【論文摘要】Effect of Fatigue on Lower Limb Symmetry During Double Roundhouse Kick in Taekwondo Athletes

【論文摘要】疲勞對於跆拳道運動員二連踢時下肢對稱性的影響

Yao-Zong Chang(張耀宗) ； Jan-You Huang(黃仁佑) ； Yu-Xin Zhang(張譽馨) ； Wen-Chieh Yang(楊文傑)

《物理治療》 48卷2期 (2023/06) Pp. 123-123

https://doi.org/10.6215/FJPT.202306.O21

摘要

Background and Purpose: Taekwondo (TKD) athletes showed remarkable bilateral lower limb symmetry in kicking. Our previous work reported that fatigue substantially reduced the lower limb symmetry of roundhouse kicks. We are further interested in how fatigue might affect the lower limb symmetry of more demanding kick skills. Therefore, this study investigated the effect of fatigue on bilateral lower limb symmetry during double roundhouse kicks in TKD athletes. Methods: Twenty-two TKD athletes underwent a simulated game test, which included three 2-minute rounds. In each round, participants were asked to conduct 32 roundhouse kicks (16 single and 16 double) according to the visual instructions. Double kicks are defined as the participant rising the leg once and hitting the target twice. Bilateral hip and knee angles were measured using 6 inertial measurement units placed on trunk and legs. Bilateral lower limb symmetry was calculated using the symmetry angle (SA), with 0% indicating perfect symmetry and 100% indicating perfect opposite. ANOVA with repeated measures was used to investigate the effect of fatigue (round 1, 2, and 3) on SA of hip and knee peak angular velocities during the first and second kicks. Results: Regarding the first kick, hip abduction SA in round 3 was significantly higher than in round 1 (R3: 7.21 ± 2.83% vs. R1: 4.58 ± 2.29%, p = 0.03), and no significant difference in hip flexion (R1: 4.12 ± 2.33%, R2: 4.92 ± 3.13%, R3: 5.21 ± 2.74%) and knee extension (R1: 3.28 ± 2.03%, R2: 4.58 ± 2.38%, R3: 4.47 ± 3.03%) among 3 rounds. Regarding the second kick, no significant difference in hip abduction (R1: 4.32 ± 2.31%, R2: 4.91 ± 2.03%, R3: 4.01 ± 2.77%), hip flexion (R1: 4.21 ± 2.53%, R2: 4.82 ± 3.11%, R3: 5.21 ± 2.79%), and knee extension (R1: 3.02 ± 2.31%, R2: 3.92 ± 3.17%, R3: 3.21 ± 2.78%) among 3 rounds. Conclusion: Bilateral lower limb symmetry of kicking leg rise gradually reduced with the development of fatigue through sparring. Hip muscles, especially the abductors, were the most vulnerable. Clinical Relevance: Strength and endurance of hip muscles are critical to maintaining the lower limb symmetry of roundhouse kicks, and thus should be emphasized in training programs.