Energy Expenditure Of Dialysis And Non-dialysis Patients With Chronic Kidney Disease Under Free-living Conditions

Objective To investigate the energy consumption of dialysis and non-dialysis patients with chronic kidney disease under free-living conditions.Methods The dialysis group consisted of twenty randomly selected dialysis patients (10patients with peritoneal dialysis and10patients with hemodialysis), and the non-dialysis group had20patients with chronic kidney disease. These two groups were comparable in age, height, and body weight. Twenty-four hour total energy consumption as well as the energy consumption under different activity patterns(standing, sitting, lying and walking) were measured using MiniSun’s IDEE A (Intelligent Device for Energy Expenditure and Activity) system.Results Daily energy consumption of the dialysis group was significantly higher than that of the non-dialysis group (P<0.05). Also the daily energy consumption per kilogram of body weight of the dialysis group was higher than that of the non-dialysis group(P<0.05). However, there was no difference between the two groups in the proportion of energy expenditure at sitting, standing, walking or lying position. The amount of the energy expenditure of the dialysis group was mostly distributed in the2000-2500kcal/d range, while the non-dialysis group in the1500-2000kcal/d range (P<0.05).The amount of the unit body weight energy expenditure per kilogram of body weight of the dialysis group was mostly distributed in the35-45kcal/kgBW range, while the non-dialysis group in the25-35kcal/kgBW range (P<0.05). The energy consumption of hemodialysis patients was similar to that of peritoneal dialysis patients (P>0.05).The amount and the proportion of energy consumption in lying as well as standing position was higher in hemodialysis group than peritoneal dialysis group. Hemodialysis patients consumed less energy than peritoneal dialysis patients during walking activities (P<0.05).Conclusions Dialysis patients consume more energy than non-dialysis patients. Although the total energy consumption in free-living state is similar between hemodialysis and peritoneal dialysis patients, the proportion of energy consumption is different during standing, lying and walking.