The study aimed to compare differences in physical activity, the relationship between physical activity and body composition, and seasonal variation in physical activity in outpatients with anorexia nervosa (AN) and healthy controls. Physical activity (CM-AMT) and time spent in different intensities of 10 female individuals with AN and 15 female controls was assessed across three seasons along with the percentage body fat. The two groups did not differ in their physical activity and both demonstrated seasonal variation. The percentage body fat of individuals with AN, but not that of the controls, was negatively related to CM-AMT and time spent in low-moderate intesnity acitivy (LMI). Seasonal variation in physical activity emerged with increases in engagement in LMI during the summer period for both groups. Possible interpretations of the finding that decreased physical activity was related to a normalization of percentage body fat in the individuals with AN are discussed and implications for treatment are highlighted.
Tanja Hechler, Elizabeth Rieger, Stephen Touyz, Pierre Beumont, Guy Plasqui and Klaas Westerterp
Anouk WMC Oortwijn, Guy Plasqui, John J. Reilly and Anthony D. Okely
The purpose of this pilot study was to assess the feasibility of a structured activity protocol in a room calorimeter among young children.
Five healthy children (age 5.2 ± 0.4 y) performed an activity protocol in a room calorimeter, ranging from sedentary to vigorous-intensity activities. Energy expenditure (EE) was calculated from continuous measurements of O2-consumption and CO2-production using Weir’s formula. Resting EE was defined as EE during the first 30 min of the study where participants were seated while watching television. The children wore an ActiGraph accelerometer on the right and left hip.
The protocol was well tolerated by all children, and lasted 150 to 175 min. Further, differences were seen in both EE and accelerometer counts across 3 of the 4 activity intensities.
It is feasible for young children to perform a structured activity protocol in a room calorimeter enhancing the possibility of conducting future studies to cross-validate existing accelerometer prediction equations.