The effect of an intensive residential rehabilitation program on body composition in patients with cystic fibrosis.

The pulmonary function of patients with cystic fibrosis (CF) is associated with nutritional status not only expressed as body mass index (BMI) but also as fat-free mass index (FFMI). This study evaluated the effect of a residential rehabilitation program on nutritional status (BMI, FFMI). The rehabilitation program provided supervised respiratory and nutritional treatment and daily physical activity for 3 weeks (median stay 20 (19-25) days). At the start and the end of the program, weight, height, pulmonary function, and body composition using dual-energy X-ray absorptiometry were prospectively collected. Supervised weighed food records were obtained, and physical activity intensity was measured using a SenseWear Pro3 Armband. CF-related complications were collected from the patient. Thirty-four patients (21 males, median age 18 years old (12-27)) were included. The diet contained a median of 30 EN% fat, 16 EN% protein, and 52 EN% of carbohydrates. A significant median weight gain (+1.45 kg (0.58; 2.6) (p < 0.0001) and a significant increase in BMI (+0.24 kg/m (0.11; 0.38)) (p < 0.0001), FFMI (+0.26 kg/m (0.01; 0.55)) (p < 0.0001), and FMI (+0.19 kg/m (0.04; 0.41)) (p < 0.0001) were obtained.Conclusion: A short rehabilitation program in individuals with CF between 6 and 40 years old is able to improve nutritional status and body composition.Trial registration: NCT04527796 What is Known: • Fat-free mass depletion is frequently present in CF. • In CF pulmonary function is associated with nutritional status measured as body mass index but also fat-free mass index. What is New: • Nutritional status and body composition improve significantly after a short-term rehabilitation program. • The rehabilitation program was able to improve nutritional outcome even with a diet containing less fat than currently advised in the guidelines.