The presence of known instable cardiac disease

neurological disease and/or musculoskeletal disease that preclude safe participation in an exercise test

a history of drugs/alcohol abuse

vegetarianism

inability to understand the Flemish language.

COPD exacerbation and/or hospitalization in the last 6 weeks

participation in pulmonary rehabilitation in the previous 12 months.

Oral β-Alanine Supplementation in Patients With COPD