@article{ref1,
title="Effect of reclining angle on lumbar lordosis at driving posture: a radiological evaluation",
journal="Journal of back and musculoskeletal rehabilitation",
year="2018",
author="Nam, Hyung Seok and Han, Manyong and Choi, Hyung Yun and Song, Kyuman and Kang, Seonggyu and Ahn, Sung Min and Lee, Shi-Uk",
volume="31",
number="5",
pages="923-930",
abstract="BACKGROUND: Optimal seatback angles for automobile drivers' seats have been investigated based on comfort and back muscle activities; however, radiology supported evidences are scarce. <br><br>OBJECTIVE: The aim of this study was to evaluate optimal range of the seatback reclining regarding torso angles for an automobile driver's seat to preserve lumbar lordosis. <br><br>METHODS: Thirty-one healthy volunteers were recruited among five body type categories. Lateral lumbar spine X-rays were obtained for the neutral sitting posture without seatback (reference), and with reclining angles of 23∘ to 33∘ by 2∘ intervals. The Cobb angles for the L1-L4, L4-S1, and L1-S1 segments were measured. <br><br>RESULTS: The Cobb angle for L4-S1 was nearest to the reference (18.74 ± 1.57∘, mean ± standard error mean) at reclining angles of 29∘ and 31∘ (14.51 ± 1.41∘ and 14.47 ± 1.43∘, respectively). The Cobb angle at L4-S1 between reclining angles of 27∘ (12.02 ± 1.31∘) and 29∘ (14.51 ± 1.41∘) were significantly different (p< 0.001). Tall men showed relatively preserved lordosis angles at all reclining angles. Fat men and short women demonstrated prominent loss of lordosis with excessively kyphotic L1-L4 segment. <br><br>CONCLUSIONS: Reclining angles of 29∘ to 31∘ revealed to be optimal for preserving lordosis at the L4-S1 segment. Individualized healthcare-related guideline for driver's seat adjustment setting is necessary.<p /> <p>Language: en</p>",
language="en",
issn="1053-8127",
doi="10.3233/BMR-170875",
url="http://dx.doi.org/10.3233/BMR-170875"
}