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).
Descripción general del estudio
Estado
Estado
Condiciones
Condiciones
Intervención / Tratamiento
Intervención / Tratamiento
Tipo de estudio
Tipo de estudio
Inscripción (Estimado)
Inscripción
Contactos y Ubicaciones
Estudio Contacto
Estudio Contacto
- Nombre: Seher Şen, Assistant Professor
- Número de teléfono: +905393919700
- Correo electrónico: seherdalli@gmail.com
Copia de seguridad de contactos de estudio
- Nombre: Emre Şen, Master's degree graduate
- Número de teléfono: 0 532 163 30 87
Ubicaciones de estudio
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Yıldırım
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Bursa, Yıldırım, Turquía (Türkiye)
- Reclutamiento
- Yıldırım Doruk Hastanesi
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Contacto:
- Número de teléfono: 05393919700
- Correo electrónico: seher.sen@mudanya.edu.tr
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Criterios de participación
Criterio de elegibilidad
Criterio de elegibilidad
Edades elegibles para estudiar
- Adulto
- Adulto Mayor
Acepta Voluntarios Saludables
Método de muestreo
Población de estudio
Descripción
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 de estudios
¿Cómo está diseñado el estudio?
Detalles de diseño
Número de grupos/cohortes
Cohortes e Intervenciones
Grupo / CohorteGrupo / Cohorte |
Intervención / TratamientoIntervención / Tratamiento |
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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.
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¿Qué mide el estudio?
Medidas de resultado primarias
Medidas de resultado primarias
Medida de resultado |
Medida Descripción |
Periodo de tiempo |
|---|---|---|
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Change in Body Weight
Periodo de tiempo: Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
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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
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Change in Body Shape Questionnaire (BSQ) Score
Periodo de tiempo: Preoperative and postoperative 6 months
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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)
Periodo de tiempo: Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
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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)
Periodo de tiempo: 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)
Periodo de tiempo: 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
Periodo de tiempo: 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
Periodo de tiempo: 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.
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Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
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Change in Muscle Mass
Periodo de tiempo: Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
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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
Periodo de tiempo: 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.
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Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months
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Medidas de resultado secundarias
Medidas de resultado secundarias
Medida de resultado |
Medida Descripción |
Periodo de tiempo |
|---|---|---|
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Change in Fasting Blood Glucose
Periodo de tiempo: Preoperative and 6 months
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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
Periodo de tiempo: Preoperative and 6 months
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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
Periodo de tiempo: Preoperative and 6 months
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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
Periodo de tiempo: Preoperative and 6 months
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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
Periodo de tiempo: Preoperative and 6 months
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HDL cholesterol (mg/dL) obtained from routine clinical laboratory follow-up.
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Preoperative and 6 months
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Change in Triglycerides
Periodo de tiempo: Preoperative and postoperative 6 months
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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
Periodo de tiempo: Preoperative and postoperative 6 months
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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
Periodo de tiempo: Preoperative and 6 months
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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
Periodo de tiempo: Preoperative and 6 months
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Aspartate aminotransferase (AST, U/L) obtained from routine clinical laboratory follow-up.
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Preoperative and 6 months
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Change in Uric Acid
Periodo de tiempo: Preoperative and 6 months
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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
Periodo de tiempo: Preoperative and 6 months
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Urea (mg/dL) obtained from routine clinical laboratory follow-up.
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Preoperative and 6 months
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Change in Hemoglobin
Periodo de tiempo: Preoperative and 6 months
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Hemoglobin (g/dL) obtained from routine clinical laboratory follow-up.
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Preoperative and 6 months
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Change in Hematocrit
Periodo de tiempo: Preoperative and 6 months
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Hematocrit (%) obtained from routine clinical laboratory follow-up.
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Preoperative and 6 months
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Change in Ferritin
Periodo de tiempo: Preoperative and 6 months
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Ferritin (ng/mL) obtained from routine clinical laboratory follow-up.
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Preoperative and 6 months
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Change in Serum Iron
Periodo de tiempo: Preoperative and 6 months
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Serum iron (µg/dL) obtained from routine clinical laboratory follow-up.
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Preoperative and 6 months
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Change in Vitamin B12
Periodo de tiempo: Preoperative and 6 months
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Vitamin B12 (pg/mL) obtained from routine clinical laboratory follow-up.
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Preoperative and 6 months
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Change in Folic Acid
Periodo de tiempo: Preoperative and 6 months
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Folic acid (ng/mL) obtained from routine clinical laboratory follow-up.
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Preoperative and 6 months
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Change in Magnesium
Periodo de tiempo: Preoperative and 6 months
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Magnesium (mg/dL) obtained from routine clinical laboratory follow-up.
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Preoperative and 6 months
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Change in Total Calcium
Periodo de tiempo: Preoperative and 6 months
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Total calcium (mg/dL) obtained from routine clinical laboratory follow-up.
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Preoperative and 6 months
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Change in Serum Sodium
Periodo de tiempo: Preoperative and 6 months
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Serum sodium (mEq/L) obtained from routine clinical laboratory follow-up.
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Preoperative and 6 months
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Change in Serum Potassium
Periodo de tiempo: Preoperative and 6 months
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Serum potassium (mEq/L) obtained from routine clinical laboratory follow-up.
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Preoperative and 6 months
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Colaboradores e Investigadores
Patrocinador
Patrocinador
Fechas de registro del estudio
Fechas importantes del estudio
Inicio del estudio (Actual)
Inicio del estudio
Finalización primaria (Estimado)
Finalización primaria
Finalización del estudio (Estimado)
Finalización del estudio
Fechas de registro del estudio
Enviado por primera vez
Enviado por primera vez
Primero enviado que cumplió con los criterios de control de calidad
Primero enviado que cumplió con los criterios de control de calidad
Publicado por primera vez (Actual)
Publicado por primera vez
Actualizaciones de registros de estudio
Última actualización publicada (Actual)
Última actualización publicada
Última actualización enviada que cumplió con los criterios de control de calidad
Última actualización enviada que cumplió con los criterios de control de calidad
Última verificación
Última verificación
Más información
Términos relacionados con este estudio
Términos MeSH relevantes adicionales
Otros números de identificación del estudio
Otros números de identificación del estudio
- MUDU-SBE-SS-05
Plan de datos de participantes individuales (IPD)
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Descripción del plan IPD
Información sobre medicamentos y dispositivos, documentos del estudio
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