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Objectives Objectively measured sedentary behavior (SB) on weekdays and weekends has been mainly assessed in white‐collar workers, while data in blue‐collar workers are sparse. Therefore, this study presented the difference in accelerometer‐measured SB levels between weekdays and weekends, stratified by white‐ and blue‐collar occupations. Methods This study was a sub‐analysis of accelerometer data from 73 workers (31 blue‐collar and 42 white‐collar) at a Japanese manufacturing plant. SB was defined as ≤1.5 metabolic equivalents estimated using an accelerometer, and compared between weekdays and weekends by using mixed models adjusted for confounders. The proportion of workers who sat for ≤8 h/day on weekdays and weekends were compared using McNemar's test. Results In white‐collar workers, SB time on weekdays was significantly longer than that on weekends (598 vs 479 min/day, P .99). Conclusions White‐collar workers were exposed to significantly longer SB time on weekdays than on weekends, which was not the case in blue‐collar workers. It may be rather challenging for white‐collar workers to limit their SB time to the level recommended by the latest guidelines for better health, especially on weekdays.

Objectives To compare physical activity (PA) and sedentary behavior (SB) levels during work time between those who work from home (WFH) and at workplaces (no WFH), and by WFH subgroups. Methods This cross‐sectional internet‐based survey included 1239 workers (mean age [standard deviation], 44.7 [13.7] years; 59.2% men) living in the Tokyo Metropolitan Area. Time spent sitting (SB), standing (light‐intensity PA; LPA), walking, and engaging in heavy labor (moderate‐to‐vigorous PA; MVPA) during work time was measured using the Work‐related Physical Activity Questionnaire. Workers reported weekly WFH percentages (eg, 0% implies no WFH and 100% implies full WFH), and WFH percentages were categorized into no WFH (0% WFH) and WFH (1%‐100% WFH) groups. The WFH group was further subcategorized into 1%‐25%, 26%‐50%, 51%‐75%, and 76%‐100% subgroups. Results Overall, 494 workers (39.9%) worked from home. During working hours, SB time was longer in the WFH group than in the no WFH group (mean minutes [% working‐time SB]: 335.7 vs 224.7 min [74% vs 50%]). Significantly shorter LPA and MVPA times (%) were reported in the WFH group than in the no WFH group (LPA, 59.6 vs 122.9 min [14% vs 29%]; MVPA, 55.3 vs 91.9 min [13% vs 22%], all P