4.2 Article

Effects of hip rotation on the electromyographic activity of the medial and lateral hamstrings and muscle force

Journal

JOURNAL OF BACK AND MUSCULOSKELETAL REHABILITATION
Volume 34, Issue 6, Pages 1023-1029

Publisher

IOS PRESS
DOI: 10.3233/BMR-200064

Keywords

Electromyography; force; hamstrings; hip rotation

Funding

  1. 2019 Woosong University Academic Research Funding
  2. Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2017R1C1B5076885]

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The study found that hamstring muscles show high activity during knee flexion, and there are significant differences in hamstring activity and force in different positions. Bi-articular muscles may have different functional dependencies on the corresponding muscles for each joint.
BACKGROUND: In clinical practice, knee flexion at the prone position for manual muscle testing of hamstrings and hip extension at the supine position for stretching of hamstring muscles are typically proposed. OBJECTIVE: Although different positions have been proposed for different purposes in hamstrings, the understanding of the changing the functional role of hamstrings with position changes is poorly understood. METHODS: The electromyographic (EMG) activity and hip extension force were compared among different postures; hip neutral, internal, and external rotation. EMG and force were measured in prone position during knee flexion and those were additionally measured in supine position during hip extension. In supine position, additional measurements were made in hip neutral, internal and external rotation. RESULTS: Hamstrings showed high EMG activity during knee flexion. Knee flexion force in prone position was significantly decreased at hip extension force in supine position. In supine position, EMG activity was significantly higher in semitendinosus (ST) than biceps femoris (BF) during internal rotation. CONCLUSIONS: It should be noted that bi-articular muscles may have different functional dependencies on the corresponding muscles for each joint. In addition, because the altered alignment of the hamstring muscles that was affected by hip rotation had a significant effect on muscle activity, and hip rotation may be helpful for selective training of medial or lateral hamstrings.

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