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The study of soccer skill performance has 3 objectives. Objective 1 is to compare effects of coffeeberry (300mg) and placebo ingestion on dribbling speed and precision and passing and shooting speed and accuracy compared to placebo. 30 subjects will be assessed before dosing, after a 1 hr resting absorption period, and after simulated soccer match play. Of these 30, 20 subjects will proceed to Objective 2 (45 minutes of intense simulated soccer match play) and Objective 3 (repeated sprint activity continued until volitional fatigue).
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Coffeeberry beverage | Experimental | 300 mg Coffeeberry extract in 300 ml beverage |
|
| Color and flavor matched beverage | Placebo Comparator | 0 mg Coffeeberry extract in 300 ml flavor and color-matched beverage |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Coffeeberry beverage | Dietary Supplement | One exposure of 300 mg coffeeberry extract in a 300 ml flavored still beverage prior to exercise session |
|
| Measure | Description | Time Frame |
|---|---|---|
| Dribbling speed | m/sec, increase would be better. Simulated match in an indoor gym with pre-set targets. | During 3.5 hours post consumption |
| Dribbling precision | Meters, more accuracy would be better. Simulated match in an indoor gym against pre-set targets. | During 3.5 hours post consumption |
| Passing accuracy | 1-10 scale, higher score would be better. Simulated match in an indoor gym against pre-set targets. | During 3.5 hours post consumption |
| Passing speed by Time | km/h, increased would be better. Simulated match in an indoor gym against pre-set targets. | During 3.5 hours post consumption |
| Shooting accuracy | More shots on target would be better. Simulated match in an indoor gym against pre-set targets. | During 3.5 hours post consumption |
| Shooting speed | Milliseconds, faster would be better. Simulated match in an indoor gym against pre-set targets. | During 3.5 hours post consumption |
| Measure | Description | Time Frame |
|---|---|---|
| Sprint speed | m/sec, increase would be better. In indoor gym with marked course. | During 3.5 hours post consumption |
| High-intensity endurance running capacity | Run time to volitional fatigue in min, increase would be better. In indoor gym with marked course. |
| Measure | Description | Time Frame |
|---|---|---|
| Blood analyte concentration: Capillary glucose | (mmol/L), more regulated would be better | During 3.5 hours post consumption |
| Blood analyte concentration: Capillary lactate | (mmol/L), lower (delayed rise) would be better |
Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Stuart Galloway, PhD | U. Stirling | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| University of Stirling, Health Science and Sport | Stirling | Scotland | FK9 4LA | United Kingdom |
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| ID | Term |
|---|---|
| D009043 | Motor Activity |
| ID | Term |
|---|---|
| D001519 | Behavior |
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Double-blind
| Comparator beverage | Other | One 300 ml still beverage, color and flavor matched to experimental beverage prior to exercise session |
|
| During 3.5 hours post consumption |
| During 3.5 hours post consumption |
| Blood analyte concentration: Serum chlorogenic acid | (mmol/L), n.a. for placebo, introduced to evaluate primary outcomes | During 3.5 hours post consumption |
| Blood analyte concentration: Serum caffeine | (ug/mL), n.a. for placebo, Introduced to evaluate primary outcomes | During 3.5 hours post consumption |
| Rate of Perceived Exertion (RPE) | By Borg scale, rated 6-20, lower values would be better | During 3.5 hours post consumption |
| Activation/Deactivation (feelings and mood) | Checklist of feelings using a 4 point scale from definitely do to definitely don't feel, more relaxed and better mood would be better | During 3.5 hours post consumption |
| Mental energy | By Visual Analog Scale (VAS) vertical marking on 100 mm horizontal line, higher energy would be better | During 3.5 hours post consumption |
| Physical energy | By Visual Analog Scale (VAS) vertical marking on 100 mm horizontal line, higher energy would be better | During 3.5 hours post consumption |
| Heart rate | By electronic reading, lower would be better | During 3.5 hours post consumption |
| Gut comfort | By Visual Analog Scale (VAS) vertical marking on 100 mm horizontal scale, no or less nausa, fullness or bloating would be better | During 3.5 hours post consumption |
| Hydration status | Urine osmolality in mOsm/kg, comparing pre- vs. post-exercise concentration | During 3.5 hours post consumption |