Does Protein and Polyphenol Supplementation Augment Adaptations to 30 Sessions of Resistance Exercise Training in Healthy Males and Females Compared to an Isoenergetic Placebo Supplement?
Trial Snapshot
- Phase
- Not Applicable
- Status
- Completed
- Sponsor
- University of Exeter
- Enrollment
- 32
- Locations
- 1
- Primary Endpoint
- Change in cross-sectional area of quadriceps muscle group
Study Overview
Brief Summary
Chronic resistance training has been shown to increase muscle cross-sectional area, volume and strength. Individuals participating in a resistance training program may wish to consume protein supplements to aid recovery and maximise adaptation. Furthermore, antioxidants have been shown to aid recovery from acute bouts of exercise. However, the effect of antioxidants combined with protein on long term-training adaptation is not fully understood.
This study will combine measures of muscle size, muscle strength and function, and the underlying changes in muscle metabolism in order to assess the effect of consuming a combined protein-antioxidant supplement during a 30 session resistance training program.
Detailed Description
Supplemental protein ingestion is an established method for augmenting gains in fat free mass, muscle strength and muscle cross sectional area following a period of resistance exercise training. In addition to protein, supplements high in polyphenols such as berry and pomegranate extract are believed to be an effective method of reducing soreness and facilitating recovery following a single bout of resistance exercise.
However, whilst polyphenols are shown to facilitate recovery from a single session of resistance exercise, their effect on adaptations to repeated bouts of resistance exercise are unknown. Asking this question will allow a detailed investigation of the mechanisms by which protein-polyphenol ingestion may affect adaptations to resistance exercise training when compared to a non protein or polyphenol containing placebo, which is an important yet underexplored area
Study Design
- Study Type
- Interventional
- Allocation
- Randomized
- Intervention Model
- Parallel
- Primary Purpose
- Basic Science
- Masking
- Triple (Participant, Investigator, Outcomes Assessor)
Eligibility Criteria
- Ages
- 18 Years to 40 Years (Adult)
- Sex
- All
- Accepts Healthy Volunteers
- Yes
Inclusion Criteria
- •Male and Female
- •18 - 40 years of age
- •Recreationally active
Exclusion Criteria
- •Any diagnosed metabolic impairment (e.g. type 1 or 2 Diabetes). Such impairments can affect skeletal muscle metabolism
- •Any diagnosed cardiovascular disease or hypertension
- •Use of nutritional supplements (e.g. protein, polyphenols, vitamins, antioxidants) as use of nutritional supplements during the study period may interfere with the physiological responses to the supplements of interest administered in this study.
- •Habitual dietary protein intake <0.8 g/kg/day or >1.6 g/kg/day as calculated with a three day diet diary. Habitually low protein may impair adaptations to resistance exercise training and a habitually excessive protein intake may negate the benefit of protein supplementation.
- •Current musculoskeletal injury that may impair exercise performance or may be exacerbated due to this studies exercise protocol.
- •Resistance trained (participating in structured resistance exercise 3 or more times per week for >6 months), endurance trained (participating in structured endurance exercise for >6h per week for >6 months), or sedentary participants as these are not the populations of interest.
- •Chronic use of anti-inflammatory medicines prior to the study and unwillingness to refrain from taking anti-inflammatory medications during the study as these medications may affect skeletal muscle metabolism and/or adaptation to exercise.
- •Individuals who carry an epi-pen, or those with a diagnosed allergy or who believe that they have an allergy to milk or milk products, crustacean shellfish, tree nuts, or peanuts
- •Individuals with a severe allergy to egg, fish, wheat or soy ingredients as the product is manufactured in a facility that contains these ingredients
- •Individuals with non removable metallic implants (including heart pacemaker, cochlea implants, medication pumps, surgical clips, plates or screws) or claustrophobia
Arms & Interventions
Placebo
Placebo beverage
Intervention: Placebo beverage (Dietary Supplement)
Protein-Polyphenol supplement
Protein-polyphenol beverage
Intervention: Protein-polyphenol beverage (Dietary Supplement)
Outcomes
Primary Outcomes
Change in cross-sectional area of quadriceps muscle group
Time Frame: After 30 training sessions (approx. 10 weeks)
The cross-sectional area of the muscles comprising the thigh after 30 training sessions will be compared to pre-training values. This will be measured using MRI.
Secondary Outcomes
- Change in quadriceps muscle group volume(After 30 training sessions (approx. 10 weeks))
- Change in knee extensor isokinetic total work(After 30 training sessions (approx. 10 weeks))
- Perceived quadriceps muscle soreness:(After 30 training sessions (approx. 10 weeks))
- Change in maximal isokinetic peak torque(After 30 training sessions (approx. 10 weeks))
- Change in muscle protein synthesis assessed using the stable isotope Deuterium Oxide(After 30 training sessions (approx. 10 weeks))
- Change in maximal isometric peak torque(After 30 training sessions (approx. 10 weeks))