Rodríguez-Romero, BeatrizSmith, Michelle D.Pértega-Díaz, SoniaQuintela-del-Río, AlejandroJohnston, Venerina2022-03-072022-03-072022-02-16Rodríguez-Romero B, Smith MD, Pértega-Díaz S, Quintela-Del-Rio A, Johnston V. Thirty minutes identified as the threshold for development of pain in low back and feet regions, and predictors of intensity of pain during 1-h laboratory-based standing in office workers. Int J Environ Res Public Health. 2022 Feb 16;19(4):2221.1661-7827http://hdl.handle.net/2183/29886[Abstract] This study with 40 office workers investigated (a) the effect of time spent standing on low- back and lower limb pain during a 1-h laboratory-based task; (b) the standing time after which a significant increase in pain is likely; and (c) the individual, physical and psychosocial factors that predict pain. The primary outcome was bodily location of pain and pain intensity on a 100-mm Visual Analogue Scale recorded at baseline and every 15 min. Physical measures included trunk and hip motor control and endurance. Self-report history of pain, physical activity, psychosocial job characteristics, pain catastrophizing and general health status were collected. Univariate analysis and regression models were included. The prevalence of low-back pain increased from 15% to 40% after 30 min while feet pain increased to 25% from 0 at baseline. The intensity of low-back and lower limb pain also increased over time. A thirty-minute interval was identified as the threshold for the development and increase in low-back and feet pain. Modifiable factors were associated with low-back pain intensity—lower hip abductor muscle endurance and poorer physical health, and with feet symptoms—greater body mass index and less core stability.engCreative Commons Attribution 4.0 International Licence (CC-BY 4.0)http://creativecommons.org/licenses/by/4.0/Low back painStanding positionMusculoskeletal painLower extremityjournal articleopen access10.3390/ijerph19042221