Due to its mechanical and metabolic functions, muscle loss leads to resistance to weight loss during caloric restriction, particularly in patients with obesity. The recent discovery of a "gravitational" homeostatic system, induced by an additional load to body weight, suggests the existence of a new weight control mechanism. Such a "gravitostat" would ensure a form of weight homeostasis mediated by afferent signals originating from osteocytes in response to gravity perception. This hypothesis, initially derived from animal studies, has more recently been tested in humans. It shows that "activation of the gravitostat" through artificial increases in body weight facilitates body weight reduction without affecting lean mass (LM). Therefore, this "gravitostat" could contribute to preserving LM despite the loss of fat mass , whereas its decline may compromise muscle mass and function after bariatric surgery, despite undeniable improvements in comorbidities. The present study aims to reduce the "metabolic load" (i.e., decreasing insulin resistance and inflammation) to promote muscle protein anabolism, while maintaining the "mechanical load" (by preserving initial body weight during weight loss induced by bariatric surgery) in order to activate the "gravitostat" and preserve muscle mass and function. Currently, there are no clear recommendations or strategies to prevent muscle loss in patients who have undergone bariatric surgery. This simple concept, applied during drastic muscle loss, should help improve muscle health.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
NONE
Enrollment
40
The method for maintaining mechanical load (artificially reproducing the stabilization of initial body weight) will involve the use of a weighted vest. Participants will be asked to wear the weighted vest for at least eight hours a day over a four-week period without changing their lifestyle. Patients will also be contacted by phone every week after surgery to confirm that they are using the vest in accordance with the protocol and to collect information on any potential adverse events. During these calls, weight adjustments-based on body weight changes-will be discussed with the patient and regularly recorded to stay as close as possible to the initial body weight, with a tolerance of ±1 kg. However, the maximum weight of the vest will not exceed 15% of the patient's initial weight (weight at the time of surgery). Between the 4th and 12th week, patients will be asked to wear the weighted vest loaded with the "weight lost" calculated at week 4 for at least four hours per day.
CHU Clermont-Ferrand
Clermont-Ferrand, France
Loss of lean mass at 1 monts and 3 months after bariatric surgery in patients undergoing "weight compensation" compared to a group of patients following a conventional approach (without gravitostat activation).
lean mass measurement with dual energy x-ray absorptiometry, DXA
Time frame: 1 month and 3 months after bariatric surgery
Loss of lean mass at 6 months after bariatric surgery in patients undergoing "weight compensation" compared to a group of patients following a conventional approach (without gravitostat activation).
lean mass measurement with dual energy x-ray absorptiometry, DXA
Time frame: 6 months after bariatric surgery
Change from baseline on weight at 1 month (M1), 3 months (M3), and 6 months (M6)
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Change from baseline on BMI at 1 month (M1), 3 months (M3), and 6 months (M6)
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Change from baseline on waist circumference at 1 month (M1), 3 months (M3), and 6 months (M6)
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Change from baseline on hip circumference at 1 month (M1), 3 months (M3), and 6 months (M6)
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Muscle mass in the arms and legs at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Changes in muscle function (Handgrip strength test) at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Changes in muscle function (Short Physical Performance Battery (SPPB)) at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Changes in muscle function (6-minute walk test (TM6)) at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Changes from baseline on muscle architechture at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery
Analysis of muscle architecture and lipid infiltration using muscle ultrasound
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Changes from baseline on bone architechture at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery
Analysis of bone mineral density (BMD) of trabecular and cortical bone compartments using peripheral quantitative computed tomography (PQCT)
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Changes from baseline on bone architecture at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery
Analysis of bone strength of trabecular and cortical bone compartments using peripheral quantitative computed tomography (PQCT)
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Changes from baseline on bone architecture at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery
Analysis of geometric parameters (volume, air) of trabecular and cortical bone compartments using peripheral quantitative computed tomography (PQCT)
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Change from baseline on blood glucose at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Change from baseline on cholesterol at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Change from baseline on triglycerides at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Change from baseline on insulin levels at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Change from baseline on CRP at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Change from baseline on urinary creatinine at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Effect of weight compensation at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery on Plasma, serum, and urinary biomarkers
Biological collection
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Effect on Maximal strength
Effect of weight compensation at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery on maximum strenght (isokinetic dynamometry)
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Effect on Food intake
Effect of weight compensation at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery on Food intake (nutrient intake using the "Nutrilog" software)
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Effect of weight compensation at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery on Nitrogen balance
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Effect on Quality of life using a visual analog scale
Effect of weight compensation at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery on Quality of life using a visual analog scale
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Effect on Food preferences and reward
Effect of weight compensation at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery on Food preferences and reward by using LFPQ (Leeds Food Preference Questionnaire)
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
To assess the effect of weight compensation at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery on energy expenditure
Energy expenditure (resting and total)
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Effect on substrate utilization during an incremental submaximal walking exercise at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery on energy expenditure
Evaluate the use of energy substrates through the oxidation of carbohydrates and lipids an incremental submaximal walking exercise using in indirect calorimetry.
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Effect on perceived exertion during an exercise (Borg scale)
Effect of weight compensation at 1 month (M1), 3 months (M3), and 6 months (M6) after surgery on perceived exertion during an incremental submaximal walking exercise
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Effect of heart rate
During an incremental submaximal walking exercise
Time frame: 1 month (M1), 3 months (M3), and 6 months (M6)
Effect of weight compensation on spontaneous physical activity using accelerometry
Effect of weight compensation on spontaneous physical activity (sedentary, low, moderate and intense) per day (min/d) at baseline, on day 4 or the day after returning home following surgery, and then at 1 month (M1) and 3 months (M3) after surgery.
Time frame: on day 4 or the day after returning home following surgery, and then at 1 month (M1) and 3 months (M3) after surgery.
Study the longitudinal evolution of weight every week until M1, then every 2 weeks until M3 for the experimental group.
Time frame: every week until 1st month, then every 2 weeks until 3rd month after bariatric surgery
Study the longitudinal evolution of BMI every week until M1, then every 2 weeks until M3 for the experimental group.
Time frame: every week until 1st month, then every 2 weeks until 3rd month after bariatric surgery
Tolerance with wearing the vest for the experimental group
Tolerance with wearing the vest for the experimental group, using a patient diary.
Time frame: from bariatric surgery to the end at 3 months
Compliance with wearing the vest for the experimental group
Compliance with wearing the vest for the experimental group, using a patient diary.
Time frame: from bariatric surgery to the end at 3 months
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