메뉴 건너뛰기
소속 기관 / 학교 인증
인증하면 논문, 학술자료 등을  무료로 열람할 수 있어요.
한국대학교, 누리자동차, 시립도서관 등 나의 기관을 확인해보세요
(국내 대학 90% 이상 구독 중)
고객센터 ENG
주제분류

논문 기본 정보

저자정보
출처
Wiley Physiological Reports 13(10)
오류 신고하기
표지

검색

    초록·키워드

    This study investigated the effects of progressively increasing voluntary activation during the stretch phase on force and work production in the stretch-shortening cycle (SSC) of human knee extensors. Fifteen young adults performed SSCs under four stretch activation conditions: passive stretch (ST<sub>0%</sub>-SC), feedback-guided active stretch (ST<sub>40%</sub>-SC and ST<sub>80%</sub>-SC), and maximal effort stretch (ST<sub>100%</sub>-SC). All conditions involved maximal voluntary activation during shortening, followed by a fixed-end contraction at 20°. Outcome measures included joint torque and work, estimated fascicle force and work, vastus lateralis fascicle length and velocity, and quadriceps activation. Compared to passive stretch, active stretch conditions produced greater SSC effects, with no significant differences between ST<sub>80%</sub>-SC and ST<sub>100%</sub>-SC. Fascicle work did not differ significantly across conditions, suggesting a decoupling between joint-level output and fascicle-level contribution. Active stretch primarily enhanced force production during early shortening; however, the SSC effect persisted until mid-to-late shortening (80° to 38°) in ST<sub>80%</sub>-SC. ST<sub>0%</sub>-SC also showed nearly twice the fascicle shortening velocity of other conditions. Following shortening, ST<sub>100%</sub>-SC exhibited greater residual force depression during the isometric phase, despite similar activation. These findings demonstrate that voluntary activation during stretch modulates SSC effect through a complex interplay involving muscle-tendon unit decoupling and history-dependent effects, fascicle dynamics, and tendon compliance.

    본문·목차

    최근 본 자료 전체보기