Relation Between Clinical Depression Risk and Physical Activity and Time Spent Watching Television in Older Women: A 10-Year Prospective Follow-up Study
Key result
Higher physical activity (≥90 mins/day) was associated with lower depression risk (RR 0.80; 95% CI 0.70-0.92), whereas watching TV ≥21 hours/week increased risk (RR 1.13; 95% CI 1.00-1.27).
Why the study?
Do physical activity and television watching affect the risk of clinical depression in older women?
Population
49,821 US women from the Nurses' Health Study, free from depressive symptoms at baseline (1996)
Comparison
Higher levels of physical activity and… vs Lowest level of physical activity and lowest…
Design
Cohort
Follow-up
10 years
Authors
Discussion
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Member takes
Implication
Supports activity and TV counseling in older women; leaves open whether interventions alter depression incidence.
Study Design
Type
Cohort (n=49,821)
Structured PICO
Do physical activity and television watching affect the risk of clinical depression in older women?
P
Population
49,821 US women from the Nurses' Health Study, free from depressive symptoms at baseline (1996)
I
Intervention
Higher levels of physical activity (e.g., ≥ 90 minutes/day) and television-watching time (e.g., ≥ 21 hours/week)
C
Comparator
Lowest level of physical activity (<10 minutes/day) and lowest television-watching time (0-1 hour/week)
O
Outcome
Incident clinical depression (self-reported physician-diagnosed depression or use of antidepressants) over 10 years
Main Result
Effect estimate: RR 0.80 (95% CI 0.70-0.92)
p-value: p=< 0.001
Higher physical activity is independently associated with a lower risk of clinical depression, whereas more time spent watching television is associated with a higher risk in older women.
Cite This Study
Lucas et al. (2011) conducted a cohort in Clinical depression (n=49,821). Physical activity vs. <10 minutes/day was evaluated on Clinical depression (self-reported physician-diagnosed depression or use of antidepressants) (RR 0.80, 95% CI 0.70-0.92, p=< 0.001). Higher physical activity (≥90 mins/day) was associated with lower depression risk (RR 0.80; 95% CI 0.70-0.92), whereas watching TV ≥21 hours/week increased risk (RR 1.13; 95% CI 1.00-1.27).