Genetically Determined Physical Activity and Its Association with Circulating Blood Cells

Area of Science:

• Genetics and Immunology
• Cardiovascular Disease Research

Background:

• Low physical activity (PA) increases cardiovascular disease risk, impacting public health globally.
• Systemic inflammation, involving circulating blood cells, is a proposed mechanism linking PA to disease.
• Understanding the role of blood cells in PA-related inflammation is crucial.

Purpose of the Study:

• To investigate the relationship between genetically determined PA and circulating blood cell counts.
• To explore how genetic predisposition to PA influences inflammatory markers.

Main Methods:

• Utilized Mendelian randomization analysis with 68 single nucleotide polymorphisms (SNPs) for PA.
• Analyzed data from 222,645 participants in the UK Biobank.
• Applied inverse variance fixed effects models with a Bonferroni-adjusted significance threshold (p < 1.85 × 10⁻³).

Main Results:

• Genetically determined higher PA was significantly associated with decreased lymphocyte counts (β = -0.03, p = 1.35 × 10⁻³).
• Genetically determined higher PA was also associated with decreased eosinophil counts (β = -0.008, p = 1.36 × 10⁻³).

Conclusions:

• Findings suggest a link between increased physical activity and an improved inflammatory profile.
• Reduced lymphocyte and eosinophil levels may indicate a healthier systemic inflammatory state associated with higher PA.
• Further mechanistic studies are needed to confirm these associations.