variables of the knee extensors evaluated using an isokinetic dynamometer: rate of torque and velocity development (RTD and RVD), isometric and isokinetic peak torque (PT), and average power (AP). Results: The results of the two-way (warm-up and time) repeated-measures ANOVA revealed a main effect of time for isometric PT (p=0.001). Post-hoc analysis revealed a significant increase in isometric PT in the post-test compared to the pre-test regarding the DSAMSS (p=0.001) and DS-RPM (p=0.047) warm-up protocols. Conclusion: The three warm-up protocols (DS, DS-AMSS, and DS-RPM) do not appear to influence explosive strength and isokinetic strength at a rapid angular velocity. Considering the relatively high volume of DS used in this study, this may be due to the influence of muscle fatigue. These findings suggest that tailored warm-up protocols for fast muscle contraction and joint acceleration, unlike isometric PT corresponding to static contraction, may require a different approach from existing methods.

키워드

과제정보

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (RS-2023-00249155).

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