The New Zealand Institute for Plant & Food Research Ltd. New Zealand Ltd, Private Bag, Palmerston North, 11030, New Zealand.
The New Zealand Institute for Plant & Food Research Ltd. MARC, Auckland, New Zealand Ltd, Private Bag 92169, Auckland, 1142, New Zealand.
J Int Soc Sports Nutr. 2019 Aug 2;16(1):33. doi: 10.1186/s12970-019-0300-0.
Affective responses experienced during exercise are a significant determinant on exercise adherence. We have previously demonstrated that consumption of New Zealand (NZ) blackcurrants preserves cognition by attenuating the feeling of fatigue. This positive affective response correlated with the ability of blackcurrant polyphenols to support monoamine neurotransmission via inhibition of monoamine oxidase-B (MAO-B) activity. Here we explore how the consumption of a NZ blackcurrant juice (BJ) influenced affective responses and potential ergogenic action on the motivation to adhere to a low impact walking exercise.
In a parallel randomized controlled study (Trial registration #: ACTRN12617000319370p, registered 28th February 2017, http://www.anzctr.org.au/ ), 40 healthy sedentary male and female participants drank a BJ or matched placebo (PLA) (n = 20 per group), 1 h prior to a self-motivated treadmill walk, where heart rate and affective responses (exertion [ES] or feeling / mood [FS]) scores) were recorded at 3 or 5 min intervals. Blood glucose, lactate, malondialdehyde (MDA) and platelet MAO-B activity were measured pre- and post-exercise and comparisons were conducted using with Student's t-tests. Subjective data were analysed using 2-way ANOVA with appropriate post hoc tests.
Consuming a BJ 1 h prior to exercise caused a 90% decline in platelet MAO-B activity. The exercise had no significant (p > 0.05) effect on blood lactate, glucose or plasma MDA levels. Assessment of affective responses over the first 60 mins (adjusting for participant drop-out) revealed a time-dependent ES increase in both groups, with ES reported by participants in the BJ group consistently lower than those in the PLA group (p < 0.05). FS declined in PLA and BJ groups over 60 mins, but an inverse relationship with ES was only observed within the PLA group (r = 0.99, p = 0.001). Whilst the average time walked by participants in the BJ group was 11 mins longer than the PLA group (p = 0.3), and 30% of the BJ group achieving > 10 km compared to only 10% for the PLA group (p = 0.28), statistical significance was not achieved.
Our findings demonstrate that drinking a polyphenolic-rich NZ blackcurrant juice 1 h prior to exercise supports positive affective responses during a self-motivated exercise.
运动过程中体验到的情感反应是影响运动坚持度的重要决定因素。我们之前的研究表明，新西兰黑加仑的消费可以通过抑制单胺氧化酶-B（MAO-B）的活性来保护认知，减轻疲劳感。这种积极的情感反应与黑加仑多酚通过抑制 MAO-B 活性支持单胺神经递质传递的能力相关。在这里，我们探讨了新西兰黑加仑汁（BJ）的消费如何影响情感反应，并对坚持低冲击步行运动的动机产生潜在的促进作用。
在一项平行随机对照研究（试验注册号：ACTRN12617000319370p，于 2017 年 2 月 28 日注册，[网址]）中，40 名健康的久坐男性和女性参与者在自愿进行跑步机步行前 1 小时饮用 BJ 或匹配的安慰剂（PLA）（每组 20 人），每隔 3 或 5 分钟记录心率和情感反应（用力[ES]或感觉/情绪[FS]评分）。在运动前后测量血糖、乳酸、丙二醛（MDA）和血小板 MAO-B 活性，并使用学生 t 检验进行比较。使用 2 因素方差分析和适当的事后检验分析主观数据。
运动前 1 小时饮用 BJ 可使血小板 MAO-B 活性降低 90%。运动对血液乳酸、葡萄糖或血浆 MDA 水平没有显著影响（p>0.05）。在最初 60 分钟内评估情感反应（调整参与者脱落）时，两组的 ES 均呈时间依赖性增加，BJ 组的 ES 报告始终低于 PLA 组（p<0.05）。FS 在 PLA 和 BJ 组在 60 分钟内下降，但仅在 PLA 组观察到 ES 与 FS 之间的反向关系（r=0.99，p=0.001）。尽管 BJ 组的平均步行时间比 PLA 组长 11 分钟（p=0.3），且 30%的 BJ 组行走距离超过 10 公里，而 PLA 组只有 10%（p=0.28），但未达到统计学意义。
我们的研究结果表明，运动前 1 小时饮用富含多酚的新西兰黑加仑汁可以在自愿运动过程中支持积极的情感反应。
