Sodium intake and bronchial hyperresponsiveness in adults

Area of Science:

• Respiratory Medicine
• Clinical Nutrition
• Epidemiology

Background:

• Previous studies suggest a link between sodium intake and asthma or bronchial hyperresponsiveness (BHR), but findings are inconsistent.
• Investigating this association is crucial for understanding respiratory health.
• The European Community Respiratory Health Survey (ECRHS) provides a valuable dataset for such research.

Purpose of the Study:

• To analyze the association between dietary sodium intake and BHR to methacholine in adults.
• To determine if sodium intake influences the risk of BHR and mild BHR.
• To explore sex-specific differences in the sodium-BHR relationship.

Main Methods:

• Dietary sodium intake estimated using 3-day weighed food records.
• Multiple logistic regression models used to assess BHR (PD20) and mild BHR (PD10) risk across sodium intake quartiles.
• Analyses were adjusted for confounders and stratified by sex; PD20 also analyzed as a continuous variable (tDRS).

Main Results:

• Women had higher BHR prevalence and lower sodium intake than men.
• No significant association found between sodium intake and overall BHR (PD20) in either sex after adjustments.
• Mild BHR (PD10) was significantly associated with higher sodium intake quartiles in women, but not in men.

Conclusions:

• Dietary sodium intake does not appear to affect overall BHR (PD20) to methacholine.
• Higher sodium intake may be linked to increased mild BHR (PD10), particularly in women.
• PD10 should be considered alongside PD20 in future studies examining the impact of sodium on BHR.