Exercise training optimizes cardiorespiratory fitness (CRF) after bariatric surgery, but the effect of spontaneous physical activity is not well known. This study aimed to objectively quantify changes in CRF and habitual physical activity 6 months after bariatric surgery and to examine whether change in CRF was related to change in physical activity.
Secondary analyses were performed on data from women who underwent Roux-en-Y gastric bypass (RYGB) between 2010 and 2014. Measurements were performed before and 6 months after RYGB and included V̇O2peak (graded maximal exercise test on a cycle ergometer), habitual physical activity (Actigraph GT3x accelerometer worn during 7 days), and body composition (DXA absorptiometry). Changes after RYGB were analyzed using Wilcoxon signed-rank test. Relations between change in CRF and change in physical activity were analyzed with Spearman correlations adjusted on age and preoperative BMI.
Forty-five women (median [P25–P75] age, 43.0 [38.0–51.0] year; BMI, 42.6 [40.0–45.5] kg/m2) were included. Mean (SD) weight loss 6 months after RYGB was − 27.5 (7.9) kg (P < 0.001). Absolute V̇O2peak decreased by 0.35 (0.50) L/min (P < 0.001) and relative V̇O2peak tended to increase by 1.7 (5.3) mL/kg/min (P = 0.06), both with large inter-individual variability. Based on objective accelerometry data, daily steps and moderate-to-vigorous physical activity increased by 1275 (3164) steps/day and 7.6 (19.3) min/day, respectively (both P < 0.05). Change in absolute V̇O2peak was positively related to change in moderate-to-vigorous physical activity (r = 0.35; P = 0.03).
The decrease in absolute CRF observed 6 months after RYGB might be prevented by increasing habitual physical activity.
clinicaltrials.gov identifier: NCT01113996
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We recognize the contribution of the Unité de Recherche Clinique/Clinical Unit Research, Pitie-Salpetriere Hospital, Paris, France, in data acquisition and management. We express our thanks to the patients for their participation in this study.
This work was supported by PHRC Programme Hospitalier de Recherche Clinique-Ile de France (AOR 09 059).
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The authors declare that they have no conflicts of interest.
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Bellicha, A., Ciangura, C., Roda, C. et al. Changes in Cardiorespiratory Fitness After Gastric Bypass: Relations with Accelerometry-Assessed Physical Activity. OBES SURG 29, 2936–2941 (2019). https://doi.org/10.1007/s11695-019-03932-2