KJCKorea
Journal Central

@article{ART003342572},
author={Hyun Sun Kwon and Gwani Lee and Jae Min Choi and Dong Hyun Won and Ye Eun Kim and Eun Chae Gong and Jun Hee Yang and Woo Young Jung and Ji Woo Jang and Geun Woo Kim and Lee, Han-Suk},
title={Effects of Seat Pan Depth on Trunk and Lower Limb Muscle Activity and Fatigue},
journal={Journal of the Korean Society of Physical Medicine},
issn={1975-311X},
year={2026},
volume={21},
number={2},
pages={111-122}

TY - JOUR
AU - Hyun Sun Kwon
AU - Gwani Lee
AU - Jae Min Choi
AU - Dong Hyun Won
AU - Ye Eun Kim
AU - Eun Chae Gong
AU - Jun Hee Yang
AU - Woo Young Jung
AU - Ji Woo Jang
AU - Geun Woo Kim
AU - Lee, Han-Suk
TI - Effects of Seat Pan Depth on Trunk and Lower Limb Muscle Activity and Fatigue
JO - Journal of the Korean Society of Physical Medicine
PY - 2026
VL - 21
IS - 2
PB - The Korean Society of Physical Medicine
SP - 111
EP - 122
SN - 1975-311X
AB - PURPOSE: This study examined the effects of the seat depth on the trunk and lower extremity muscle activity and fatigue during sitting to identify the biomechanical characteristics related to postural control. METHODS: Thirty healthy college students in their twenties participated. The participants sat on a backless chair with four seat depths corresponding to 30%, 45%, 60%, and 75% of a buttock–popliteal length. The measurements were taken in a standardized posture with the hips and knees at 90° and feet on the floor. Surface electromyography electrodes were attached to the erector spinae, external oblique, and rectus femoris to measure the muscle activity and fatigue. The data were collected for three minutes per condition, with a ten-minute rest between conditions. The order of the seat depth conditions was randomly assigned, and the experiments were conducted under identical conditions. RESULTS: Significant differences in muscle activity were observed according to the seat depth. The erector spinae muscle showed the highest activity at the deepest seat depth (75%), whereas the external oblique muscle showed lower activity at this depth. The rectus femoris muscle showed the lowest activity at a seat depth of 60%. No significant differences in muscle fatigue were observed among the conditions. CONCLUSION: Increasing the seat depth altered the trunk and lower extremity muscle activation patterns, with greater activity in the erector spinae and rectus femoris at deeper seat depths. These findings suggest that appropriate seat depth selection may enhance trunk stability and provide fundamental data for musculoskeletal health management.
KW - Muscle activation;Muscle fatigue;Postural balance;Seat pan depth
DO -
UR -
ER -

Hyun Sun Kwon, Gwani Lee, Jae Min Choi, Dong Hyun Won, Ye Eun Kim, Eun Chae Gong, Jun Hee Yang, Woo Young Jung, Ji Woo Jang, Geun Woo Kim and Lee, Han-Suk. (2026). Effects of Seat Pan Depth on Trunk and Lower Limb Muscle Activity and Fatigue. Journal of the Korean Society of Physical Medicine, 21(2), 111-122.

Hyun Sun Kwon, Gwani Lee, Jae Min Choi, Dong Hyun Won, Ye Eun Kim, Eun Chae Gong, Jun Hee Yang, Woo Young Jung, Ji Woo Jang, Geun Woo Kim and Lee, Han-Suk. 2026, "Effects of Seat Pan Depth on Trunk and Lower Limb Muscle Activity and Fatigue", Journal of the Korean Society of Physical Medicine, vol.21, no.2 pp.111-122.

Hyun Sun Kwon, Gwani Lee, Jae Min Choi, Dong Hyun Won, Ye Eun Kim, Eun Chae Gong, Jun Hee Yang, Woo Young Jung, Ji Woo Jang, Geun Woo Kim, Lee, Han-Suk "Effects of Seat Pan Depth on Trunk and Lower Limb Muscle Activity and Fatigue" Journal of the Korean Society of Physical Medicine 21.2 pp.111-122 (2026) : 111.

Hyun Sun Kwon, Gwani Lee, Jae Min Choi, Dong Hyun Won, Ye Eun Kim, Eun Chae Gong, Jun Hee Yang, Woo Young Jung, Ji Woo Jang, Geun Woo Kim, Lee, Han-Suk. Effects of Seat Pan Depth on Trunk and Lower Limb Muscle Activity and Fatigue. 2026; 21(2), 111-122.

Hyun Sun Kwon, Gwani Lee, Jae Min Choi, Dong Hyun Won, Ye Eun Kim, Eun Chae Gong, Jun Hee Yang, Woo Young Jung, Ji Woo Jang, Geun Woo Kim and Lee, Han-Suk. "Effects of Seat Pan Depth on Trunk and Lower Limb Muscle Activity and Fatigue" Journal of the Korean Society of Physical Medicine 21, no.2 (2026) : 111-122.

Hyun Sun Kwon; Gwani Lee; Jae Min Choi; Dong Hyun Won; Ye Eun Kim; Eun Chae Gong; Jun Hee Yang; Woo Young Jung; Ji Woo Jang; Geun Woo Kim; Lee, Han-Suk. Effects of Seat Pan Depth on Trunk and Lower Limb Muscle Activity and Fatigue. Journal of the Korean Society of Physical Medicine, 21(2), 111-122.

Hyun Sun Kwon; Gwani Lee; Jae Min Choi; Dong Hyun Won; Ye Eun Kim; Eun Chae Gong; Jun Hee Yang; Woo Young Jung; Ji Woo Jang; Geun Woo Kim; Lee, Han-Suk. Effects of Seat Pan Depth on Trunk and Lower Limb Muscle Activity and Fatigue. Journal of the Korean Society of Physical Medicine. 2026; 21(2) 111-122.

Hyun Sun Kwon, Gwani Lee, Jae Min Choi, Dong Hyun Won, Ye Eun Kim, Eun Chae Gong, Jun Hee Yang, Woo Young Jung, Ji Woo Jang, Geun Woo Kim, Lee, Han-Suk. Effects of Seat Pan Depth on Trunk and Lower Limb Muscle Activity and Fatigue. 2026; 21(2), 111-122.

Hyun Sun Kwon, Gwani Lee, Jae Min Choi, Dong Hyun Won, Ye Eun Kim, Eun Chae Gong, Jun Hee Yang, Woo Young Jung, Ji Woo Jang, Geun Woo Kim and Lee, Han-Suk. "Effects of Seat Pan Depth on Trunk and Lower Limb Muscle Activity and Fatigue" Journal of the Korean Society of Physical Medicine 21, no.2 (2026) : 111-122.