착지 시 낙하높이와 발의 지면 접촉 형태에 의한 하지분절의 변화 (Changes in Lower Extremities by Landing Heights and Foot Strike Patterns during Landing)

서지정보

· 발행기관 : 한국사회체육학회
· 수록지 정보 : 한국사회체육학회지 / 71호 / 527 ~ 537페이지
· 저자명 : 신제민

초록

The purpose of the study is to investigate the changes in lower extremities to attenuate an impact force by landing heights and foot strike patterns during drop landing. Twelve male university students were instructed to perform drop landing tasks from 30 to 60cm heights using forefoot strike landing (FFL) and midfoot strike landing (MFL). Force plates and motion capture system were used to obtain kinematic and kinetic data. Landing phase duration showed an increase only at MFL for 30cm height whereas peak ground reaction force caused an increase at MFL and 60cm height, respectively. Both kinematic and kinetic variables displayed a general increase with an increment in landing heights. With regard to foot stride patterns, the angles in knee and hip joints at MFL increased at an initial contact as well as the lowest height of the body’s mass center while the angle in an ankle joint at FFL grew only at an initial contact. An upward change in the peak angular velocity of ankles was observed at FFL and that of knee and hip joints was found at MFL. In terms of the mean extension moment of hip and knee joint and the mean plantar flexion moment of ankle joint and the mean negative power of three joints, the present study also found that hip and knee joint showed an increase at MFL, whereas ankle joint showed an increase at FFL. In conclusion, the FFL produces the stronger eccentric power by increasing angle and angular velocity of ankle joint, replacing that of hip and knee joints for attenuating the ground reaction force.

영어초록

The purpose of the study is to investigate the changes in lower extremities to attenuate an impact force by landing heights and foot strike patterns during drop landing. Twelve male university students were instructed to perform drop landing tasks from 30 to 60cm heights using forefoot strike landing (FFL) and midfoot strike landing (MFL). Force plates and motion capture system were used to obtain kinematic and kinetic data. Landing phase duration showed an increase only at MFL for 30cm height whereas peak ground reaction force caused an increase at MFL and 60cm height, respectively. Both kinematic and kinetic variables displayed a general increase with an increment in landing heights. With regard to foot stride patterns, the angles in knee and hip joints at MFL increased at an initial contact as well as the lowest height of the body’s mass center while the angle in an ankle joint at FFL grew only at an initial contact. An upward change in the peak angular velocity of ankles was observed at FFL and that of knee and hip joints was found at MFL. In terms of the mean extension moment of hip and knee joint and the mean plantar flexion moment of ankle joint and the mean negative power of three joints, the present study also found that hip and knee joint showed an increase at MFL, whereas ankle joint showed an increase at FFL. In conclusion, the FFL produces the stronger eccentric power by increasing angle and angular velocity of ankle joint, replacing that of hip and knee joints for attenuating the ground reaction force.

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