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Related Concept Videos

Longitudinal Research02:20

Longitudinal Research

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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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Longitudinal Studies01:26

Longitudinal Studies

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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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Related Experiment Video

Updated: Dec 18, 2025

Pulse Wave Velocity Testing in the Baltimore Longitudinal Study of Aging
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Birjand longitudinal aging study (BLAS): the objectives, study protocol and design (wave I: baseline data gathering).

Mitra Moodi1,2, Mohammad Dehghani Firoozabadi3,4, Tooba Kazemi3,4

  • 1Social Determinants of Health Research Center, Birjand University of Medical Sciences, Birjand, Iran.

Journal of Diabetes and Metabolic Disorders
|June 19, 2020
PubMed
Summary

The Birjand Longitudinal Aging Study (BLAS) investigates health in older adults. This community-based study aims to identify aging risk factors and inform healthcare policy for improved functional ability in the elderly.

Keywords:
AgedCognitive statusFunctional assessmentGeriatric syndromesStudy profile

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Area of Science:

  • Gerontology and Public Health

Background:

  • Global population aging presents significant healthcare challenges, including geriatric syndromes like frailty, diabetes, cardiovascular diseases, and dementia.
  • Understanding age-related health changes is crucial for preventing and treating health issues in older adults.

Purpose of the Study:

  • To describe the protocol for the first wave of the Birjand Longitudinal Aging Study (BLAS), a community-based prospective cohort study.
  • To establish a baseline for long-term research on aging in a population aged 60 years and above.

Main Methods:

  • A prospective cohort study involving urban and rural residents aged 60+ in Birjand County.
  • Data collection included sociodemographic information, medical history, lifestyle, functional status, cognitive function, quality of life, and social capital through interviews.
  • Objective measures included anthropometrics, electrocardiography, ophthalmologic examinations, and biobanking of blood samples for biochemical and hematologic analysis.

Main Results:

  • The baseline data for the first wave of the Birjand Longitudinal Aging Study (BLAS) were collected from a community-dwelling population aged 60 years and older.
  • The study achieved a 65% response rate among the selected older subjects in urban and rural areas.

Conclusions:

  • The BLAS protocol provides a foundation for identifying risk factors associated with the aging process.
  • Findings will inform policymakers about the need for regional and national healthcare services tailored to the aging population.