The effects of upper limb exercise training on upper limb muscle strength in people with chronic obstructive pulmonary disease: a systematic review and meta-analysis of randomized controlled trials.

The results of this review showed that resistance ULET could improve UL muscle strength in people with COPD. Most studies, however, were of moderate quality and high risk of bias. Further studies with larger sample sizes, better methodological quality, and standardized training protocols are needed to confirm these findings.