Cook Matthew D, Dunne Aaron, Bosworth Michael, Willems Mark E T
School of Sport and Exercise Science, University of Worcester, Worcester WR2 6AJ, UK.
Institute of Sport, Nursing and Allied Health, University of Chichester, Chichester PO19 6PE, UK.
J Funct Morphol Kinesiol. 2022 May 30;7(2):44. doi: 10.3390/jfmk7020044.
Intake of anthocyanin-rich New Zealand blackcurrant (NZBC) can alter physiological responses that enhance exercise performance. In two studies, we examined the effects of NZBC extract on force steadiness during a sustained submaximal isometric contraction of the quadriceps femoris muscle. With repeated measures designs, male participants in study one ( = 13) and study two ( = 19) performed a 120 s submaximal (30%) isometric contraction of the quadriceps femoris muscle following a 7-day intake of NZBC extract and placebo (study one) and following 0 (control), 1-, 4- and 7-day intake of NZBC extract (study two). Participants for both studies were different. In study one, NZBC extract enhanced isometric force steadiness during the 120 s contraction (placebo: 6.58 ± 2.24%, NZBC extract: 6.05 ± 2.24%, = 0.003), with differences in the third (60-89 s) and fourth quartile (90-120 s) of the contraction. In study two, isometric force steadiness was not changed following 1 and 4 days but was enhanced following 7-day intake of NZBC extract in comparison to control. In study two, the enhanced isometric force steadiness following 7-day intake did occur in the second (30-59 s), third (60-89 s) and fourth (90-120 s) quartiles. Daily supplementation of anthocyanin-rich NZBC extract can enhance force steadiness of the quadriceps femoris muscle during a sustained submaximal isometric contraction. Our observations may have implications for human tasks that require postural stability.
摄入富含花青素的新西兰黑醋栗（NZBC）可改变生理反应，从而提高运动表现。在两项研究中，我们研究了NZBC提取物对股四头肌持续次最大等长收缩期间力量稳定性的影响。采用重复测量设计，研究一中的男性参与者（n = 13）和研究二中的男性参与者（n = 19）在摄入7天的NZBC提取物和安慰剂后（研究一），以及在摄入0（对照）、1、4和7天的NZBC提取物后（研究二），进行了120秒的股四头肌次最大（30%）等长收缩。两项研究的参与者不同。在研究一中，NZBC提取物在120秒收缩期间增强了等长力量稳定性（安慰剂：6.58±2.24%，NZBC提取物：6.05±2.24%，P = 0.003），在收缩的第三个四分位数（60 - 89秒）和第四个四分位数（90 - 120秒）存在差异。在研究二中，摄入1天和4天后等长力量稳定性没有变化，但与对照组相比，摄入7天的NZBC提取物后等长力量稳定性增强。在研究二中，摄入7天后增强的等长力量稳定性出现在第二个四分位数（30 - 59秒）、第三个四分位数（60 - 89秒）和第四个四分位数（90 - 120秒）。每日补充富含花青素的NZBC提取物可增强股四头肌在持续次最大等长收缩期间的力量稳定性。我们的观察结果可能对需要姿势稳定性的人类任务有影响。
