Synopsis: This study tested the effect of CurraNZ on femoral artery diameter and cardiovascular responses during 30% isometric maximal voluntary contraction of the quadriceps muscle and produced high-impact results. Muscle blood flow is critical for oxygen delivery and resulting muscle function, as well as improved performance due to reduced fatigue. Results showed:
- 20-35% increased blood flow was observed due to the vasodilatory actions (widening of blood vessels) of CurraNZ. The blackcurrant extract created a 6.9%- 8.2% increase in femoral artery diameter.
- Blood pressure was 7-12% lower during muscle contraction, indicating cardiovascular system experienced less stress.
- Muscle fibres demonstrated 11-16% less activity: indicates muscles worked to the same intensity with reduced stress.
- Cardiovascular responses include increases to cardiac output and stroke volume by 16% and 11%, and reductions of total peripheral resistance by 25%.
- Reduced fatigue was observed as a result of increased blood flow, higher total haemoglobin and enhanced uptake and utilization of oxygen in the muscle. As a result, the muscle didn't work as hard
- Subjects had higher total haemoglobin, enhanced uptake and utilization of oxygen in the muscle, which led to reduced fatigue. As a result, the muscle didn't work as hard
- Study tested 600mg NZBC on 15 recreational and nine Professional Academy Youth football players to investigate whether blackcurrant extract would improve performance during repeated, high-intensity sprints
- Blackcurrant had a clear effect on the trained players, who experienced less slowing in the sprint tests
- Trained footballers had reduced slowing of sprint times, an effect not observed in the non-elite players
- 12 of the 24 players (including five of the nine Academy players) demonstrated a lower fatigue index by a combined absolute value of 12%, calculated on the change in maximum power to the slowest sprint
- Trained footballers benefited more from New Zealand blackcurrant extract supplementation in exhaustive running test with long recovery times
- CurraNZ blackcurrant extract improved 16.1 km time trial performance by 2.4% (mean) with improvements up to 8.6%.
- CurraNZ improved fat oxidation up to 27% at moderate exercise intensity
- CurraNZ blackcurrant extract improved cycling speed in the last 75% of the 16.1 km time-trial.
- CurraNZ allowed athletes to tolerate higher concentrations of blood plasma lactate
- Fat oxidation at ~65% Vo2max in trained cyclists by intake of New Zealand blackcurrant extract for 7 days exhibited a dose-dependent response
- During 120 minutes of cycling at ~65% Vo2max, NZB extract increased fat oxidation by 17.5%, 22% and 24% for 300mg, 600mg and 900mg
- During 120 minutes cycling ~65% Vo2max, NZB extract decreased carbohydrate oxidation by up to 11.5%
- Scientists excited at the degree to which blackcurrant increased fat oxidation in trained individuals with already existing metabolic adaptations
- Participants burned an extra 116 calories as a result of blackcurrant extract's influence on fat metabolism in higher-dose groups
- Dose-response study investigating cardiovascular responses in cyclists at rest, with 300mg, 600mg, 900mg NZB extract
- Results showed NZB extract had a moderate to large effect on CV responses
- Responses varied between doses, highest at 900mg
- Extract reduced total peripheral resistance by 20.2% (900mg)
- Increased cardiac output 27.5% (900mg)
- Increased stroke volume 17.7% (900mg)
- Effect on blood volume pumped may enhance post-exercise recovery in athletes
- May be beneficial for clinical populations affected by reduced circulation
- Respiratory Exchange Ratio decreased 2.49% / 2.48% for 600mg and 900mg/day
- Change indicated enhanced fat oxidation
- Increased fat oxidation by New Zealand blackcurrant extract may enhance performance
- Assists the natural benefits of exercise
- Controls oxidative stress and inflammation
- Assits immune protection - enhanced immunity
- Speedier tissue repair, recovery and performance
- Train/work harder and for longer
- Blackcurrant consumption modulates exercise-induced oxidative stress and inflammatory responses
- NZBC extract, exhibiting both antioxidant and anti-inﬂammatory properties, if ingested at appropriate amounts and at the appropriate time, may enhance exercise-induced health beneﬁts
- Long-term consumption of NZBC anthocyanins may activate adaptive antioxidant and immune modulatory mechanisms.
- Delayed OBLA, complete shift of the lactate curve, which may have beneficial implications for endurance athletes as it would allow prolonged high intensity exercise during competition and endurance exercise training
- Lower lactate of 13% and increased power at maximum oxygen uptake
- Up to 27% lower lactate across all cycling intensities
- Conclusion: Observations suggest increased lactate clearance
- The delay in OBLA could be predictive for an enhancement of cycling endurance performance
- CurraNZ blackcurrant extract improved distance covered during sprints by 10.6%, or 411m (mean)
- 1 in 3 subjects improved more than 15%.
- A trend towards higher lactate at exhaustion
- Participants showed increased lactate clearance up to 30 minutes post exercise, showing improved recovery
Paper published in the International Journal of Sports Nutrition and Exercise Metabolism
- Study assessed whether NZBC could help athletes maintain the performance of repeated maximal sprints in field sports, especially in latter stages of game
- Eight of 13 participants had higher running times to exhaustion after consuming CurraNZ
- Those participants who increased time to exhaustion did so by on average 15%
- NZBC intake allowed for better maintenance of the fastest sprint time during LIST
- Participants tolerated higher heart rate values and ran for longer at higher intensity
- Particpants showed reduced slowing of the fastest sprints at exhaustive stages
- Blackcurrant anthocyanin increases resting blood flow
- Prevents decrease in muscle oxygenation that occurs during exercise
- Increases production nitric oxide
- Increases arterial flow to muscle tissue
- Reduces workload on muscles due to increase blood flow and oxygen supply
- Facilitates removal of unfavorable metabolites (lactic acid, free fatty acids, etc)
- Prevents hypoxia and disturbance of oxidative metabolism in muscles
- Protects cells from oxidative stress, which leads to intracellular imbalanced DNA lesions (thus inhibiting DNA damage)
- Polyphenols reduce oxidative stress by antioxidant enzymes
- Polyphenols act as inflammatory modulatory agents by inhibiting the inflammatory signalling cascades
- Increases the cells' ability to scavenge ROS* produced in inflammatory processes.
- Berry extract improved mean times by 0.82%
- Seven out of ten cyclists improved power outputs
- Subjects saw improved times through mid-sections of 4km time trials
- Study shows New Zealand blackcurrant has small performance effect in short-duration, high-intensity exercise model
Read the peer-reviewed, published paper here