Earticle

초록

영어

The purpose of this study was to examine the effects of relative angular velocity conditions (10%, 40%, 70%, and 100% of each participant's maximal angular velocity) on isokinetic period characteristics and quadriceps muscle activation during knee extension in healthy young adults. Specifically, mean angular velocity, the proportions of acceleration, maintained, and deceleration periods, and the activation of , vastus medialis (VM), vastus lateralis (VL) and rectus femoris (RF) were measured and compared across velocity conditions, and correlations among these variables were analyzed. Thirty-eight healthy young adults participated in this study. Isokinetic knee extension was performed under relative velocity conditions set at 10%, 40%, 70%, and 100% of each participant's maximal angular velocity. The proportions of acceleration, maintained, and deceleration periods were analyzed, and electromyography was used to assess the activation of the VM, VL and RF. As velocity increased, the proportion of the maintained period decreased, whereas the acceleration and deceleration periods increased. The maintained period was relatively preserved at 10–40% but markedly reduced at higher velocity conditions. Among the quadriceps muscles, only RF showed a significant decrease in activation with increasing velocity, while VM and VL showed no significant changes. Mean angular velocity showed positive correlations with the acceleration and deceleration periods, and a negative correlation with the maintained period. Among the muscles, only RF showed a significant negative correlation with mean angular velocity. These findings indicate that isokinetic contractions are not uniformly maintained across velocity conditions and that relative velocity influences both period structure and muscle activation patterns. In particular, the 10–40% range of maximal velocity may represent a condition in which isokinetic characteristics are more effectively achieved, suggesting its potential relevance for isokinetic assessment and application.

목차

Abstract
Ⅰ. 서론
Ⅱ. 연구방법
1. 연구 설계 및 연구 대상자
2. 표본 수 산출
3. 실험 절차
4. 등속성 평가
5. 근전도
6. 분석방법
Ⅲ. 결과
Ⅳ. 고찰
1. 상대 속도 조건에 따른 가속 구간, 유지 구간, 감속 구간의 비율 변화
2. 상대 속도 조건에 따른 넙다리네갈래근의 근활성도 변화
3. 평균 각속도, 등속성 구간 및 근활성도 간의 상관관계
4. 결론 및 제한점
인용문헌

키워드

저자

• 우종근 [ Jong-Geun Woo | 선문대학교 물리치료학과 ]
• 전정우 [ Jeong-Woo Jeon | 선문대학교 물리치료학과 ]
• 유재호 [ Jae-Ho Yu | 선문대학교 물리치료학과 ]
• 김진섭 [ Jin-Seop Kim | 선문대학교 물리치료학과 ]
• 남연교 [ Yeon-Gyo Nam | 선문대학교 물리치료학과 ]
• 이동엽 [ Dong-Yeop Lee | 선문대학교 물리치료학과 ]
• 홍지헌 [ Ji-Heon Hong | 선문대학교 물리치료학과 ] 교신저자

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국신경근육재활학회지 [Korean Journal of Neuromuscular Rehabilitation]

• 간기

  계간

• pISSN

  2508-6456

• 수록기간

  2011~2026

• 등재여부

  KCI 등재

• 십진분류

  KDC 514 DDC 617