Is spontaneous physical activity in a respiratory chamber correlated to habitual physical activity?
Physical activity in a respiratory chamber was correlated to habitual physical activity, whether expressed as AEE, PAL or body-size independent activity units, providing a plausible explanation for the demonstrated association between a low SPA in the chamber and weight gain. The study encourages further studies of the genetic and non-genetic determinants of SPA and non-exercise activity thermogenesis (NEAT).
These results suggest that activin A acts as a growth factor of FLS in RA.