Body Weight
Conditions
Keywords
Military Training, Whey Protein, Body Composition
Brief summary
The objectives of this study are to: 1) determine effects of a prototype recovery food product providing supplemental energy on whole-body protein balance, skeletal muscle mass, and biomarkers of physiological status and strain during winter military training, and 2) determine the extent to which varying macronutrient composition (protein-based \[PRO\] versus carbohydrate-based \[CHO\]) of the food product modulates the physiological consequences to strenuous military training.
Detailed description
Up to 120 Norwegian Soldiers from the 2nd Battalion, Brigade North, Norwegian Army stationed at Skjold Garrison will be enrolled in a 9-day, randomized controlled study. Using dietary analysis, body composition assessments, stable isotope methodologies, basic biochemical techniques, and measures of physiological strain, the effects of supplemental energy in the form of carbohydrate and protein on indices of muscle mass and physiological status will be assessed. We hypothesize that consuming supplemental energy will attenuate the effects of severe energy deficit on inflammation, androgenic hormones, and whole-body protein retention, thereby protecting skeletal muscle mass. We expect that consuming PRO will promote a more favorable recovery than consuming CHO, as indicated by measures of increased whole-body protein synthesis and greater conservation of skeletal muscle mass.
Interventions
DIETARY_SUPPLEMENTControl
DIETARY_SUPPLEMENTProtein
DIETARY_SUPPLEMENTCarbohydrate
Sponsors
United States Army Research Institute of Environmental Medicine
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
BASIC_SCIENCE
Masking
TRIPLE (Subject, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
* Male and female Norwegian Soldiers aged 18 years or older participating in the 4-day training program.
Exclusion criteria
* History of skin irritation (e.g., nickel or adhesive allergy), difficulty swallowing large pills, and allergies to dairy products
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Protein Balance | day 5 | Whole-body nitrogen balance |
| Lean Body Mass | day 5 | Body composition |
| Skeletal Muscle Mass | day 5 | Isotopic estimates of muscle protein mass |
| Body weight | day 5 | — |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Intestinal health | day 5 | Gut health |
| Thermal and Physiological Strain | average 6 days | Core and skin temperature, heart rate, respiration rate |
Countries
Norway, United States
Outcome results
None listed