Physical capacity, respiratory quotient and energy expenditure during exercise in male patients with schizophrenia compared with healthy controls.
BACKGROUND
Despite massive research on weight gain and metabolic complications in schizophrenia there are few studies on energy expenditure and no current data on physical capacity.


OBJECTIVE
To determine oxygen uptake capacity, respiratory quotient (RQ) and energy expenditure during a submaximal exercise test in patients with schizophrenia and healthy controls.


METHODS
Ten male patients and 10 controls were included. RQ and energy expenditure were investigated with indirect calorimetry during a cycle ergometer test. The submaximal work level was defined by heart rate and perceived exhaustion. Physical capacity was determined from predicted maximal oxygen uptake capacity (VO(2-max)).


RESULTS
The patients exhibited significantly higher RQ on submaximal workloads and lower physical capacity. A significant lower calculated VO(2-max) remained after correction for body weight and fat free mass (FFM). Energy expenditure did not differ on fixed workloads.


CONCLUSIONS
RQ was rapidly increasing in the patients during exercise indicating a faster transition to carbohydrate oxidation and anaerobic metabolism that also implies a performance closer to maximal oxygen uptake even at submaximal loads. This may restrict the capacity for everyday activity and exercise and thus contribute to the risk for weight gain. Physical capacity was consequently significantly lower in the patients.
Nilsson
B M
BM
Department of Neuroscience, Psychiatry, Uppsala University, Uppsala University Hospital, 75185 Uppsala, Sweden. bjorn.nilsson@neuro.uu.se
Olsson
R M
RM
Oman
A
A
Wiesel
F A
FA
Ekselius
L
L
Forslund
A H
AH
D000328:Adult; D004734:Energy Metabolism / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D006801:Humans; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption / Q000502:physiology*; D010809:Physical Fitness / Q000502:physiology; D012559:Schizophrenia / Q000503:physiopathology*