Brock Exercise And Supplement Trials
- Conditions
- HealthyUntrained
- Interventions
- Behavioral: Resistance and Plyometric ExerciseDietary Supplement: Greek Yogurt (0% Plain)Dietary Supplement: Placebo - Study Designed Supplement
- Registration Number
- NCT03196856
- Lead Sponsor
- Brock University
- Brief Summary
This study will analyze the effects of Greek yogurt consumption and an 12 week exercise intervention on muscle size, body composition and bone health in untrained, university-aged males.
- Detailed Description
Introduction: Previous research has shown the effectiveness of dairy milk and whey protein on increasing muscle size, optimizing body composition and increasing strength in adult males. However, evidence on the use of high protein/Greek yogurt on muscle size, body composition and bone health is limited in this population. Yogurt contains similar muscle and bone supporting nutrients as milk, yet it offers a host of additional benefits including; increased satiety, probiotic cultures, greater stability, increased variety, more affordable and versatile features such as acting as a vehicle for consumption of other healthful foods. The proposed research will investigate the use of Greek yogurt as an effective post-exercise food to promote healthy body composition and bone health changes in young adult males.
Design: Parallel, randomized controlled trial.
Participants: 30 (n=15 YOG, n=15 PLA) healthy, untrained university-aged males.
Methods: Subjects will undergo a 12-week resistance and plyometric training program (exercising 3 days/week). The YOG group will consume a 200g dose (pro= 20g, carbs= 8 grams, \~110 kcals) of plain 0% Greek yogurt, while the PLA group will consume an isoenergetic, protein-void beverage comprised mainly of maltodextrin (pro= 0g, carbs= 26g, \~110 kcals). Each group will consume 3 doses per day (immediately and 1 hour post-exercise, and bedtime). Markers of bone health (CTx and P1NP) will be taken at baseline, 1 week and 12 weeks to determine acute and total changes. Muscle size, body composition, strength, vertical jump height and nutritional diaries will be measured pre and post intervention and habitual diet maintenance will be encouraged throughout the intervention.
Anticipated Results: It is hypothesized that each group will undergo positive changes in the aforementioned measures, however due to the increase in protein and calcium consumption, the yogurt group is predicted to have significantly greater increases in these variables than the placebo group.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- Male
- Target Recruitment
- 30
- Male
- Age 18-25 years
- Normal BMI (18.5-24.9) kg/m2
- Have not participated in a resistance training program (of resistance exercise at least 2x/week or more) in the last 6 months
- Healthy and not taking any medication affecting muscle or bone
- Not supplementing with vitamins/ minerals or protein
- Speak and understand English
- No dairy allergy or lactose intolerance
Not provided
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- PARALLEL
- Arm && Interventions
Group Intervention Description Yogurt Group Resistance and Plyometric Exercise Group will be consuming 200g of Greek Yogurt (Plain, 0%) 3 times daily for 12 weeks Yogurt Group Greek Yogurt (0% Plain) Group will be consuming 200g of Greek Yogurt (Plain, 0%) 3 times daily for 12 weeks Study Designed Supplement Group Placebo - Study Designed Supplement Group will consume an isoenergetic, protein void, maltodextrin-based placebo supplement during the same time points for 12 weeks as well. The Placebo contain maltodextrin and pudding powder to mimic the consistency of Greek yogurt. Study Designed Supplement Group Resistance and Plyometric Exercise Group will consume an isoenergetic, protein void, maltodextrin-based placebo supplement during the same time points for 12 weeks as well. The Placebo contain maltodextrin and pudding powder to mimic the consistency of Greek yogurt.
- Primary Outcome Measures
Name Time Method Muscle Size Change from Baseline to 12 weeks Muscle Size determined by ultrasound at various sites.
Muscular Strength Change from Baseline to 12 weeks 1 Repetition Maximum of bench press, seated row, quad extension and hamstring curl
Body Composition Change from Baseline to 12 weeks Body Fat % measured via BodPod and BodyMetrix
- Secondary Outcome Measures
Name Time Method Vertical Jump Height Change from Baseline to 12 weeks measured via chalk-on-wall technique
Bone cell activity Change from Baseline to 12 weeks Bone markers measured in serum.
Trial Locations
- Locations (1)
Brock University
🇨🇦St. Catharines, Ontario, Canada