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This study is designed to investigate whether protein supplementation can improve recovery of muscle function following a strenuous combination of both endurance and resistance exercise. It will specifically investigate the effect of protein supplementation on the recovery of strength, power and endurance exercise performance, along with measures of damage and inflammation of the muscle.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Test product | Experimental | One ready-to-drink beverage of 500 milliliter (mL) volume, containing 20 gram (g) protein will be administered orally, twice daily for four days. |
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| Reference product 1 | Active Comparator | One ready-to-drink beverage of 500 mL volume, containing 20 g carbohydrate will be administered orally, twice daily for four days. |
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| Reference product 2 | Placebo Comparator | One ready-to-drink beverage of 500 mL volume, containing 0 g carbohydrate will be administered orally, twice daily for four days. |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Test product | Dietary Supplement | Whey protein hydrolysate (20 g) |
| |
| Measure | Description | Time Frame |
|---|---|---|
| Isometric Maximal Voluntary Contraction (MVC) Assessment | Maximum voluntary isometric contraction (MVIC) will be assessed at the knee during a leg extension movement using an isokinetic dynamometer. MVIC will be used to assess strength. Participants will perform the exercise using the dominant leg at a knee joint angle of 70ยบ three times, with a contraction of 3 seconds (s) on each occasion (each contraction separated by 60 s rest). The peak force (measured in Newton) generated across the three repetitions will be recorded. | 96 hours (h) |
| Counter Movement Jump (CMJ) Assessment | Power will be assessed using counter-movement jump. Participants will place their hands on their hips, descend rapidly to ~90ยบ knee joint angle, and then jump as high as possible using a counter-movement. Three jumps will be performed (each jump separated by 60 s rest) and the peak vertical jump height (measured in centimeters) will be recorded. | 96 h |
| 16.1 Kilometer (km) Cycling Time Trial (TT) Assessment | The 16.1 km cycling TT assessment will be performed on a cycling ergometer. Participants will be required to complete a distance of 16.1 km in as short a time as possible, while being blinded to time elapsed. | 96 h |
| Measure | Description | Time Frame |
|---|---|---|
| Serum Creatine Kinase Analysis | Muscle damage will be assessed by analyzing serum creatine kinase (CK) using CK N-Acetyl-L Cysteine (NAC)-activated Enzyme Linked Immunosorbent Assay (ELISA). | 96 h |
| Serum C-Reactive Protein Analysis |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| GSK Clinical Trials | GlaxoSmithKline | Study Director |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| GSK Investigational Site | Brentford | TW8 9 DA | United Kingdom |
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| Reference product 1 |
| Dietary Supplement |
Iso-energetic carbohydrate (20 g) |
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| Reference product 2 | Dietary Supplement | Negligible energy placebo (20 g) |
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Muscle inflammation will be assessed by analyzing serum high sensitivity (hs) C-reactive protein (CRP) using hs-CRP ELISA.
| 96 h |
| Perceived Muscle Soreness Assessment | Perceived muscle soreness will be measured on a 200 mm visual analogue scale (VAS) where 0 mm= no pain and 200 mm= unbearably painful. Participants will be required to hold a fixed squat position (90ยบ knee joint angle) while perceived muscle soreness is rated. | 96 h |