Effect of New Zealand Sujon blackcurrant on cardiovascular responses during cycling in triathletes

Willems et al. Journal of the International Society of Sports Nutrition 2014, 11(Suppl 1):P11 http://www.jissn.com/content/11/S1/P11 POSTER PRESENTATION Open Access Effect of New Zealand Sujon blackcurrant on cardiovascular responses during cycling in triathletes Mark ET Willems*, Stephen D Myers, Matthew D Cook, Mandy L Gault From The Eleventh International Society of Sports Nutrition (ISSN) Conference and Expo Clearwater Beach, FL, USA. 20-21 June 2014 Background Anthocyanin is a component known to induce vasorelaxation and vasodilation in rat aortic rings [1] and is present in high amounts in New Zealand Sujon blackcurrant. During typing work in humans, an activity of low intensity, peripheral blood flow was increased by blackcurrant intake [2]. It is not known whether anthocyanin would affect the cardiovascular responses at different exercise intensities. We examined the effect of 1week Sujon blackcurrant powder supplementation on cardiovascular responses at low, moderate and high intensities of trained triathletes. Methods Ten healthy triathletes with >3 years experience (5 men and 5 women; mean±SD: age: 40±5 years, height: 173±6 cm, body mass: 69±9 kg, BMI: 23±2, BF%: 19±4%, VO2max: 49±7 mL kg-1 min-1, maximum power: 293±68 W) volunteered. Participants were tested following 7 days of Sujon blackcurrant powder (S, 6g/day) or placebo (P) intake, administered following a double-blind, crossover, randomized design with a wash-out period of 4 weeks. Cardiovascular function (Portapres® Model 2, Finapres Medical Systems BV, Amsterdam, The Netherlands) was recorded during an incremental cycling protocol (4 min stages with 2 min recovery, start power 50 W with 30 W increments). Stages representing low (i.e. 40% VO2max), moderate (i.e. 60%) and high (i.e. 80%) intensity were analysed for responses averaged for the last minute. Paired two-tailed t-tests were used for analysis with significance accepted at p<.05. Consent to publish the results was obtained from all participants. * Correspondence: Department of Sport and Exercise Sciences, University of Chichester, United Kingdom Results At each intensity, there were no differences in systolic BP (40% - P: 183±29, S: 195±31, p=.13; 60% - P: 196 ±35, S: 195±31, p=.40; 80% - P: 215±33, S: 220±33 mmHg, p=.50), diastolic BP (40% - P: 82±14, S: 88±17, p=.09; 60% - P: 87±14, S: 88±17, p=.39; 80% - P: 97±14, S: 101±19 mmHg, p=.36), heart rate (40% - P: 100±9, S: 101±10, p=.62; 60% - P: 126±12, S: 125±11, p=.85; 80% - P: 152±13, S: 154±11 beats min -1 , p=.56), stroke volume (40% - P: 100±17, S: 96±24, p=.47; 60% - P: 94 ±20, S: 88±26, p=.53; 80% - P: 88±18, S: 88±28 mL, p=.98), cardiac output (40% - P: 10.0±1.8, S: 9.8±2.4, p=.78; 60% - P: 11.8±2.8, S: 11.6±3.1, p=.90; 80% - P: 13.3±2.6, S: 13.4±4.1 L min-1, p=.93), and total peripheral resistance (40% - P: 11.6±4.3, S: 13.2±5.6, p=.28; 60% - P: 10.7±4.3, S: 11.7±6.3, p=.60; 80% - P: 10.2±3.3, S: 11.3±5.5 mmHg L-1 min-1, p=.34). Conclusion Previous studies indicated that anthocyanin intake may have performance-enhancing effects resulting from highintensity training [3] and increases peripheral blood flow at very low intensity [2]. The cardiovascular responses at low, moderate and high intensity cycling in trained triathletes athletes were unaffected by one week intake of New Zealand Sujon blackcurrant powder. It is concluded that New Zealand Sujon blackcurrant does not have adverse cardiovascular effects during exercise in trained triathletes. Acknowledgement Funding for this study and conference attendance was provided by the University of Chichester, Health Currancy Ltd (UK) and Gibb Holdings (Nelson) Ltd (NZ). © 2014 Willems et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http:// creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Willems et al. Journal of the International Society of Sports Nutrition 2014, 11(Suppl 1):P11 http://www.jissn.com/content/11/S1/P11 Page 2 of 2 Published: 1 December 2014 References 1. Ziberna L, Kim JH, Auger C, Passamonti S, Schini-Kerth V: Role of endothelial cell membrane transport in red wine polyphenols-induced coronary vasorelaxation: involvement of bilitranslocase. Food Funct 2013, 4(10):1452-6. 2. Matsumoto H, Kamm KE, Stull JT, Azuma H: Delphinidin-3-rutinoside relaxes the bovine ciliary smooth muscle through activation of ETB receptor and NO/cGMP pathway. Exp Eye Res 2005, 80(3):313-22. 3. Braakhuis AJ, Hopkins WG, Lowe TE: Effects of dietary antioxidants on training and performance in female runners. Eur J Sport Sci 2014, 14(2):160-8. doi:10.1186/1550-2783-11-S1-P11 Cite this article as: Willems et al.: Effect of New Zealand Sujon blackcurrant on cardiovascular responses during cycling in triathletes. Journal of the International Society of Sports Nutrition 2014 11(Suppl 1):P11. Submit your next manuscript to BioMed Central and take full advantage of: • Convenient online submission • Thorough peer review • No space constraints or color figure charges • Immediate publication on acceptance • Inclusion in PubMed, CAS, Scopus and Google Scholar • Research which is freely available for redistribution Submit your manuscript at www.biomedcentral.com/submit  (...truncated)