Pedro C. Hallal, Jeovany Martínez-Mesa, Carolina V.N. Coll, Grégore I. Mielke, Márcio A. Mendes, Márcio B. Peixoto, Tiago N. Munhoz, Virgilio V. Ramires, Maria Cecilia Assunção, Helen Gonçalves and Ana M. B. Menezes
To evaluate the longitudinal association between physical activity behavior at 11 years of age and the incidence of mental health problems from 11 to 15 years of age.
Individuals born in the city of Pelotas, Brazil, in 1993 have been followed up since birth. At 11 and 15 years of age, mental health was assessed using the Strengths and Difficulties Questionnaire (SDQ). At 11 years of age, physical activity was assessed through a validated questionnaire. The continuous SDQ score at 15 years was used as the outcome variable. The main exposure was physical activity behavior at 11 years of age divided into 3 categories (0, 1−299, >300 min/wk).
The incidence of mental health problems from 11 to 15 years was 13.6% (95% CI, 12.4−14.9). At 11 years, 35.2% of the adolescents achieved 300 min/wk of physical activity. In the unadjusted analysis, physical activity was inversely related to mental health problems (P = .04). After adjustment for confounders, the association was no longer significant in the whole sample but was still significant among boys.
Physical activity appears to be inversely related to mental health problems in adolescence, but the magnitude of the association is weak to moderate.
Priscila M. Nakamura, Grégore I. Mielke, Bernardo L. Horta, Maria Cecília Assunção, Helen Gonçalves, Ana M.B. Menezes, Fernando C. Barros, Ulf Ekelund, Soren Brage, Fernando C. Wehrmeister, Isabel O. Oliveira and Pedro C. Hallal
Physical inactivity is responsible for 7% of diabetes deaths worldwide, but little is known whether low levels of physical activity (PA) during adolescence increase the risk of diabetes in early adulthood. We evaluated the cross-sectional and longitudinal associations between PA throughout adolescence and HbA1c concentration in early adulthood.
HbA1c was measured by high performance liquid chromatography. PA was assessed by self-report at the ages of 11, 15, and 18 years and by accelerometry at the ages of 13 (subsample) and 18 years. The loss percentages of follow up were 12.5% at 11 years, 14.4% at 15 years, and 18.7% at 18 years.
At 18 years, boys showed higher HbA1c than girls. At age 18 years, accelerometrybased PA at 18 years was inversely related to HbA1c levels in boys. Self-reported leisure-time PA at ages 11, 15, and 18 were unrelated to HbA1c in both genders. PA at 13 years of age was unrelated to HbA1c among both genders. In trajectory analysis, PA and accelerometer PA trajectories were not associated with later HbA1c.
Objectively measured PA at 18 years was cross-sectionally inversely associated with HbA1c in boys only. No prospective associations were identified.