Associations of sedentary behaviour and physical activity with mental health problems and testos-terone levels among male college students in Chongqing,China
Objective To investigate the associations of sedentary behaviour and physical activity(PA)with mental health problems and testosterone levels in male college students from Chongqing,China.Methods A total of 582 college students from the Male Reproductive Health in Chongqing College Students(MARHCS)cohort study in 2015 were included.Participants completed a questionnaire assessing demographics,sedentary behaviour,PA and mental health information.Physical activity was classified into quartiles based on scores on the physical activity rating scale-3,resulting in the following groups:Q1,Q2,Q3,and Q4.Serum testosterone and cortisol levels were measured by chemiluminescent enzyme immunoas-say.Logistic and linear regressions model were used to analyze associations of sedentary behaviour and PA with mental health problems and serum testosterone and cortisol levels.Results The rates of depression,anxiety,and stress symptoms were 6.70％,12.71％,and 6.70％among 582 male college students,respec-tively.Compare to sedentary behavior＜6 participants,participants in the sedentary behaviour＞10 hours group had higher risk of depression symptoms(OR=6.66,95％CI:2.16-20.49,P=0.001)and lower testosterone levels(-13.22％,95％CI:-19.56％--6.37％,P＜0.001).Participants in the PA Q4 group had lower risk of depression symptoms(OR=0.34,95％CI:0.13-0.87,P=0.025)and higher testoster-one levels(8.02％,95％CI:1.37％-15.10％,P=0.017)than participants in the PA Q1 group.Further analyses found that there were no associations of sedentary behaviour with depression,anxiety and stress symptoms,testosterone and cortisol levels and testosterone/cortisol ratio among college students with high PA level(all P＞0.05).Conclusions Sedentary behavior is a risk factor of depression symptoms and de-creased testosterone level in college students.PA is a protective factor of depression symptoms and associat-ed with increased testosterone levels.PA may protect the adverse effects induced by sedentary behaviour.
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