The association between systemic inflammation and the time spent in posture and movement during daytime in patients with chronic obstructive pulmonary disease and lower weight.
Atsuyoshi Kawagoshi, Masahiro Iwakura, Yutaka Furukawa and 3 others
PMID 33362350WHAT IT FOUND
In 11 underweight COPD patients, more walking time linked to lower muscle mass but higher inflammation.
Standing time linked to higher inflammation. The authors suggest increasing activity in this group might worsen inflammation, so low-intensity exercise and nutrition are preferred.
Key findings
01Time spent walking was significantly correlated with fat-free mass, fat-free mass index, and IL-8 levels.
02Time spent standing was significantly correlated with C-reactive protein and IL-6 levels.
03The authors suggest that increased physical activity in underweight COPD patients might be associated with higher systemic inflammation.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
Very small sample size (11 patients) limits generalizability and statistical power. Cross-sectional design cannot establish causality between activity and inflammation. No control group of COPD patients with normal weight for comparison. Single-center study with potential selection bias. Many confounding factors (age, gender, smoking, comorbidities) were not controlled for in the analysis. The authors' conclusion that increased activity might worsen inflammation is based on correlation, not experimental manipulation.
Declared interests
The authors have no conflicts of interest to declare.
The easy way to misread this
Do not assume that increasing physical activity will reduce inflammation in underweight COPD patients. This study found positive correlations between activity time and inflammatory markers, but it is a small pilot with no control group. The direction of causality is unknown, and the authors' suggestion that activity might worsen inflammation is speculative.