New Zealand blackcurrant extract enhances muscle oxygenation during forearm exercise in intermediate-level rock climbers
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, there 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.
© Copyright 2020 International Journal of Sport Nutrition and Exercise Metabolism. Human Kinetics. Kaikki oikeudet pidätetään.
Aiheet: | urheilu kiipeily ravitsemus lisäravinteiden käyttö ergogeeninen apu lihas suorituskyky kuormitus ajoittainen uupumus |
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Aihealueet: | tekniset lajit biologiset ja lääketieteelliset tieteet |
DOI: | 10.1123/ijsnem.2019-0365 |
Julkaisussa: | International Journal of Sport Nutrition and Exercise Metabolism |
Julkaistu: |
2020
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Vuosikerta: | 30 |
Numero: | 4 |
Sivuja: | 258-263 |
Julkaisutyypit: | artikkeli |
Kieli: | englanti (kieli) |
Taso: | kehittynyt |