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Related Experiment Video

Updated: Sep 1, 2025

A Chronic High-Intensity Interval Training and Diet-Induced Obesity Model to Maximize Exercise Effort and Induce Physiologic Changes in Rats
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Physical activity paradox: could inflammation be a key factor?

Joshua Buron Feinberg1,2, Anne Møller3, Volkert Siersma3

  • 1Department of Occupational and Social Medicine, Holbaek Hospital, Holbaek, Denmark wtv945@alumni.ku.dk.

British Journal of Sports Medicine
|August 12, 2022
PubMed
Summary
This summary is machine-generated.

Physical activity during work may increase systemic inflammation (hs-CRP), while leisure activity may decrease it. Leisure time physical activity was the only significant factor affecting inflammation levels in this study.

Keywords:
Physical activity

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Area of Science:

  • Biomedical Science
  • Epidemiology
  • Public Health

Background:

  • Systemic inflammation, indicated by high-sensitivity C-reactive protein (hs-CRP), is linked to various health outcomes.
  • The impact of physical activity on inflammation may differ based on whether it occurs during occupational duties or leisure time.

Purpose of the Study:

  • To investigate the association between occupational and leisure time physical activity and systemic inflammation (hs-CRP).
  • To determine if the type of physical activity influences inflammation levels.

Main Methods:

  • Utilized data from the Copenhagen Aging and Midlife Biobank, including job history and hs-CRP levels.
  • Assessed occupational physical activity using a job exposure matrix combined with self-reported history, measured in cumulative ton-years.
  • Analyzed associations using multivariable linear regression, adjusting for confounders like age, sex, smoking, chronic diseases, BMI, and alcohol intake.

Main Results:

  • Unadjusted analysis showed higher occupational physical activity correlated with increased hs-CRP, and higher leisure activity with decreased hs-CRP.
  • Adjusted analysis revealed lower leisure activity was linked to 12% higher hs-CRP, while higher occupational activity showed a 6% increase.
  • When treated as continuous variables, only leisure time physical activity significantly affected hs-CRP levels.

Conclusions:

  • The relationship between physical activity and hs-CRP is context-dependent: occupational activity is associated with higher inflammation, whereas leisure activity is linked to lower inflammation.
  • These findings suggest that leisure time physical activity may play a crucial role in mitigating systemic inflammation.
  • The results may offer insights into the 'physical activity paradox,' where physically demanding jobs do not always confer health benefits.