Background

Bariatric surgery can be used to treat obesity and obesity-related comorbidities. There are concerns of excess loss of muscle mass after bariatric surgery, especially in elderly patients whose muscle mass tends to be less compared to younger patients at baseline. The objective of this study is to investigate changes in total muscle mass and muscle mass percent, in patients who are greater than or equal to 65 years of age, who underwent bariatric surgery.

Methods

Retrospective analysis of prospectively collected data from May 2015 to March 2017 was performed.Total body weight, total muscle mass and percent muscle mass of patients greater than or equal to 65 years of age, who underwent either laparoscopic sleeve gastrectomy or Roux-en-Y gastric bypass were examined using Tanita scale.Repeat measures analysis of variance was performed to evaluate the data.

Results

89 patients (74% female) greater than or equal to 65 years of age were included.87 patients underwent laparoscopic sleeve gastrectomy and 2 patients underwent Roux-en-Y gastric bypass.The mean starting total body weight was 251.9 +/- 41.5 kg and the mean total body weight at 12 months was 197 +/- 38.9 kg (p equals less than 0.001). The mean starting muscle mass was 125.0 +/- 26.8 kg and the mean muscle mass at 12 months was 115.1 +/- 25.2 kg (p equals less than 0.001). The mean starting muscle mass percent was 49.6 +/- 6.4 % and the mean muscle mass percent at 12 months 58.1 +/- 8.0% (p equals less than 0.001).

Conclusions

Bariatric surgery, specifically the laparoscopic sleeve gastrectomy and the Roux-en-Y gastric bypass, results in total body weight loss as well as loss of muscle mass in kilograms, while increasing total percentage of muscle mass, in patients greater than or equal to 65 years of age.