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This study of soccer skill performance has three objectives:
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Coffeeberry beverage | Experimental | 300 ml drink containing 300 mg coffeeberry extract |
|
| Color and flavor matched beverage | Placebo Comparator | 300 ml drink (0 mg coffeeberry extract, 0 mg caffeine) |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Beverage | Other | Free from added carbohydrates (contain 1g CHO only) and electrolytes are absent. |
|
| Measure | Description | Time Frame |
|---|---|---|
| Dribbling speed | m/sec, increase would be better. Simulated soccer match in an indoor gym with pre-set targets. | Change from pre-dose baseline through end of match 3.5 hours post consumption at multiple intervals each half of match |
| Dribbling precision | Meters, more accuracy would be better. Simulated soccer match in an indoor gym with pre-set targets. | Change from pre-dose baseline through end of match 3.5 hours post consumption at multiple intervals each half of match |
| Passing accuracy | 1 to 10 scale, a higher score would be better. Simulated soccer match in an indoor gym with pre-set targets. | Change from pre-dose baseline through end of match 3.5 hours post consumption at multiple intervals each half of match. |
| Passing speed | km/h, increased passing speed would be better. Simulated soccer match in an indoor gym with pre-set targets. | Change from pre-dose baseline through end of match 3.5 hours post consumption at multiple intervals each half of match |
| Sprint speed. | m/sec, increased sprint speed would be better. In indoor gym with marked course. | Change from pre-dose baseline through end of match 3.5 hours post consumption at multiple intervals each half of match |
| Measure | Description | Time Frame |
|---|---|---|
| Blood analyte: Chlorogenic acid (CGA) | mmol/L to evaluate primary outcomes. n.a. for placebo. Capillary blood draw for frozen plasma analysis | Pre-dose baseline, 60 minutes post-dose, half-time, and end of match (3.5 hours) |
| Blood analyte: Caffeine metabolites |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Stuart Galloway, PhD | U. Stirling, Scotland | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| U. 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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| ID | Term |
|---|---|
| D001628 | Beverages |
| ID | Term |
|---|---|
| D000066888 | Diet, Food, and Nutrition |
| D010829 | Physiological Phenomena |
| D019602 | Food and Beverages |
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ug/ml, to evaluate primary outcomes. n.a. for placebo. Capillary blood draw for frozen plasma analysis |
| Pre-dose baseline, 60 minutes post-dose, half-time, and end of match (3.5 hours) |
| Blood analyte: Glucose | mmol/L, more regulated would be better. Capillary blood draw for frozen plasma analysis | Pre-dose baseline, 60 minutes post-dose, half-time, and end of match (3.5 hours) |
| Blood analyte: Lactate | mmol/L, lower (delayed rise) would be better. Capillary blood draw for frozen plasma analysis | Pre-dose baseline, 60 minutes post-dose, half-time, and end of match (3.5 hours) |
| Rating of perceived exertion (RPE) | By Borg scale, rated 6 to 20, very very light to very very hard. Lower values would be better | Half-time and end of match (3.5 hours) |
| Activation-deactivation (feelings or mood) | Checklist of 20 feelings using a 4 point scale from definitely do feel to definitely don't feel. More relaxed feelings or in a better mood would be better. | Pre-dose baseline, 60 minutes post-dose, half-time, and end of match (3.5 hours) |
| Mental energy | Visual Analog Scale (VAS), vertical marking on 100 mm horizontal line. Higher energy would be better | Pre-dose baseline, 60 minutes post-dose, half-time, and end of match (3.5 hours) |
| Physical energy | Visual Analog Scale (VAS), vertical marking on 100 mm horizontal line. Higher energy would be better | Pre-dose baseline, 60 minutes post-dose, half-time, and end of match (3.5 hours) |
| Gut comfort | Visual Analog Scale (VAS), vertical marking on 100 mm horizontal line. No or less nausea, fullness or bloating would be better | Pre-dose baseline, 60 minutes post-dose, half-time, and end of match (3.5 hours) |
| Heart rate | By electronic reading. Lower would be better. | Continuous from pre-dose baseline through end of match (3.5 hours) |
| Hydration status | Urine osmolality in mOsm/kg change in concentration pre- vs. post-exercise | Pre-dose baseline and end of match (3.5 hours) |