Research output: Contribution to journal › Article
|Number of pages||17|
|Journal||International Journal of Sports Physiology and Performance|
|Journal publication date||24 Aug 2016|
|State||Published - 24 Aug 2016|
PURPOSE: The aim of the study was: a) to determine the effect of supramaximal exercise intensity, during constant work-rate cycling to exhaustion, on the accumulated oxygen deficit (AOD); and b) to determine the test-retest reliability of AOD.
METHODS: Twenty one trained male cyclists and triathletes (means ± standard deviation for age and maximal oxygen uptake (V̇O2max) were 41 ± 7 years and 4.53 ± 0.54 L·min(-1), respectively) performed initial tests to determine the linear relationship between oxygen uptake (V̇O2max) and power output, and V̇O2max. In subsequent trials, AOD was determined from exhaustive square-wave cycling trials at 105, 112.5 (in duplicate), 120 and 127.5% V̇O2max.
RESULTS: Exercise intensity had an effect (P = 0.011) on the AOD (3.84 ± 1.11, 4.23 ± 0.96, 4.09 ± 0.87 and 3.93 ± 0.89 L at 105, 112.5, 120 and 127.5% V̇O2max, respectively). Specifically, AOD at 112.5% V̇O2max was greater than at 105% V̇O2max (P = 0.033) and at 127.5% V̇O2max (P = 0.022), but there were no differences between the AOD at 112.5% and 120% V̇O2max. In 78% of the participants, the maximal AOD occurred at 112.5 or 120% V̇O2max. The reliability statistics of the AOD at 112.5% V̇O2max, determined as intraclass correlation coefficient and coefficient of variation, were 0.927 and 8.72% respectively. Conclusions The AOD, determined from square-wave cycling bouts to exhaustion, peaks at intensities of 112.5-120% V̇O2max. Moreover, the AOD at 112.5% V̇O2max exhibits an 8.7% test-retest reliability.