안굽이 및 밖굽이 무릎을 가진 젊은 성인들에게서 등척성운동 시 안쪽넓은근과가쪽넓은근의 근수축 개시시간 차이 (Differences of Onset Timing Between Vastus Medialis and Lateralis during Knee Isometric Contraction on Individuals with Genu Varum or Valgum)

서지정보

· 발행기관 : 대한물리치료학회
· 수록지 정보 : 대한물리치료학회지 / 26권 / 1호 / 9 ~ 14페이지
· 저자명 : 박설, 이우진, 박지원

초록

Purpose: The purpose of this study was to investigate how different knee alignments (genu varum and genu valgum) affectedactivations of quadriceps muscles with measurements of onset-time differences between vastus medialis and vastus lateralisduring isometric contractions at both 30 and 60 degree knee flexion.
Methods: Fifty-two adults (20 genu varum, 12 genu valgum, and 20 control) were enrolled in this study. Subjects with over 4cmdistance between knee medial epicondyles were assigned to Genu varum, while subjects with over 4cm distance between anklesmedial malleolus were considered as genu valgum group. Surface EMG was used to measure onset time of both vastus medialisand vastus lateralis during isometric contraction at 30 and 60 degree knee flexion.
Results: The onset time of vastus lateralis was delayed in genu varum group, and that of vastus medialis was delayed in genuvalgum group at both 30 and 60 degree knee flexions. Moreover, onset time difference at 30° knee flexion between muscleswas larger in genu valgum group than genu varum group.
Conclusion: Subjects with genu varum or valgum activated quadriceps muscles with different orders pending on flexiondegrees. Therefore, when quadriceps training program were planned to prevent pain or deformities, the findings that quadricepswere activated with different orders affected by knee alignments and joint degree at which trainings were performed, must beconsidered. If the selective training programs of quadriceps femoris are planned to prevent pain or deformities due to poor kneealignments, these should consider the subject’ s knee alignment condition.

영어초록

Purpose: The purpose of this study was to investigate how different knee alignments (genu varum and genu valgum) affectedactivations of quadriceps muscles with measurements of onset-time differences between vastus medialis and vastus lateralisduring isometric contractions at both 30 and 60 degree knee flexion.
Methods: Fifty-two adults (20 genu varum, 12 genu valgum, and 20 control) were enrolled in this study. Subjects with over 4cmdistance between knee medial epicondyles were assigned to Genu varum, while subjects with over 4cm distance between anklesmedial malleolus were considered as genu valgum group. Surface EMG was used to measure onset time of both vastus medialisand vastus lateralis during isometric contraction at 30 and 60 degree knee flexion.
Results: The onset time of vastus lateralis was delayed in genu varum group, and that of vastus medialis was delayed in genuvalgum group at both 30 and 60 degree knee flexions. Moreover, onset time difference at 30° knee flexion between muscleswas larger in genu valgum group than genu varum group.
Conclusion: Subjects with genu varum or valgum activated quadriceps muscles with different orders pending on flexiondegrees. Therefore, when quadriceps training program were planned to prevent pain or deformities, the findings that quadricepswere activated with different orders affected by knee alignments and joint degree at which trainings were performed, must beconsidered. If the selective training programs of quadriceps femoris are planned to prevent pain or deformities due to poor kneealignments, these should consider the subject’ s knee alignment condition.

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