Ibacache P1, Cano M2, Miranda C3, Maldonado P4
1Universidad Andres Bello, Facultad de Rehabilitación, Viña del Mar, Chile, 2Universidad de Chile, Departamento de Kinesiología, Santiago, Chile, 3Universidad Andres Bello, Facultad de Rehabilitación, Santiago, Chile, 4Fairlawn Rehabilitation Hospital, Outpatient Department, Massachusetts, United States

Background: Obesity has been recognized as an independent risk factor for cardiovascular
disease, associated with other comorbidities as well as with significant physical fitness deterioration. The increase in obesity cases [3] has led to an increase in laparoscopic sleeve gastrectomy (SG), with a successful weight loss and remission or improvement of comorbidities.
However, its impact on cardiorespiratory fitness (CRF) are yet to be determined.

Purpose: As cardiorespiratory fitness is an indicator of health and life expectancy, the objective of this study was to determine the impact of weight loss, after bariatric surgery, on CRF.

Methods: 24 women with obesity, mean age of 36 years old and BMI of 35 kg/m2 were evaluated
preoperatively to a SG and then after a one and three months postoperative. Patients performed a submaximal cardiopulmonary test on a cyclo-ergometer Monark 915 E to obtain peak oxygen consumption (VO2peak). During the test, gas exchange was measured using a Cortex Metalyzer 3B and heart rate was monitored. A gradual protocol was used, cycling at 60 rpm, starting at 0.5 Watts/kg of body weight with gradual increase of 20 Watts/2 min until the stopping criteria. Weight loss was expressed as % Excess Weight Loss (%EWL). ANOVA was used to detect statistical
significance for changes in CRF and the Spearman correlation coefficient (Rho) for the association between the variables. Data was analysed using SPSS 21.0 software.

Results: The absolute VO2peak decreased after the first (p 0.001) and third month (p=0.001) of
the SG compared to preoperative evaluation. The %EWL obtained at the first post-surgical month was inversely correlated with the change in absolute VO2peak (Rho=-0.636, p=0.001). In the same way, the %EWL at the third month was inversely correlated with the change in absolute VO2peak (Rho=-0.490, p=0.015).

Conclusion(s): After SG, greater weight loss is associated with a greater reduction in VO2 peak,
suggesting the need to implement physical training programs both before and after SG.

Implications: The low VO2peak in patients with obesity prior to SG along with the decrease after this surgery, suggests the need to implement physical training programs both before and after surgery.

Keywords: Physical fitness, Obesity, Bariatric surgery

Funding acknowledgements: Does not apply

Topic: Non-communicable diseases (NCDs) & risk factors

Ethics approval required: Yes
Institution: Universidad de Chile
Ethics committee: Comité de Ética de Investigación en Seres Humanos
Ethics number: 149-2014

All authors, affiliations and abstracts have been published as submitted.

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