Vigorous-intensity work is associated with increased odds of cough or expectoration in individuals with mild to moderate COPD

Q: What type of study was this?

This was a cross-sectional study using NHANES 2007-2012 data.

Q: How many participants were included?

723 participants with mild to moderate COPD were included, of whom 115 reported cough or expectoration symptoms.

Q: What was the main finding?

Vigorous-intensity work was associated with 2.43 times higher odds of cough or expectoration after adjusting for multiple confounders.

Q: Does this apply to all COPD patients?

The study focused on mild to moderate COPD (FEV1 ≥50% predicted), so results may not generalize to severe COPD.

In a cross-sectional study of 723 participants with mild-to-moderate COPD from NHANES 2007-2012, self-reported vigorous-intensity work was associated with higher odds of cough or expectoration (OR = 2.43, 95% CI: 1.41-4.22, P = 0.002) after full adjustment. A dose-response relationship was observed between longer duration of vigorous work and increased symptoms.

Last updated: Jul 25, 2026•0 RCTs•📖 Read as article →

Evidence Score

Evidence Score34/100

Human RCT☆☆☆☆☆

Meta-analysis☆☆☆☆☆

Mechanism★★★★★

Safety★★★★☆

Confidencelow

Study Evidence

Study 1. Association between vigorous-intensity work activities and cough or expectoration symptoms in individuals with mild to moderate COPD: a cross-sectional study using the NHANES database.

observational

Guo X, Luo Q, Chen D, Lin H · Respiratory medicine (2026)

Participants: N/A

Duration: N/A

Intervention: Self-reported vigorous-intensity work activities

Outcome: Cough or expectoration symptoms (either symptom for ≥3 months/year)

Effect Size: OR = 2.43 (95% CI: 1.41-4.22)

Population: Adults with mild to moderate COPD (post-bronchodilator FEV1/FVC <0.70 and FEV1 ≥50% predicted) from the NHANES database

Result:

PubMed: 42485676 DOI: 10.1016/j.rmed.2026.109055

Mechanism Graph

Vigorous work activities may increase respiratory demand and airway irritation

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In COPD patients, this can exacerbate airway inflammation and mucus production

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Prolonged exposure leads to cumulative respiratory stress

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Result: Increased likelihood of chronic cough or expectoration

Limitations

⚠Cross-sectional design prevents establishing causality between vigorous work and symptoms
⚠Self-reported vigorous-intensity work may be subject to recall bias and misclassification

Frequently Asked Questions

What type of study was this?▼

This was a cross-sectional study using NHANES 2007-2012 data.

How many participants were included?▼

723 participants with mild to moderate COPD were included, of whom 115 reported cough or expectoration symptoms.

What was the main finding?▼

Vigorous-intensity work was associated with 2.43 times higher odds of cough or expectoration after adjusting for multiple confounders.

Does this apply to all COPD patients?▼

The study focused on mild to moderate COPD (FEV1 ≥50% predicted), so results may not generalize to severe COPD.

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References

1.Guo X, Luo Q, Chen D, Lin H. "Association between vigorous-intensity work activities and cough or expectoration symptoms in individuals with mild to moderate COPD: a cross-sectional study using the NHANES database.." Respiratory medicine, 2026. PMID: 42485676 DOI: 10.1016/j.rmed.2026.109055

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