Erratic control of breathing during exercise in patients  with systemic lupus erythematosus: a pilot-study.
OBJECTIVE
The aim of this study was to provide a comprehensive evaluation of the pattern and timing of breathing during incremental exercise in a sample of women living with systemic lupus erythematosus (SLE).


METHODS
In this cross-sectional study, 20 women with SLE without pulmonary involvement were compared with 20 gender-, body mass index- (BMI), and age-matched healthy individuals. By using a cardiopulmonary incremental exercise test, the following parameters were assessed: tidal volume (VT); breathing frequency (BF); total respiratory time (TOT); inspiratory time (TI); expiratory time (TE); inspiratory time to total time (TI/TOT); mean inspiratory flow (VT/TI); ventilatory equivalent for carbon dioxide (VE/VCO2) and end-tidal carbon dioxide pressure (PETCO2).


RESULTS
BF and BF/VT were significantly higher in patients with SLE versus controls, whereas VT, TE, TI and TOT were significantly lower in the former group ( p<0.05). Additionally, patients with SLE presented higher VE/VCO2 and lower PETCO2 than controls ( p<0.05), suggesting a ventilatory inefficiency.


CONCLUSIONS
We reported compelling evidence of abnormal pattern and timing of breathing during incremental exercise in SLE. Considering that an erratic control of breathing may play an important role in exercise intolerance and fatigue, respiratory exercises emerge as a potential treatment for these symptoms in patients with SLE.
Division of Rheumatology, School of Medicine, University of Sao Paulo, Brazil.
D M L
DM
do Prado
B
B
Gualano
R
R
Miossi
F R
FR
Lima
H
H
Roschel
E
E
Borba
E
E
Bonfa
A L
AL
de Sá Pinto
D000328:Adult; D003430:Cross-Sectional Studies; D015444:Exercise / Q000502:physiology*; D017079:Exercise Tolerance; D005221:Fatigue; D005260:Female; D006801:Humans; D008180:Lupus Erythematosus, Systemic / Q000503:physiopathology*; D010865:Pilot Projects; D012119:Respiration