• Sang-Min Park, Ho-Joong Kim, Hyunseok Jeong, Hyoungmin Kim, Bong-Soon Chang, Choon-Ki Lee, and Jin S Yeom.
• Spine Center and Department of Orthopedic Surgery, Seoul National University College of Medicine and Seoul National University Bundang Hospital, 82, Gumi-ro 173 Beon-gil, Bundang-gu, Seongnam, Gyeonggi-do 13620, Republic of Korea.
• Spine J. 2018 Nov 1; 18 (11): 2051-2058.

Background ContextThere is increasing evidence supporting an association between sitting time and low back pain (LBP). However, the degree of the association between the total daily sitting time and LBP in the general population is poorly understood.PurposeThe present study aimed (1) to analyze the association between the duration of sitting time and LBP, and (2) to examine this association according to the degree of physical activity in population over 50 years of age with a nationally representative sample of Korean adults.Study DesignThis is a cross-sectional study.Patient SampleData from version VI-2, 3 of the Korea National Health and Nutrition Examination Survey (KNHANES) performed in 2014 and 2015 were analyzed.Outcome MeasuresMultiple logistic regression was performed to find the rates of association between chronic LBP, level of sitting time, and physical activity.MethodsNationwide health surveys and examinations were conducted in general Korean representative populations (n=7,550 in 2014, n=7,380 in 2015). Chronic LBP was defined as self-reported LBP lasting for more than 30 days during the past 3 months in a health survey. Sitting time and daily physical activity were evaluated using the long version of the International Physical Activity Questionnaires (IPAQ). The duration of sitting time was divided into two categories according to the median value (7 hours) and further divided into four categories using quartiles. Physical activity was also divided into low and high physical activity according to duration of mid- to high-intensity activities. There were no sources of funding and no conflicts of interest associated with the present study.ResultsOn multiple logistic regression analysis, sitting time more than 7 hours/day was significantly associated with LBP (adjusted odds ratio 1.33, p<.001). The risk of LBP increased with increasing duration of sitting time. In participants with low levels of physical activity, the duration of sitting time showed more positive association with LBP than that in all the participants and participants with high levels of physical activity.ConclusionsLonger duration of sitting time is a risk factor for LBP. Furthermore, long duration of sitting time with low physical activity further increases the risk of LBP.Copyright © 2018 Elsevier Inc. All rights reserved.

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