THE EFFECT OF INTERVAL DURATION DURING INTERMITTENT EXERCISE ON SUBSEQUENT SPRINT PERFORMANCE
University of Wales Institute Cardiff
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Different interval durations during acute intermittent exercise can affect the metabolic status within the working muscles. This study compared the effects of the interval duration during intermittent exercise on a subsequent sprint performance and was ethically approved prior to commencing. Nine male subjects (age 20.9 ± 1.1 years, height 179.8 ± 7.4 cm, and body mass 84.2 ± 9.5 kg) completed three 20 minute intermittent exercise protocols on an electronically braked cycle ergometer. Each protocol utilised a work:rest ratio of 1:1 and were completed on separate days. The work periods were performed at an intensity of 75% power achieved at VO2 max with passive rest periods. The interval durations were set at a work:rest of 15:15s, 30:30s and 60:60s which were completed in random order. This work:rest ratio produced the same total amount of work between protocols and isolated the interval durations as the only independent variable. A 15s Wingate anaerobic test (WAnT) was performed subsequent to each intermittent exercise protocol and a WAnT from rest was also completed as a baseline measure. Heart rate and oxygen consumption were recorded throughout each exercise protocol. The WAnTs performed subsequent to the intermittent protocols (15s, 30s and 60s) produced a significantly lower peak power output than the baseline WAnT (P = 0.049, 0.014 and 0.006, respectively). The 60s produced a significantly lower mean power output than the baseline WAnT (P = 0.04). The 60s peak heart rate during the 20 minute exercise protocol was significantly higher than 15s and 30s (P = 0.01 and 0.000, respectively). In conclusion, intermittent exercise causes a significant decrement in sprint peak power output when compared with a baseline measure. The cause of this could be due to a depletion of phosphocreatine within the muscles caused by intermittent exercise.
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