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Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
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Adolescence is a pivotal period of identity formation, during which individuals begin to answer questions central to their sense of self, such as "Who am I?" and "Who do I hope to become?" Both parents and peers play critical roles in guiding adolescents through this complex developmental phase.
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Longitudinal studies are also widely used in other medical and social science fields. For instance, in cardiovascular research, they can monitor patients' health over decades to identify risk factors for heart disease, such as high cholesterol or smoking, and evaluate the long-term effectiveness of preventive measures. Similarly, in mental health studies, researchers might follow individuals from adolescence into adulthood to understand the development and progression of conditions like...
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During adolescence, individuals experience significant cognitive development that enhances their understanding of others' emotions and thoughts, known as cognitive empathy. This period is marked by an increased ability to adapt to others' perspectives and a more nuanced understanding of others' mental states, a skill that is foundational for social problem-solving and conflict avoidance. The development of cognitive empathy relies heavily on the theory of mind — the...
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In cross-sectional research, a researcher compares multiple segments of the population at the same time. If they were interested in people's dietary habits, the researcher might directly compare different groups of people by age. Instead of following a group of people for 20 years to see how their dietary habits changed from decade to decade, the researcher would study a group of 20-year-old individuals and compare them to a group of 30-year-old individuals and a group of 40-year-old...
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Erik Erikson's fifth stage of psychosocial development, "identity versus role confusion," is crucial during adolescence (ages 12 to 18). In this stage, adolescents face the developmental task of forging a distinct personal identity, a process influenced by social, psychological, and biological changes typical of this period. Adolescents naturally explore different roles, behaviors, and ideologies as they navigate complex questions of self-concept, asking, "Who am I?" and...
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Physical activity patterns in adolescents: A longitudinal study.

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Adolescent physical activity (PA) declined significantly over four years in Brazil. Fewer teens engaged in activities, reduced duration, and less met PA recommendations, highlighting a concerning trend.

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Area of Science:

  • Public Health
  • Adolescent Health
  • Epidemiology

Background:

  • Adolescent physical activity (PA) is crucial for lifelong health.
  • Understanding PA trends in middle-income countries is vital for targeted interventions.
  • Longitudinal data on PA patterns in Brazilian adolescents is limited.

Purpose of the Study:

  • To describe and compare physical activity patterns in Brazilian adolescents over a four-year period.
  • To analyze changes in the type, frequency, and duration of physical activities.
  • To assess adherence to physical activity recommendations among adolescents.

Main Methods:

  • Longitudinal observational study with four data collection waves (2014-2017).
  • 668 adolescents (aged 10-13 in 2014) from public schools in João Pessoa, Brazil.
  • Physical activity assessed via questionnaire, defining patterns by type, frequency, duration, and recommendation adherence.

Main Results:

  • Most common activities included active commuting, games, dancing, cycling, soccer, and futsal.
  • A significant linear decline was observed in the number of adolescents participating in most activities.
  • Both the duration of physical activities and the proportion meeting PA recommendations decreased substantially (52.8% to 32.2%).

Conclusions:

  • Physical activity engagement among Brazilian adolescents shows a declining trend over four years.
  • Interventions are needed to promote sustained physical activity participation in this age group.
  • Further research should explore factors influencing these PA declines in middle-income settings.