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| Name | Class |
|---|---|
| Wild Blueberry Association of North America | OTHER |
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This study aims to investigate whether consuming a drink containing powdered blueberries (equivalent to 150 g of fresh fruit) can improve mood and executive function in healthy emerging adults.
The present study will examine the psychological effects of a single dose of freeze-dried wild blueberries using a randomized, single-blind, placebo-controlled design. A total of 80 participants will be randomly allocated to consume either a drink prepared with 22 g blueberry powder or a drink prepared with 22 g placebo powder matched for macronutrients, flavour and colour.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Blueberry drink | Experimental |
| |
| Placebo drink | Placebo Comparator |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Blueberry drink | Dietary Supplement | 22 g freeze-dried wild blueberry (Vaccinium angustifolium) powder mixed with 250 ml water. |
|
| Measure | Description | Time Frame |
|---|---|---|
| Positive affect as measured by PANAS-X | Positive affect will be calculated by adding the values of the 21 positive items of the Positive and Negative Affect Schedule-X and the additional item "motivated". Thus, the scale will range from 0 to 88 points with higher scores indicating better mood. | 1.5 hours post-ingestion |
| Measure | Description | Time Frame |
|---|---|---|
| Negative affect as measured by PANAS-X | Negative affect will be calculated by adding the values of the 25 negative items of the Positive and Negative Affect Schedule-X. Thus, the scale will range from 0 to 100 points with higher scores indicating worse mood. | 1.5 hours post-ingestion |
| Executive function (accuracy) |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Claire Williams, Professor | Contact | +441183787540 | claire.williams@reading.ac.uk |
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| School of Psychology and Clinical Languages, University of Reading | Recruiting | Reading | Berkshire | RG6 6AL | United Kingdom |
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| Type | Includes Protocol | Includes SAP | Includes ICF | Document Label | Document Date | Document Uploaded Date | Document File Name |
|---|---|---|---|---|---|---|---|
| Prot_SAP | Yes | Yes | No | Study Protocol and Statistical Analysis Plan | Jan 10, 2023 | Jan 28, 2023 | Prot_SAP_000.pdf |
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Standard two-arm trial with a placebo arm and active intervention arm
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| Placebo drink | Dietary Supplement | 22 g placebo powder matched for macronutrients, color, and flavor mixed with 250 ml water. |
|
A task-switching test will be used to assess cognitive flexibility when switching between two predictable tasks requiring simple numerical decisions. The main outcome of interest is the average accuracy (0 to 100%). |
| 1.5 hours post-ingestion |
| Reaction time | The average reaction time on correct trials of the task-switching test (in milliseconds). | 1.5 hours post-ingestion |