New Zealand Blackcurrant Extract Enhances Muscle Oxygenation During Forearm Exercise in Intermediate-Level Rock Climbers
New Zealand Blackcurrant Extract Enhances Muscle Oxygenation During Forearm Exercise in Intermediate-Level Rock Climbers
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DOI：
10.1123/ijsnem.2019-0365
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发表时间：
2020-07-01
影响因子：
2.5
通讯作者：
Potter, Julia A.
中科院分区：
文献类型：
--
作者：
Fryer, Simon;Paterson, Craig;Potter, Julia A.
前臂肌肉的含氧血红蛋白的输送和利用是攀岩性能的关键决定因素。富含花青素的新西兰黑加仑（NZBC）被认为可以改善血液流动，并可能增强前臂的耐力表现。因此，一项双盲、随机交叉设计研究有 12 名参与者在每天摄入 600 毫克 NZBC 提取物或安慰剂 7 天后进行次最大间歇性收缩（最大自主收缩的 40%）直至失败。在收缩期间评估最小组织饱和指数（TSI%）。在恢复期间，评估 TSI% 恢复一半的时间和肱动脉血流量。 NZBC 和安慰剂之间的力竭时间没有差异。 NZBC 提取物的最低 TSI% 较低（43 +/- 8 与 50 +/- 11 TSI%；p = .007；Cohen's d = 1.01）。在恢复期间，它们对肱动脉血流没有影响。然而，在力竭收缩后，NZBC 的半恢复时间更快（26 +/- 17 与 42 +/- 26 秒；p = .001；Cohen's d = 1.3）。 7 天的 NZBC 提取物似乎可以改善收缩期间和收缩后的肌肉氧合，而动脉血流量或前臂耐力表现没有变化。
The delivery to and utilization of oxygenated hemoglobin to the forearm muscles are key determinants of rock-climbing performance. Anthocyanin-rich New Zealand blackcurrant (NZBC) has been suggested to improve blood flow and may enhance forearm endurance performance. As such, a double-blind, randomized crossover design study with 12 participants performed submaximal intermittent contractions (at 40% maximal voluntary contraction) to failure after a 7-day intake of 600 mg/day NZBC extract or placebo. Minimum tissue saturation index (TSI%) was assessed during the contractions. During recovery, time to half recovery of TSI% and brachial artery blood flow were assessed. There was no difference in time to exhaustion between NZBC and placebo. Minimum TSI% was lower with NZBC extract (43 +/- 8 vs. 50 +/- 11 TSI%; p = .007; Cohen's d = 1.01). During recovery, them was no effect on brachial artery blood flow. However, time to half recovery was faster with NZBC (26 +/- 17 vs. 42 +/- 26 s; p = .001; Cohen's d = 1.3) following exhaustive contractions. Seven days of NZBC extract appears to improve muscle oxygenation during and following contractions with no change in either arterial blood flow or forearm endurance performance.