Related Experiment Videos
Cardiopulmonary response to exercise in anorexia nervosa
L Lands1, A Pavilanis, T D Charge
1Montreal Children's Hospital Research Institute-McGill University, Canada.
Pediatric Pulmonology
|June 1, 1992
Summary
Malnutrition in adolescent girls with anorexia nervosa (AN) significantly reduces exercise capacity. However, their cardiopulmonary function and cardiac output remain appropriate despite reduced work capacity.
Area of Science:
- Exercise Physiology
- Nutritional Science
- Pediatric Cardiology
Background:
- Malnutrition, common in anorexia nervosa (AN), often leads to systemic diseases and exercise limitation.
- Reduced exercise capacity in AN is linked to muscle loss, dysfunction, and impaired cardiovascular responses.
Purpose of the Study:
- To investigate the impact of malnutrition on cardiopulmonary responses during exercise in adolescent girls with AN.
- To assess exercise capacity and cardiovascular function in relation to nutritional status.
Main Methods:
- Evaluated nine adolescent girls with AN and ten controls using progressive and steady-state cycle ergometry.
- Measured nutritional status via body mass percentile (BMP) and percent ideal weight (PIWT).
- Assessed cardiac output using the CO2 rebreathing Fick method; work capacity (Wmax) was compared to predicted values.
Main Results:
- Six of nine AN patients had significantly reduced Wmax (70 +/- 22% predicted) compared to controls (112 +/- 37%).
- Wmax strongly correlated with nutritional status (BMP: r=0.75; PIWT: r=0.8).
- Ventilatory responses and cardiac output were appropriate in both AN and control groups.
Conclusions:
- Malnutrition in AN is a primary factor limiting exercise capacity in adolescent girls.
- Despite reduced work capacity, the cardiopulmonary system and cardiac output are preserved in AN patients.
- This suggests that AN-related malnutrition impacts skeletal muscle and overall work output more than central cardiovascular function.