The Acute Effects of Blueberries on Cognition and Mood in the Postpartum
试验速览
- 阶段
- 不适用
- 状态
- 尚未招募
- 入组人数
- 60
- 主要终点
- Mean current affect
研究概览
简要总结
Blueberries are an excellent source of natural substances (flavonoids) with well-documented health benefits. Previous research has shown that consuming a serving of blueberries can improve mood in children, healthy young adults, and young adults with depressive symptoms. These results are consistent with a growing body of evidence from human and animal studies indicating that blueberries can have a beneficial effect on brain function and mental health. The postpartum period represents a challenging period whereby mood disorders such as postpartum depression become increasingly prevalent, in addition to this, mothers and fathers often report poorer cognition during this time. Therefore, it is of interest to explore whether acute blueberry supplementation can benefit mood and cognition for parents during this sensitive time.
The aim of the present study is to examine whether consuming a drink containing powdered blueberries can improve mood and cognition in parents in the 0-6 month postpartum. The design follows a randomised, double blind, placebo controlled cross over design. Participants will be invited to take part in an in-person study investigating a fruit drink on mood and cognition. Participants will come to the Nutrition-cognition lab at the Psychology department at the University of Reading for a screening session, after providing informed consent, participants will return a week later to attend a 3-hr visit during which they will receive either a blueberry or placebo drink and complete computer tasks and standardised questionnaires. Participants will then return a week later and complete the same procedure, consuming the other intervention drink.
详细描述
The design follows a randomised, double blind, placebo controlled cross over design. Participants will be recruited via social media, posters in the local area, and through word of mouth and email advertisements and will be invited to take part in an in-person study investigating a fruit drink on mood and cognition. Participants will come to the Nutrition-cognition lab at the Psychology department for a screening session, during the session the study will be explained by the researcher and the participant will receive the participant information sheet. If the participant is eligible and wants to take part, they will sign the consent form. Data collected at screening will include age, ethnicity, highest level of education, marital status, specific diet, income, employment, physical illnesses, psychological diagnosis, regular medications, how old their infant is, infant gender, previous children, and age of other children as well as postnatal depression, postnatal anxiety (mother's sample only), state anxiety (father's sample only) a food frequency questionnaire and anthropometric measures to determine body mass index (BMI). Participants will then complete practice versions of the cognitive tests. Office for National Statistics recommendations will be used when collecting participants demographic details of ethnicity and income.
A week later, upon arrival at the Nutrition Cognition Lab (approximately 9am) participants will be asked to note what they had for breakfast (to ensure they have the same breakfast next week for standardisation) and a researcher will ask whether they have followed the pre-session restrictions prior to coming in for the visit (see below). Participants will then complete the mood and cognitive questionnaires (listed below) and have their blood pressure taken (duration 30 min). The order of questionnaires and cognitive tasks will be kept the same throughout the study. Participants will then be randomly allocated to consume one of two interventions (blueberry drink or a similarly flavoured placebo drink). The blueberry drink consists of 46g freeze dried wild blueberry powder mixed with 250ml water, the placebo drink contains 46g placebo powder matched for sugars and vitamin C content of the blueberry powder, mixed with 250ml water. The tests will then be repeated 2 hours after consuming the drink. Participants will be able to leave the lab and have free time for the 2hrs in between testing. During the procedure, we will also request that if participants bring their infant on the day, that they also bring a partner (friend, relative or parent of infant) to care for their infant during this time so to not distract the participant during the mood and cognitive tasks. Participants will then return to the lab a week later and carry out the same procedure, though consuming the other intervention drink. After the study has been completed, participants will be debriefed and given the opportunity to ask any questions. Participants will also be reminded of their right to withdraw their data from the study if they wish. Helplines and support web links will be provided to all participants as well as encouragement for participants to contact their GP should they wish to seek support. Helplines and weblinks include Samaritans UK and PANDAS Foundation. Weblinks to NHS, MIND and the Association for Postnatal Illness.
Pre-session restrictions: Twenty-four hours before the first and second test sessions, all participants will be advised to follow a low flavonoid diet which will be advised by an information sheet provided by the researchers upon sign-up. These restrictions will be implemented as a control measure so that other dietary flavonoids do not interfere with the results of the study and researchers will check adherence to restrictions prior to the first sitting of the study. Within this 24-hour period, participants will also be asked not to drink alcohol, caffeine or take recreational drugs. Participants will also be asked to refrain from exercise and food 2 hours before and following the intervention (water will be allowed) to avoid confounding effects.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 主要目的
- Basic Science
- 盲法
- Single (Investigator)
入排标准
- 年龄范围
- 18 Years 至 —（Adult, Older Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •Participants must be a biological mother or father to an infant aged 0-6 months.
- •Have a good understanding of English language
排除标准
- •Allergic to blueberries or any other Vaccinium species
- •Participation in other interventional studies within the last month
- •Participants with cancer, or conditions affecting the liver, heart or kidneys due to unknown effects on flavonoid metabolism
结局指标
主要结局
Mean current affect
时间窗: 2 hours post ingestion
Assessed using scores from the Positive and Negative Affect Scale. This questionnaire has 20 items that describe some feelings and emotions. The participant needs to mark how much they are experiencing these feelings on a scale from 1-5. This produces scores of Positive Affect and Negative Affect; higher scores reflect higher positive or negative mood, respectively.
次要结局
- Mean subjective mood scores(2 hours post ingestion)
- Blood pressure(2 hours post ingestion)
- Verbal memory(2 hours post ingestion)
- Sustained attention and executive functioning(2 hours post ingestion)
- Visuospatial working memory(2 hours post ingestion)
- Mean state anxiety(2 hours post ingestion)
- Mean subjective feelings(2 hours post ingestion)
研究者
Daniel Lamport
Dr Daniel Lamport
University of Reading