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Related Concept Videos

Bioavailability Study Design: Healthy Subjects Versus Patients01:15

Bioavailability Study Design: Healthy Subjects Versus Patients

Bioavailability studies are essential for evaluating a drug's therapeutic efficacy and understanding its absorption patterns under various physiological conditions. Conducting such studies on target patient populations provides more relevant data by simulating real-world disease states. However, practical challenges often necessitate the use of young, healthy adult volunteers as study subjects.Patients may exhibit altered drug absorption patterns due to the effects of the disease itself,...
Longitudinal Research02:20

Longitudinal Research

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...
Study Designs in Epidemiology01:20

Study Designs in Epidemiology

Epidemiological study designs are fundamental tools for investigating the distribution, determinants, and control of health conditions in populations. They help researchers understand the relationships between exposures and outcomes, and they broadly fall into two categories: "observational" and "experimental" studies.
Observational studies are those where the researcher does not intervene but rather observes natural variations. They include cross-sectional, cohort, and case-control studies.

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Related Experiment Video

Updated: May 11, 2026

Methodology for Establishing a Community-Wide Life Laboratory for Capturing Unobtrusive and Continuous Remote Activity and Health Data
11:21

Methodology for Establishing a Community-Wide Life Laboratory for Capturing Unobtrusive and Continuous Remote Activity and Health Data

Published on: July 27, 2018

Chicago Healthy Aging Study: objectives and design.

Amber Pirzada1, Kathryn Reid, Daniel Kim

  • 1Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA. apirza2@uic.edu

American Journal of Epidemiology
|May 15, 2013
PubMed
Summary
This summary is machine-generated.

Maintaining a low-risk profile for cardiovascular disease (CVD) in middle age is linked to better health outcomes in older adults. This study examined long-term health in individuals with low CVD risk factors.

Keywords:
cardiovascular diseaseepidemiologic studiesfollow-up examinationrisk factors

Related Experiment Videos

Last Updated: May 11, 2026

Methodology for Establishing a Community-Wide Life Laboratory for Capturing Unobtrusive and Continuous Remote Activity and Health Data
11:21

Methodology for Establishing a Community-Wide Life Laboratory for Capturing Unobtrusive and Continuous Remote Activity and Health Data

Published on: July 27, 2018

Area of Science:

  • Epidemiology
  • Gerontology
  • Cardiovascular Disease Research

Background:

  • The Chicago Healthy Aging Study (CHAS) re-examined participants from the Chicago Heart Association Detection Project in Industry (CHA) cohort.
  • Baseline cardiovascular disease (CVD) risk profiles were established between 1967-1973 for individuals aged 25-44 years.
  • Low-risk (LR) status was defined by favorable levels of four major CVD risk factors.

Purpose of the Study:

  • To examine the long-term association of maintaining a low-risk profile for CVD with objectively measured health in older age.
  • To hypothesize that individuals with LR status in middle age will exhibit less clinical and subclinical CVD, lower inflammatory markers, and better physical functioning and sleep quality in older age.
  • To describe the rationale, objectives, design, and implementation of this longitudinal epidemiologic study.

Main Methods:

  • Re-examined 1,395 surviving participants (aged 65-84 years) from the original CHA cohort.
  • Categorized participants into low-risk (LR) (n=421) and non-low-risk (non-LR) (n=974) groups based on baseline CVD risk factors.
  • Compared baseline and follow-up characteristics of participants and nonparticipants.

Main Results:

  • The study describes the design and feasibility of re-examining participants after an extended period with minimal interim contact.
  • Baseline characteristics of participants and nonparticipants were compared.
  • The long-term association of LR status with health in older age was examined, though specific results are detailed elsewhere.

Conclusions:

  • The study highlights the feasibility of conducting longitudinal research with extended follow-up periods.
  • Investigating the long-term health benefits of maintaining a low-risk profile for cardiovascular disease is crucial.
  • Further research is warranted to fully elucidate the health outcomes associated with sustained low cardiovascular disease risk.