In Patients with rheumatic disease exercise training is a well established element of therapy. In contrast patients with severe pulmonary hypertension are advised to avoid physical exertion and must not perform exercise training. This study aims to evaluate the effectivity and safety of a low-dose training program in patients with pulmonary hypertension and rheumatic disease.

Inclusion Criteria:

1. Informed consent

2. Men and women 18 - 80 years

3. Diagnosed rheumatic disease: rheumatoid arthritis, Collagenosis (Systemic Lupus Erythematodes, Systemic Sclerosis, Sjögren-Syndrome, Sharp-Syndrome, Crest-Syndrome, Mixed connective tissue disease)

4. Symptomatic PAH (WHO- functional class II-IV) invasively diagnosed by right heart catheterisation

   • Mean pulmonary artery pressure (mPAP) > 25 mmHg
   • Pulmonary capillary wedge pressure (PCWP) > 15 mmHg
   • Pulmonary vascular resistance (PVR) at baseline >320 dyn.sec/cm5 patients under optimized medical treatment since at least 2 ½ months

Exclusion Criteria:

1. Other forms of PAH.
2. Pregnancy or lactation
3. Change in medication during the last 2 ½ months
4. Patients with signs of right heart decompensation
5. Severe impairment of walking
6. Unclear diagnosis
7. No invasive diagnosis of PH
8. Acute illness, infection, fever
9. Severe lung disease with FEV1 <50% and TLC< 70% below reference