Wactisleep bt

Accelerometry was used as an objective measurement of total physical activity (wActisleep-BT and wGT3X-BT; ActiGraph). All participants had to wear an accelerometer on the nondominant wrist during a week. Euclidean Norm Minus One was used to quantify the acceleration related to the movement registered expressed in mg using R software (version 3.1.2, www.cran.r-project.org) with the GGIR package (version 1.5-12, https://cran.r-project.org/web/packages/GGIR/).

The wActiSleep-BT ActiGraph (Pensacola, FL, USA), was used to assess physical activity levels objectively. This is a tri-axial accelerometer that has been validated and used in previous studies (García-Ortiz et al., 2010 , Hansen et al., 2012 , Cain et al., 2013 , de Moura et al., 2015) . Standardized instructions of wearing an accelerometer were provided by research assistants. Participants were asked to wear the accelerometer all day on the wrist of the non-dominant hand for one week and to remove it during bathing or water activities. The accelerometers were initialized, downloaded and analyzed using ActiLife software version 6 (ActiGraph LLC). The sleep period was excluded and the levels of physical activity were defined according to the cut-off points outlined by Freedson (Freedson et al., 1998) . Light physical activity was defined as counts between 101 and 1951, and time in moderate-vigorous physical activity (MVPA) was defined as activities≧1952 cpm (Cain et al., 2013 , Lindamer et al., 2008) . Participants were excluded if the accelerometers were not worn for at least 10 hours per day (excluding sleep period) for at least 5 days (n=38). The average wear time was 13.9±2.1 hours per day for the schizophrenia group and 16.3±1.4 hours per day for the healthy controls.