No relationship was identified between changes in weight and walking performance post-surgery .
Although physical activity performed after bariatric surgery is associated with enhanced weight loss outcomes , there is limited information on patients ' physical activity behaviour in this context .
This systematic review and meta- analysis assessed pre-operative to post-operative changes in physical activity and physical function outcomes among obese adults undergoing bariatric surgery .
Increased exercise capacity after surgically induced weight loss in morbid obesity.
OBJECTIVE To investigate the effects of surgically induced weight loss on exercise capacity in patients with morbid obesity ( MO ) . RESEARCH METHODS AND PROCEDURES A prospect i ve 1-year follow-up study was carried out , with patients being their own controls . A symptom-limited cardiopulmonary exercise stress test was performed in 31 MO patients ( BMI > 40 kg/m2 ) before and 1 year after undergoing bariatric surgery .  RESULTS At 1 year after surgery , weight was reduced from 146 + /- 33 to 95 + /- 19 kg ( p < 0.001 ) , and BMI went from 51 + /- 4 to 33 + /- 6 kg/m2 ( p < 0.001 ) . After weight loss , obese patients performed each workload with lower oxygen consumption , heart rate , systolic arterial pressure , and ventilatory volume ( p < 0.001 ) . This reduced energy expenditure allowed them to increase the duration of their effort test from 13.8 + /- 3.8 to 21 + /- 4.2 minutes ( p < 0.001 ) . Upon finishing the exercise , MO patients before surgery were able to reach only 83 % of their age-predicted maximal heart rate , and their respiratory exchange ratio was 0.87 + /- 0.06 . After weight loss , those values were 90 % and 1 + /- 0.08 , respectively ( p < 0.01 ) . When we compared the peak O2 pulse corrected by fat free mass before and after surgery , no significant differences between the groups were found . DISCUSSION After surgically induced weight loss , MO patients markedly improved their exercise capacity . This is due to the fact that they were able to perform the external work with lower energy expenditure and also to increase cardiovascular stress , optimizing the use of cardiac reserve . There were no differences in cardiac function before and after surgery
No relationship was identified between changes in weight and walking performance post-surgery .
Although physical activity performed after bariatric surgery is associated with enhanced weight loss outcomes , there is limited information on patients ' physical activity behaviour in this context .
This systematic review and meta- analysis assessed pre-operative to post-operative changes in physical activity and physical function outcomes among obese adults undergoing bariatric surgery .