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Effects of Roux-en-Y Gastric Bypass on Resting Energy Expenditure in Women

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Abstract

Background

Bariatric surgery is the gold standard treatment for morbid obesity, but little is known about its effects on resting energy expenditure.

Method

Twenty-one women underwent anthropometric and resting energy expenditure (REE) measurements before and 3 months after bariatric surgery using the Roux-en-Y gastric bypass (RYGBP) technique developed by Capella.

Results

The patients experienced a significant reduction in body weight, body mass index, waist circumference, and waist-to-hip ratio (WHR). The cardiopulmonary variables oxygen uptake, carbon dioxide output, non-protein respiratory quotient, and heart rate all decreased, whereas oxygen pulse did not change significantly. Absolute REE showed a significant reduction 3 months postoperatively (2006.7 ± 376.4 kcal/day to 1763.3 ± 310.5 kcal/day), but no significant difference was found compared with REE relative to body weight (0.71 ± 0.15 kcal kg−1h−1 to 0.75 ± 0.12 kcal kg−1 h−1) or as percent of Harris-Benedict predicted REE (106.2 ± 21.0% to 103.3 ± 15.1%).

Conclusion

In this study, bariatric surgery using the RYGBP technique (Capella) led to a significant decrease of body weight that decreased resting energy expenditure proportional to this weight loss, and to an increase in the utilization of fat as an energy substrate. It can be concluded that after 3 months, the Roux-en-Y gastric bypass surgery may provide significant metabolic benefits to morbidly obese women.

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Acknowledgments

We thank Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), for the scientific initiation scholarship, and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), for the master’s degree scholarships.

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Authors and Affiliations

  1. College of Health Sciences (FACIS), Piracicaba Methodist University (UNIMEP), Rodovia do Açúcar Km 156–Taquaral, Piracicaba, CEP 13400-911, SP, Brazil

    Marcelo de Castro Cesar, Adalberto Vicente de Oliveira Jr, Pamela Roberta Gomes Gonelli & Gabrielle Aparecida Cardoso

  2. College of Exact and Natural Sciences, Piracicaba Methodist University (UNIMEP), Piracicaba, SP, Brazil

    Maria Imaculada de Lima Montebelo

  3. Clínica Bariátrica, Centro de Gastroenterologia e Cirurgia da Obesidade do Hospital dos Fornecedores de Cana de Piracicaba, Piracicaba, SP, Brazil

    Irineu Rasera Jr

Authors
  1. Marcelo de Castro Cesar
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  2. Maria Imaculada de Lima Montebelo
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  3. Irineu Rasera Jr
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  4. Adalberto Vicente de Oliveira Jr
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  5. Pamela Roberta Gomes Gonelli
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  6. Gabrielle Aparecida Cardoso
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Correspondence to Marcelo de Castro Cesar.

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de Castro Cesar, M., de Lima Montebelo, M.I., Rasera, I. et al. Effects of Roux-en-Y Gastric Bypass on Resting Energy Expenditure in Women. OBES SURG 18, 1376–1380 (2008). https://doi.org/10.1007/s11695-008-9460-8

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  • DOI: https://doi.org/10.1007/s11695-008-9460-8

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