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| Name | Class |
|---|---|
| University of Exeter | OTHER |
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Load carriage is a common military activity and has been shown to induce acute exercise-induced muscle damage (EIMD) and impair muscle function. Protein supplementation can accelerate muscle recovery by attenuating EIMD and muscle function loss. This study investigated the impact of an additional daily bolus of protein prior to sleep throughout training on acute muscle recovery following a load carriage test in British Army recruits. Muscle function (maximal jump height), perceived muscle soreness and urinary markers of muscle damage were assessed before (PRE), immediately post (POST), 24-hours post (24h-POST) and 40-hours post (40h-POST) a load carriage test.
British Army basic training (BT) is physically demanding with new recruits completing multiple bouts of physical activity each day with limited recovery. Load carriage is one of the most physically demanding BT activities and has been shown to induce acute exercise-induced muscle damage (EIMD) and impair muscle function. Protein supplementation can accelerate muscle recovery by attenuating EIMD and muscle function loss. This study investigated the impact of an additional daily bolus of protein prior to sleep throughout training on acute muscle recovery following a load carriage test in United Kingdom (UK) British Army recruits. A mixed group (men/women) over over 120 new recruits were randomised to dietary control (CON), carbohydrate placebo (PLA), moderate (20g; MOD) or high (60g; HIGH) protein supplementation. Muscle function (maximal jump height), perceived muscle soreness and urinary markers of muscle damage were assessed before (PRE), immediately post (POST), 24-hours post (24h-POST) and 40-hours post (40h-POST) a load carriage test. The underlying aim of this study was to assess whether additional protein intake could attenuate aspects of muscle damage from an acute load carriage test including muscle function, muscle soreness and biomarkers of muscle damage during short term recovery.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| High protein intake supplementation | Experimental | A 60g daily dose of whey protein supplementation |
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| Moderate protein intake supplementation | Experimental | A 20g dose of whey protein supplementation |
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| Carbohydrate placebo | Placebo Comparator | An isocaloic maltodextrin carbohydrate placebo |
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| Control group, no supplementation | Other | Control group, not taking any supplementation, only completing basic training activities |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| High protein intake | Dietary Supplement | The participants received a 60g whey protein bolus each evening prior to sleep pre and post a military load carriage test. |
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| Measure | Description | Time Frame |
|---|---|---|
| Change in lower body muscle function | The change in maximal vertical jump height in participants before and after the load carriage test | 40-hours |
| Measure | Description | Time Frame |
|---|---|---|
| The change in urinary myoglobin | The relative change in concentration of urinary myoglobin (ng/ml) in participants before and after the load carriage test | 40-hours |
| The change in urinary 3-methylhistidine |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Justin D Roberts, PhD | Anglia Ruskin University | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Anglia Ruskin University | Cambridge | Cambridgeshire | CB1 1PT | United Kingdom |
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| ID | Term |
|---|---|
| D063806 | Myalgia |
| ID | Term |
|---|---|
| D009135 | Muscular Diseases |
| D009140 | Musculoskeletal Diseases |
| D009468 | Neuromuscular Diseases |
| D009422 | Nervous System Diseases |
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| Moderate protein intake | Dietary Supplement | The participants received a 20g whey protein bolus each evening prior to sleep pre and post a military load carriage test. |
|
| Carbohydrate maltodextrin placebo | Dietary Supplement | The participants received an isocaloric carbohydrate bolus each evening prior to sleep pre and post a military load carriage test. |
|
| Control no supplementation | Other | Control group, no supplementation, only basic training |
|
The relative change in concentration of urinary 3-methylhistidine (nmol/ml) in participants before and after the load carriage test
| 40-hours |
| The change in perceived muscle soreness | The relative change in perceived muscle soreness assessed via visual analogue scale. The participants were asked to record their perceived muscle soreness using a 0-10 Likert scale (e.g., 0=no pain, 10=severe pain that limits the ability to move). | 40-hours |
| D059352 | Musculoskeletal Pain |
| D010146 | Pain |
| D009461 | Neurologic Manifestations |
| D012816 | Signs and Symptoms |
| D013568 | Pathological Conditions, Signs and Symptoms |