Collagen Supplements and Post-MBS Muscle Mass/Body Image
Relationship Between Collagen-Containing Supplement Use and Muscle Mass and Body Image Following Metabolic and Bariatric Surgery: A Prospective Observational Study
This prospective, observational cohort study aims to evaluate whether the use of collagen-containing supplements is associated with differences in muscle mass, body composition, and body image among patients who have undergone sleeve gastrectomy (SG). The study will be conducted at the General Surgery outpatient clinic of a private hospital in Bursa, Türkiye, between May 2026 and March 2027, and will enroll adult patients (aged 18-65 years) who meet current ASMBS/IFSO eligibility criteria for metabolic and bariatric surgery.
Participants will be naturally allocated into two observational groups based on their own choice to use or not use collagen-containing supplements; no supplement will be provided or recommended by the study team, and no intervention will be made to participants' standard clinical care. All patients will be followed according to routine clinical practice preoperatively and at 2 weeks, 1 month, 3 months, and 6 months postoperatively.
Primary outcome measures include anthropometric parameters (body weight, BMI, fat mass, fat mass percentage, fat-free mass, muscle mass, percentage of weight loss, percentage of excess weight loss, waist and hip circumference) assessed via bioelectrical impedance analysis (Tanita MC-780 MA), and body image assessed using the Turkish-validated Body Shape Questionnaire (BSQ). Secondary outcomes include biochemical parameters, comorbidities, and macronutrient intake data obtained from 3-day dietary records analyzed using the BEBİS nutrition software.
The study hypothesizes that patients using collagen-containing supplements will show significant differences in muscle mass and body composition parameters compared with non-users, and that supplement use will be significantly associated with BSQ scores. A sample size of approximately 52 participants per group was calculated using G*Power 3.1 (one-way ANOVA, Cohen's f = 0.25, α = 0.05, power = 0.80).
Aperçu de l'étude
Statut
Statut
Les conditions
Les conditions
Intervention / Traitement
Intervention / Traitement
Type d'étude
Type d'étude
Inscription (Estimé)
Inscription
Contacts et emplacements
Coordonnées de l'étude
Coordonnées de l'étude
- Nom: Seher Şen, Assistant Professor
- Numéro de téléphone: +905393919700
- E-mail: seherdalli@gmail.com
Sauvegarde des contacts de l'étude
- Nom: Emre Şen, Master's degree graduate
- Numéro de téléphone: 0 532 163 30 87
Lieux d'étude
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Yıldırım
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Bursa, Yıldırım, Turquie (Türkiye)
- Recrutement
- Yıldırım Doruk Hastanesi
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Contact:
- Numéro de téléphone: 05393919700
- E-mail: seher.sen@mudanya.edu.tr
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-
Critères de participation
Critère d'éligibilité
Critère d'éligibilité
Âges éligibles pour étudier
- Adulte
- Adulte plus âgé
Accepte les volontaires sains
Méthode d'échantillonnage
Population étudiée
La description
Inclusion Criteria:
- Patients with a BMI ≥ 35 kg/m², regardless of the presence of comorbidities
- Patients with a BMI of 30-34.9 kg/m² who have an obesity-related metabolic disease and are considered eligible for surgical treatment
- Patients who have undergone metabolic and bariatric surgery (MBS) in accordance with current ASMBS/IFSO guidelines (Eisenberg et al., 2022)
- Patients under regular postoperative follow-up
- Age 18-65 years
Exclusion Criteria:
- Inflammatory bowel disease
- History of upper gastrointestinal bleeding
- Severe psychiatric disorders
- Active cancer diagnosis
- Pregnancy or breastfeeding
- Alcohol or substance dependence
- Physical limitations preventing participation in exercise
Plan d'étude
Comment l'étude est-elle conçue ?
Détails de conception
Nombre de groupes / cohortes
Cohortes et interventions
Groupe / CohorteGroupe / Cohorte |
Intervention / TraitementIntervention / Traitement |
|---|---|
|
1. Grup
Group/Cohort Label: Collagen Supplement Users (Kolajen Kullananlar) Description: Participants who, based on their own preference, use a collagen-containing supplement product following sleeve gastrectomy, without any intervention or recommendation from the study team.
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Collagen-containing supplement products used at the participants' own discretion following sleeve gastrectomy.
The type of product, daily dosage, and duration of use were self-reported by participants
|
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2. Grup
Group/Cohort Label: Non-Users of Collagen Supplement (Kolajen Kullanmayanlar) Description: Participants who do not use any collagen-containing supplement product following sleeve gastrectomy, followed under routine clinical care.
|
Que mesure l'étude ?
Principaux critères de jugement
Principaux critères de jugement
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
|
Change in Body Weight
Délai: Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
|
Body weight (kg) measured using a Tanita MC-780 MA device.
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Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
|
|
Change in Body Shape Questionnaire (BSQ) Score
Délai: Preoperative and postoperative 6 months
|
Body image concerns were assessed using the Body Shape Questionnaire (BSQ-34), a validated instrument for the Turkish population.
This 34-item self-report scale evaluates weight-related concerns and dissatisfaction with body shape over the preceding four weeks.
Each item is scored from 1 (never) to 6 (always), with a total score range of 34 to 204.
Higher scores indicate greater dissatisfaction with body shape, i.e., a worse outcome.
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Preoperative and postoperative 6 months
|
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Change in Body Mass Index (BMI)
Délai: Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
|
BMI calculated as body weight (kg) divided by height squared (m²).
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Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
|
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Percentage of Total Weight Loss (%TWL)
Délai: Postoperative and 6 months
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Calculated as (preoperative weight - postoperative weight) / preoperative weight × 100.
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Postoperative and 6 months
|
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Percentage of Excess Weight Loss (%EWL)
Délai: Postoperative and 6 months
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Calculated as (preoperative weight - postoperative weight) / (preoperative weight - ideal weight) × 100.
Ideal body weight was calculated assuming a BMI of 25 kg/m².
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Postoperative and 6 months
|
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Change in Fat Mass
Délai: Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
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Fat mass (kg) assessed by multi-frequency bioelectrical impedance analysis (BIA) using a Tanita MC-780 MA device.
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Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
|
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Change in Fat Mass Percentage
Délai: Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
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Fat mass expressed as a percentage of total body weight, assessed by bioelectrical impedance analysis (BIA) using a Tanita MC-780 MA device.
|
Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
|
|
Change in Muscle Mass
Délai: Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
|
Muscle mass (kg) assessed by bioelectrical impedance analysis (BIA) using a Tanita MC-780 MA device.
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Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
|
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Change in Muscle Mass Percentage
Délai: Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
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Muscle mass expressed as a percentage of total body weight, assessed by bioelectrical impedance analysis (BIA) using a Tanita MC-780 MA device.
|
Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
|
Mesures de résultats secondaires
Mesures de résultats secondaires
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
|
Change in Fasting Blood Glucose
Délai: Preoperative and 6 months
|
Fasting blood glucose (mg/dL) obtained from routine clinical laboratory follow-up.
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Preoperative and 6 months
|
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Change in Fasting Insulin
Délai: Preoperative and 6 months
|
Fasting insulin (µIU/mL) obtained from routine clinical laboratory follow-up.
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Preoperative and 6 months
|
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Change in HbA1c
Délai: Preoperative and 6 months
|
Glycated hemoglobin (HbA1c, %) obtained from routine clinical laboratory follow-up.
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Preoperative and 6 months
|
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Change in LDL Cholesterol
Délai: Preoperative and 6 months
|
LDL cholesterol (mg/dL) obtained from routine clinical laboratory follow-up.
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Preoperative and 6 months
|
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Change in HDL Cholesterol
Délai: Preoperative and 6 months
|
HDL cholesterol (mg/dL) obtained from routine clinical laboratory follow-up.
|
Preoperative and 6 months
|
|
Change in Triglycerides
Délai: Preoperative and postoperative 6 months
|
Triglycerides (mg/dL) obtained from routine clinical laboratory follow-up.
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Preoperative and postoperative 6 months
|
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Change in Total Cholesterol
Délai: Preoperative and postoperative 6 months
|
Total cholesterol (mg/dL) obtained from routine clinical laboratory follow-up.
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Preoperative and postoperative 6 months
|
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Change in ALT
Délai: Preoperative and 6 months
|
Alanine aminotransferase (ALT, U/L) obtained from routine clinical laboratory follow-up.
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Preoperative and 6 months
|
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Change in AST
Délai: Preoperative and 6 months
|
Aspartate aminotransferase (AST, U/L) obtained from routine clinical laboratory follow-up.
|
Preoperative and 6 months
|
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Change in Uric Acid
Délai: Preoperative and 6 months
|
Uric acid (mg/dL) obtained from routine clinical laboratory follow-up.
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Preoperative and 6 months
|
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Change in Urea
Délai: Preoperative and 6 months
|
Urea (mg/dL) obtained from routine clinical laboratory follow-up.
|
Preoperative and 6 months
|
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Change in Hemoglobin
Délai: Preoperative and 6 months
|
Hemoglobin (g/dL) obtained from routine clinical laboratory follow-up.
|
Preoperative and 6 months
|
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Change in Hematocrit
Délai: Preoperative and 6 months
|
Hematocrit (%) obtained from routine clinical laboratory follow-up.
|
Preoperative and 6 months
|
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Change in Ferritin
Délai: Preoperative and 6 months
|
Ferritin (ng/mL) obtained from routine clinical laboratory follow-up.
|
Preoperative and 6 months
|
|
Change in Serum Iron
Délai: Preoperative and 6 months
|
Serum iron (µg/dL) obtained from routine clinical laboratory follow-up.
|
Preoperative and 6 months
|
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Change in Vitamin B12
Délai: Preoperative and 6 months
|
Vitamin B12 (pg/mL) obtained from routine clinical laboratory follow-up.
|
Preoperative and 6 months
|
|
Change in Folic Acid
Délai: Preoperative and 6 months
|
Folic acid (ng/mL) obtained from routine clinical laboratory follow-up.
|
Preoperative and 6 months
|
|
Change in Magnesium
Délai: Preoperative and 6 months
|
Magnesium (mg/dL) obtained from routine clinical laboratory follow-up.
|
Preoperative and 6 months
|
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Change in Total Calcium
Délai: Preoperative and 6 months
|
Total calcium (mg/dL) obtained from routine clinical laboratory follow-up.
|
Preoperative and 6 months
|
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Change in Serum Sodium
Délai: Preoperative and 6 months
|
Serum sodium (mEq/L) obtained from routine clinical laboratory follow-up.
|
Preoperative and 6 months
|
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Change in Serum Potassium
Délai: Preoperative and 6 months
|
Serum potassium (mEq/L) obtained from routine clinical laboratory follow-up.
|
Preoperative and 6 months
|
Collaborateurs et enquêteurs
Parrainer
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Dates d'enregistrement des études
Dates principales de l'étude
Début de l'étude (Réel)
Début de l'étude
Achèvement primaire (Estimé)
Achèvement primaire
Achèvement de l'étude (Estimé)
Achèvement de l'étude
Dates d'inscription aux études
Première soumission
Première soumission
Première soumission répondant aux critères de contrôle qualité
Première soumission répondant aux critères de contrôle qualité
Première publication (Réel)
Première publication
Mises à jour des dossiers d'étude
Dernière mise à jour publiée (Réel)
Dernière mise à jour publiée
Dernière mise à jour soumise répondant aux critères de contrôle qualité
Dernière mise à jour soumise répondant aux critères de contrôle qualité
Dernière vérification
Dernière vérification
Plus d'information
Termes liés à cette étude
Termes MeSH pertinents supplémentaires
Autres numéros d'identification d'étude
Autres numéros d'identification d'étude
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Plan pour les données individuelles des participants (IPD)
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Description du régime IPD
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