Resistance Training and Protein Supplementation Increase Strength After Bariatric Surgery: A Randomized Controlled Trial.
Study Goal
The researchers aimed to determine whether resistance training combined with dietary protein supplementation could effectively maintain body composition and physical fitness after bariatric surgery.
Results Summary
The study found no significant difference in lean body mass loss between groups, but resistance training with protein supplementation led to a greater increase in relative lower-limb muscle strength compared to controls or protein supplementation alone.
Population
Seventy-six women with obesity undergoing Roux-en-Y gastric bypass surgery.
Effective Dosage
Not specified (additional whey protein intake and supervised strength training).
Duration
18 weeks.
Interactions
None mentioned.
| Intervention | Direction | Endpoint | Population | Dosage | Impact | Claim # |
|---|---|---|---|---|---|---|
usual care (controls) | decrease | lean body mass | women with obesity undergoing Roux-en-Y gastric bypass | mean, -8.8 kg; 95% CI: -10.1 to -7.5 kg | Loss over time in lean body mass did not differ between groups | #1 |
usual care and additional (whey) protein intake | decrease | lean body mass | women with obesity undergoing Roux-en-Y gastric bypass | mean, -8.2 kg; 95% CI: -9.3 to -7.1 kg | Loss over time in lean body mass did not differ between groups | #2 |
usual care, additional protein intake, and supervised strength training for 18 weeks | decrease | lean body mass | women with obesity undergoing Roux-en-Y gastric bypass | mean, -7.7 kg; 95% CI: -9.0 to -6.5 kg | Loss over time in lean body mass did not differ between groups | #3 |
usual care (controls) | increase | relative lower-limb muscle strength | women with obesity undergoing Roux-en-Y gastric bypass | +0.1 (-0.1 to 0.4) kg/kg body mass | increase in relative lower-limb muscle strength | #4 |
usual care and additional (whey) protein intake | increase | relative lower-limb muscle strength | women with obesity undergoing Roux-en-Y gastric bypass | +0.2 (0.0 to 0.4) kg/kg body mass | increase in relative lower-limb muscle strength | #5 |
usual care, additional protein intake, and supervised strength training for 18 weeks | increase | relative lower-limb muscle strength | women with obesity undergoing Roux-en-Y gastric bypass | +0.6 (0.3 to 0.8) kg/kg body mass | increase in relative lower-limb muscle strength was higher | #6 |
resistance training with additional protein intake | increase | Loss in muscle strength observed after bariatric surgery | - | - | can be overcome | #7 |
OBJECTIVE: Physical activity and dietary regimens to optimize health outcomes after bariatric surgery are not well known. This study aimed to determine whether resistance training with dietary protein supplementation is effective in maintaining body composition and physical fitness after obesity surgery. METHODS: Seventy-six women with obesity undergoing Roux-en-Y gastric bypass were randomly assigned at the time of surgery to receive either usual care (controls [CON], n = 22), usual care and additional (whey) protein intake (PRO, n = 31), or usual care, additional protein intake, and supervised strength training for 18 weeks (PRO+EX, n = 23). The primary outcome was pre- to 6-month postsurgery change in lean body mass (by dual-energy x-ray absorptiometry). Secondary outcomes included changes in muscle strength (by one-repetition maximum testing). RESULTS: Loss over time in lean body mass did not differ between groups (CON: mean,-8.8 kg; 95% CI: -10.1 to -7.5 kg; PRO: mean, -8.2 kg; 95% CI: -9.3 to -7.1 kg; PRO+EX: mean, -7.7 kg; 95% CI: -9.0 to -6.5 kg; P = 0.899). The increase in relative lower-limb muscle strength was higher in the PRO+EX group (+0.6 [0.3 to 0.8]) versus +0.1 (-0.1 to 0.4) and +0.2 (0.0 to 0.4) kg/kg body mass in CON and PRO groups, respectively (P = 0.021). CONCLUSIONS: Loss in muscle strength observed after bariatric surgery can be overcome by resistance training with additional protein intake.