K리그1 프로축구선수들의 넙다리네갈래근과 뒤넙다리근의 등속성 근력 값
Isokinetic Quadriceps and Hamstring Muscle Strength Values in K League 1 Professional Soccer Players
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[목적] 본 연구의 목적은 K리그1 프로축구선수들의 넙다리네갈래근과 뒤넙다리근의 등속성 근력 데이터를 제시하고, 선행연구들과 비교하는 것이었다. [방법] 하지 부상 이력을 고려하여, 총 31명의 프로축구선수가 본 연구의 분석대상에 포함되었다. 각속도 60°·s-1 및180°·s-1에서 우세측과 비우세측의 무릎관절 굼힘과 폄의 등속성 근력을 측정하였고, 피크토크(peak torque, PT), 체중당 피크토크(normalized PT, NPT), 양쪽 근력 차이(bilateral strength difference, BD), 뒤넙다리근 대 넙다리네갈래근의 근력 비율(hamstring to quadriceps ratio, H/Q 비율)을 측정 변인으로 하였다. [결과] 각속도 60°·s-1에서, 넙다리네갈래근의 NPT는 우세측·비우세측 각각 3.39N·m·kg-1, 3.33N·m·kg-1으로 나타났으며, 뒤넙다리근은 각각 2.00N·m·kg-1, 1.89N·m·kg-1으로 나타났다. 각속도 180°·s-1에서, 넙다리네갈래근의 NPT는 우세측·비우세측 각각 2.31N·m·kg-1, 2.27N·m·kg-1으로 나타났으며, 뒤넙다리근은 각각 1.42N·m·kg-1, 1.39N·m·kg-1으로 나타났다. 측정한 모든 각속도에서, 넙다리네갈래근과 뒤넙다리근의 BD는 6.6~7.8% 범위로, H/Q 비율은 57~62% 수준으로 나타났다. 부상 이력을 고려하지 않은 선행연구들에 비해 본 연구에서는 더 낮은 수준의 BD (＜10%) 및 더 높은 수준의 NPT 값이 나타났다. [결론] 본 연구에서 제시된 넙다리네갈래근과 뒤넙다리근의 등속성 근력 값은 K리그1 프로축구선수들의 무릎관절 등속성 근력 평가 시 참고값(reference values)으로서 사용될 수 있을 것이다.
Abstract
PURPOSE This study aimed to present isokinetic quadriceps and hamstring muscle strength values in K league 1 (K1) professional soccer players and compare these results to those of published studies. METHODS A total of 31 K1 soccer players (age 24.5±4.2) without a history of lower limb injury were included in this study. Isokinetic knee strength tests were implemented at a velocity of 60°·s-1 and 180°·s-1 for both dominant (D) and non-dominant (ND) legs using a dynamometer. Strength variables included peak torque (PT), body mass normalized PT (NPT), bilateral strength difference (BD), and hamstring to quadriceps strength (H/Q) ratio. RESULTS At 60°·s-1 velocity, the NPTs of the quadriceps were 3.39N·m·kg-1 and 3.33N·m·kg-1 for D and ND legs, respectively, and those of the hamstrings were 2.00N·m·kg-1 and 1.89N·m·kg-1 for D and ND legs, respectively. At 180°·s-1 velocity, the NPTs of the quadriceps were 2.31N·m·kg-1, 2.27N·m·kg-1 for D and ND legs, respectively, and those of the hamstrings were 1.42N·m·kg-1, 1.39N·m·kg-1 for D and ND legs, respectively. At all velocities, the BDs of quadriceps and hamstring muscles ranged from 6.6–7.8%, and H/Qs ranged from 57–62%. Compared to previous studies that did not consider the history of injury, this study showed lower levels of BD (less than 10%) and higher levels of NPT. CONCLUSIONS The presented isokinetic quadriceps and hamstring muscle strength values can be used as reference values for the isokinetic knee strength of K1 professional soccer players.
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