Exclusion Criteria

Participants will be excluded if they are unable or unwilling to provide informed written consent or comply with the study procedures. Participants will also be excluded if they have (i) known hypersensitivity or intolerance to blackcurrants or berryfruit and/or berryfruit-derived products, (ii) have health conditions that impair ability to perform Wingate cycle exercise (e.g. injury, hernia, back or joint pain, cardiovascular and breathing problems or fail to demonstrate a certain fitness level, assessed by a Baecke questionnaire, or are unable to perform the Wingate cycle exercise to the standard required by the trial co-ordinator, and (iii) health conditions that may affect ability to do computerized cognitive tasks (e.g. eye sight problems, colour blindness, aura migraines, epilepsy). In addition, participants will be excluded if they are pregnant or planning to get pregnant in the near future or have any of the following conditions; (i) blood borne diseases (e.g. hepatitis), (ii) clinically diagnosed high/low blood pressure, (iii) recent bacterial or viral illness, (iv) are taking any medication that affects the properties of blood (e.g. blood clotting).