40KM time trials in competitive road cyclist
James, John David
Cardiff Metropolitan University
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/This study examined the effect of Coca-cola ingestion during a 40Km cycle time trial (TT). Six trained male cyclists, VO2max = 4.69 ! 0.44 (mean t SD) using their own bicycles mounted on a windload simulator, Kingcycle Ergometer, to imitate real riding conditions. At a selfselected pace, the cyclists performed two 40Km TT and were administered experimental drinks (separated by seven days). The two experimental drinks were 8% glucose solution and 'flat' coca-cola. For each TT 10 ml'kg-1 of the respective drink was administered. The 10 ml'kg-1 was divided in to four separate measures. The first measure was given before testing and the remaining three measures were provided at 10Km, 20Km and 30Km. The Coca-cola was administered in the second TT during the last half (20Km and 30Km). The results showed no significant differences between the two TT times (T = 0.73, p>0.05) and no significant differences were reported for the mean power output (T = 0.98, p>0.05). A relationship between heart rate and power was indicated but to no cause and effect. lt can be concluded that this study shows the level of caffeine present in Coca-cola alone is not beneficial in producing an increase in endurance performance. Future studies should examine Coca-cola to find out the mechanisms, if any, for endurance potential and for any ergogenic effect it may possess.
BSc (Hons) Sport, PE and Recreation