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Sedentary screen time and left ventricular structure and function: the CARDIA study.

Bethany Barone Gibbs1, Jared P Reis, Erik B Schelbert

  • 11University of Pittsburgh, Pittsburgh, PA; 2National Heart, Lung, and Blood Institute, Bethesda, MD; 3Northwestern University Feinberg School of Medicine, Chicago, IL; 4Kaiser Permanente Division of Research, Oakland, CA; 5Johns Hopkins Institutes of Medicine, Baltimore, MD; and 6University of Alabama at Birmingham, Birmingham, AL.

Medicine and Science in Sports and Exercise
|July 19, 2013
PubMed
Summary
This summary is machine-generated.

Sedentary screen time is linked to increased left ventricular mass in white adults, primarily due to higher adiposity. This association was not observed in Black adults, suggesting race-specific cardiovascular impacts of screen-based behaviors.

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Area of Science:

  • Cardiovascular disease research
  • Public health and preventative medicine
  • Human physiology

Background:

  • Sedentary screen time is an independent predictor of cardiovascular outcomes.
  • Excessive screen time may negatively impact cardiac structure and function.
  • Understanding these effects is crucial for preventative health strategies.

Purpose of the Study:

  • To investigate the association between sedentary screen time and left ventricular structure and function.
  • To determine if screen time affects cardiac measurements.
  • To explore potential racial differences in these associations.

Main Methods:

  • Utilized data from the Coronary Artery Risk Development in Young Adults Study (CARDIA).
  • Assessed screen time via questionnaire and cardiac parameters via echocardiography in 2854 participants (aged 43-55).
  • Employed generalized linear models to analyze cross-sectional trends, adjusting for demographics, lifestyle, and metabolic factors.

Main Results:

  • Higher screen time correlated with increased left ventricular mass (LVM) in white participants (P < 0.001).
  • This association in whites persisted after adjusting for cardiovascular risk factors but was attenuated by body mass index.
  • No significant associations were found between screen time and left ventricular structure or function in Black participants.

Conclusions:

  • Sedentary screen time is associated with greater LVM in white adults, largely explained by increased adiposity.
  • The findings suggest potential qualitative differences in how sedentary screen-based behavior affects cardiovascular health across racial groups.
  • Further research is warranted to explore these race-specific cardiovascular consequences.