기능적 피로 프로토콜이 하지의 정적·동적 자세조절 능력에 미치는 영향
Effect of functional fatigue protocol on static and dynamic postural control of lower extremities
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[목적] 본 연구는 기능적 피로 프로토콜이 하지의 동적 및 정적 자세조절의 기능적 움직임 특성에 미치는 영향을 살펴보는 데 있었다. [방법] 총 20명의 대학생(남자 10명, 여자 10명, 나이 22.5±2.7, 체중 67.0±13.0kg, 신장 168.0±8.9cm)을 대상으로 개발된 운동 피로 프로토콜을 실시하였다. 남녀 그룹으로 나누어 기능적 피로 프로토콜 적용 전․후의 혈중 젖산 수치, 심박 수, 운동자각도 검사와 정적·동적 자세조절 검사(10초간 눈 감고 한 발로 균형 지면반력기에 서 있기, 30cm 박스 위에서 한 발로 착지하기)를 측정하여 하지의 기능적 특성 미치는 효과를 검증하였다. [결과] 기능적 피로 프로토콜이 피로 전보다 피로 후에 평균 심박 수 분당 176.3과 평균 운동자각도 18을 보였고, 혈중 젖산 수치는 유의한 차이를 보였다(p<.05). 또한, 정적 자세조절에서 많은 움직임과 실패 횟수를 보였고(p<.05), 동적 자세조절에서 착지 전략이 다소 경직된 동작으로 변했다. 즉, 초기접지 시점과 최대 수직 지면 반력 시점에서 무릎 굽힘이 감소한 결과를 보였다. [결론] 본 연구의 결과로 고안된 운동 피로 프로토콜은 하지의 피로를 유발할 뿐만 아니라 피로-지구력을 향상하는 훈련으로 사용할 수 있다. 향후 연구에서 착지 전략 자세를 명확하게 확인하기 위해 착지 높이를 높일 것을 권장한다.
Abstract
[Purpose] The purpose of this study was to investigate the effects of a functional fatigue protocol on lower extremity dynamic and static postural control. [Methods] A total of 20 physically active collegiate students participated in this study (ten males, ten females; age 22.5±2.7 years; mass 67.0±13.0 kg; height 168.0±8.9 cm). A unilateral stance with eyes closed for 10 seconds was performed to test static postural control using a balance force plate and single-leg drop landing on 30cm box was performed as a dynamic postural control test and captured using VICON motion analysis system. [Results] The results of this study showed an average heart rate of 176.3 beats/minute, an 18 rating on the perceived exertion scale, significant differences in blood lactate, and a static postural control deficit after fatigue as compared with before fatigue(p<.05). Dynamic postural control after fatigue changed landing strategy in the form of stiff landing. Knee flexion was decreased at initial contact and at peak vertical ground reaction force, also, both decreased valgus and internal rotation of knee joint. [Conclusions] This protocol may use for enhancing fatigue-endurance training as well as for inducing fatigue. Further, to ascertain a landing strategy, it is recommended to increase landing height to clearly observe changes in landing strategy.
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