Ibacache P1, Cano M2, Miranda C3, Rojas JC4
1Universidad Andres Bello, Escuela de Kinesiología, Viña del Mar, Chile, 2Universidad de Chile, Departamento de Kinesiología, Santiago, Chile, 3Universidad Andres Bello, Escuela de Kinesiología, Santiago, Chile, 4Universidad de Valparaíso, Escuela de Kinesiología, Viña del Mar, Chile

Background: Obesity is a major worldwide health problem associated with several physiological disorders, including a significant physical fitness deterioration. The vicious circle between physical inactivity, obesity and poor physical fitness is well known. People with obesity perform less physical activity (PA) compared to eutrophic people. The increase in obesity cases has led to an increase in bariatric surgeries (BS). Although the surgical treatment of obesity is an effective treatment for weight loss, as well as for remission or improvement of obesity-associated comorbidities, the impact on some components of physical fitness (PF), such as cardiorespiratory fitness (CRF) is contradictory.

Purpose: Considering that physical inactivity is the fourth risk factor for global mortality and that cardiorespiratory fitness is an indicator of health and life expectancy, the purpose of this study is to describe the changes in the CRF one year post bariatric surgery and determine the correlation with moderate-vigorous PA previous the BS.

Methods: 12 women with obesity, with a mean age of 39 years old and BMI of 35 kg/m2 were evaluated preoperatively to a sleeve gastrectomy and then after a one year of it. The CRF was determined by VO2peak, with an ergospirometry system Cortex Metalyzer 3b (20-25 Watts increments every 2 minutes in cycle ergometer Monark 915 E), starting with a load of 0.5 Watt/kg of body weight until the stopping criteria (Respiratory Quotient ≥1.1 or modified Borg scale >7 points). PA previous BS was assessed with ActiGraph wGT3X on patients´ waist. Data were collected for 6 days on average and were analyzed with Actilife 6 software, the results were expressed as a percentage of light, moderate and vigorous PA using cutoffs points of Freedson for adults (2011). Paired T Test was used to detect statistical significance for changes in CRF and Spearman test (Rho) to asses correlation between PA and CRF changes. Data was analyzed using SPSS 21.0 software.

Results: The absolute VO2peak decreased one year post bariatric surgery compared to preoperative evaluation (p 0.001). The absolute VO2peak was 1.82 ±0.27 L/min at baseline and 1.45± 0.26 L/min at the first year after surgery. The VO2peak relative to body weight showed an increase from baseline at the one year after the BS (p= 0.027). The relative VO2peak was 20.33 ± 3.49 ml/kg/min at baseline and 22.63± 3.36 ml/kg/min at the first year after surgery. In addition, was observed a directly correlation between preoperatory moderate vigorous physical activity and the change in absolute VO2peak, one year after bariatric surgery (Rho=0.59, p=0.045).

Conclusion(s): A deterioration in the CRF subsequent to BS. The greater the amount of moderate vigorous physical activity performed by the user prior to surgery, the less their cardiorespiratory fitness decreased one year after bariatric surgery.

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. In addition, it would be necessary to incorporate counselling programs to modify the physical activity behavior since the preoperative stage.

Keywords: Physical fitness, physical activity, 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: 163-2016

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

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