Ibacache P.1,2, Cano M.3, Miranda C.2, Rojas J.C.1
1Universidad de las Américas, Departamento de Morfología y Función, Viña del Mar, Chile, 2Universidad Andrés Bello, Carrera de Kinesiología, Viña del Mar, Chile, 3Universidad de Chile, Departamento de Kinesiología, Santiago, Chile

Background: Physical inactivity and high-calorie intake food, have turned obesity into the pandemic of the century, it has been recognized as an independent risk factor for cardiovascular disease and it has been associated with other multiple comorbidities and significant physical fitness deterioration. This increase in obesity has led to a parallel increase in bariatric surgery; particularly, sleeve gastrectomy (SG), however, there are few studies to determine their impact on cardiorespiratory fitness (CRF) and so far there are no studies that describe the impact of SG in physical activity (PA) of the subjects who undergo it.

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 and PA after bariatric surgery, since SG has had the largest increase in recent years worldwide.

Methods: 24 women with obesity, with a mean age of 36 years old and BMI of 35 kg/m2 were evaluated preoperatively to a SG and then after a month and after three months 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 was assessed with ActiGraph wGT3X on patients’ waist. Data were collected for 6 days on average and were analysed 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). ANOVA was used to detect statistical significance for changes in CRF and Friedman test for PA. 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 absolute VO2peak was 1.93 ±0.35 L/min at baseline, 1.60 ± 0.28 L/min at the first month and 1.65 ± 0.28 L/min for the third month after surgery. The VO2peak relative to body weight showed no change from baseline, at the first month (p =0.073) or three months (p =0.308) after the SG. No changes in PA were observed, comparing the percentage of light (p =0.075), moderate (p =0.217) and moderate-vigorous PA (p =0.075) among the three moments of evaluation. Meanwhile, the percentage of vigorous PA showed differences only between the first and third month post-SG (p =0.033), without changes from preoperative assessment (p =0.063 and 0.328 for the first and third month after surgery respectively).

Conclusion(s): A deterioration in the CRF subsequent to SG, without modification to the PA behaviour of the subjects was observed.

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 behaviour.

Funding acknowledgements: This work was funded with resources of the Universidad de Chile and Universidad Andrés Bello.

Topic: Professional practice: other

Ethics approval: This research was approved by the Ethic Committee of Human Beings Research at Universidad de Chile (reg. number 149-2014).

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

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