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The Effects of Knee Angle and Audiovisual Feedback on Sagittal Plane Body Alignment in Long Sitting Postures of University Students

  • Journal of the Korean Society of Physical Medicine
  • Abbr : J Korean Soc Phys Med
  • 2025, 20(2), pp.1~10
  • Publisher : The Korean Society of Physical Medicine
  • Research Area : Medicine and Pharmacy > Physical Therapy > Other physical therapy
  • Received : January 26, 2025
  • Accepted : March 22, 2025
  • Published : May 31, 2025

이준석 1 최바다 1 김정한 1 문채희 1 유예찬 1 김민지 1 이성렬 1 고하은 1 선희창 2

1을지대
2강원특별자치도원주의료원

Accredited

ABSTRACT

PURPOSE: This study examined the effects of the knee angle on body alignment in the sagittal plane of university students in prolonged sitting positions. METHODS: The study participants were 16 male and 14 female university students. The test was conducted in three different positions maintained for 30 minutes per position, with the subject looking forward as in an actual class. Sitting in a height-adjustable chair without a backrest, with hip joints locked at 90° in the seated position, the test consisted of three positions: knee angle of 90°, knee angle above 90°, and knee angle below 90°. The sagittal plane body alignment was measured before and after each test. Each subject was measured by Ex-body musculoskeletal analysis. RESULTS: All three postures showed a significant increase in the lordosis angle over time (p < .05), but no significant difference between the three postures was shown (p > .05). The thoracic-tilted angle became significantly larger in the 90°-posture test (p > .05). The craniovertebral angle was unchanged over time for any of the three postures (p > .05), and there was no difference between the three postures (p > .05). CONCLUSION: Sitting with a knee angle of less than 90° had the best effect on body alignment, rather than a knee angle of 90°, which is the conventionally recognized correct posture.

Citation status

* References for papers published after 2023 are currently being built.