Vitamin D trial reports better walking performance in deficient men with COPD
A small placebo-controlled trial found improvements in walking distance, breathlessness and fatigue after supplementation, while reporting no improvement in measures of ventilation.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Vitamin D supplementation improved walking-test distance, breathlessness scores and fatigue scores compared with placebo in men with stable COPD and low vitamin D. Ventilation measures reportedly did not improve. These findings concern a narrowly defined patient group; without the size of the changes, their practical importance is difficult to judge.
This abstract-based summary has significance tests but no distances, score changes or confidence intervals. The small trial involved only men who smoked and had low vitamin D, and it does not report safety outcomes.
What researchers found
Six-minute walk distance
Vitamin D versus placebo after 26 weeks; the walking-distance result favored supplementation. The abstract reports statistical significance without a distance difference or confidence interval.
How treatment was compared
The study compared supplements with placebo under blinding, while giving both groups the same sunlight-exposure advice. Supplement dosing changed during the trial according to blood vitamin D and calcium results.
Keeping the outcomes distinct
Walking performance and symptom scores assess exercise tolerance. The authors separately state that ventilation measures did not improve, without providing detailed estimates. These outcomes should be interpreted separately when considering what the trial actually showed.
The original publication
Does Vitamin D₃ Supplementation Improve Exercise Tolerance of D₃ Deficient Chronic Obstructive Lung Disease Patients? - A Randomized Controlled Trial.
Hassan S, Ali T, Bennoor KS et al.
Mymensingh Med J · 2026
- PubMed ID
- 41914100
- Record checked
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