Relationship between energy expenditure, physical activity and weight loss during CPAP treatment in obese OSA subjects

Michele Bamberga, Maurizio Rizzi, Felice Gadaleta, Attilio Grechi, Renata Baiardini, Francesco Fanfulla

Research output: Contribution to journalArticlepeer-review


Background Increased energy expenditure (EE) has been reported in patients with obstructive sleep apnea (OSA). It has been postulated that CPAP treatment may induce weight reduction in obese patients, even if it has not been confirmed by recent studies. In the present study we investigated the effect of OSA on EE and the effect of CPAP on body weight and physical activity. Methods One hundred and seven obese OSA patients and 25 healthy obese volunteers, as control group, matched for age, sex and BMI, were enrolled. The following evaluation was performed only in OSA patients after 6 months of CPAP treatment. Results Baseline total EE was similar in the two groups, but OSA patients showed higher EE during the night, while control group during daytime. In patients, EE correlates with OSA severity, degree of daytime sleepiness or obesity. At follow-up evaluation, BMI and total EE were unchanged. However, daytime EE increased (1066 ± 131.5 vs 1104 ± 133 Kcal/die, p <0.001, respectively) and night EE decreased (694 ± 69 vs 595 ± 73, p <0.0001, respectively). Statistically significant changes in BMI, sleepiness scale, blood gases and EE were found only in patients who were compliant to CPAP. Conclusions Obese OSA patients showed an increased night EE that was normalized only in those patients compliant to CPAP. Body weight and daily physical activity did not change in statistically significant way.

Original languageEnglish
Pages (from-to)540-545
Number of pages6
JournalRespiratory Medicine
Issue number4
Publication statusPublished - Apr 1 2015


  • CPAP
  • Energy expenditure
  • Obesity
  • Sleep
  • Sleep apnea
  • Sleepiness

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine
  • Medicine(all)


Dive into the research topics of 'Relationship between energy expenditure, physical activity and weight loss during CPAP treatment in obese OSA subjects'. Together they form a unique fingerprint.

Cite this