What does this research mean for the field?

Greater social jet-lag and reduced weekend moderate-to-vigorous physical activity bidirectionally predict increased depression in adolescents over time. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To determine the longitudinal and bidirectional relationships between behavioral rhythm irregularities—specifically social jet-lag and weekend physical activity shifts—and depressive symptoms in school-aged youth.

September 2, 2026BMC PsychiatryOpen Access

Social jet-lag, weekday-weekend differences in moderate-to-vigorous physical activity, and depression in adolescents: a longitudinal cross-lagged study

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Authors

JLJingjing Lu SZSen Zhang YFYuanyang Fang

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Implication

Longitudinal study reveals bidirectional links between irregular sleep-activity rhythms and depression in adolescents, suggesting behavioral consistency protects mental health.

Key Points

To determine the longitudinal and bidirectional relationships between behavioral rhythm irregularities—specifically social jet-lag and weekend physical activity shifts—and depressive symptoms in school-aged youth.
Conducted a two-wave mental health screening among students in grades 5–12 in NL county, China, at baseline in October–November 2024 and follow-up in November 2025.
Tracked 25,941 adolescents who completed both waves of assessment, achieving a 90.36% follow-up rate.
Utilized cross-lagged panel models to evaluate directional associations between social jet-lag, moderate-to-vigorous physical activity distribution, and depression over a one-year interval.
Greater social jet-lag at baseline predicted higher depression severity at one-year follow-up, whereas dedicating a higher proportion of weekend time to moderate-to-vigorous physical activity predicted lower depression.
Baseline depression prospectively predicted worse social jet-lag and a reduced share of weekend time engaged in moderate-to-vigorous physical activity at follow-up.

Cite This Study

Lu et al. (2026) studied this question.

synapsesocial.com/papers/6a97e249c562ede874ec6615 https://doi.org/10.1186/s12888-026-08560-6

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Implication

Longitudinal study reveals bidirectional links between irregular sleep-activity rhythms and depression in adolescents, suggesting behavioral consistency protects mental health.

Social jet-lag, weekday-weekend differences in moderate-to-vigorous physical activity, and depression in adolescents: a longitudinal cross-lagged study

Discussion

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Implication

Key Points

Cite This Study

Social jet-lag, weekday-weekend differences in moderate-to-vigorous physical activity, and depression in adolescents: a longitudinal cross-lagged study

Discussion

Member takes

Implication

Key Points

Cite This Study

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