Abstract
The study examined the influence of cerebral (prefrontal cortex) and muscle (vastus lateralis) oxygenation on the ability to perform repeated, cycling sprints. Thirteen team-sport athletes performed ten, 10-s sprints (with 30 s of rest) under normoxic (FIO2 0.21) and acute hypoxic (FIO2 0.13) conditions in a randomised, single-blind fashion and crossover design. Mechanical work was calculated and arterial O2 saturation (SpO2) was estimated via pulse oximetry for every sprint. Cerebral and muscle oxy-(O2Hb), deoxy-(HHb), and total haemoglobin (THb) were monitored continuously by near-infrared spectroscopy. Compared with normoxia, hypoxia induced larger decrements in SpO2 and work (11.6 and 7.6%, respectively; P < 0.05). In the muscle, we observed a fairly constant level of deoxygenation across sprints, with no effect of the condition. In normoxia, regional cerebral oxygenation increased during the first two sprints and slightly fluctuated thereafter. In contrast, this initial cerebral hyper-oxygenation was attenuated in hypoxia. Changes in [O2Hb] and [HHb] occurred earlier and were larger in hypoxia compared with normoxia (P < 0.05), while regional blood volume (Δ[THb]) remained unaffected by the condition. Changes in cerebral [HHb] and mechanical work were strongly correlated in normoxia and hypoxia (R 2 = 0.81 and R 2 = 0.85, respectively; P < 0.05), although the slope of this relationship differed (normoxia, −351.3 ± 183.3 vs. hypoxia, −442.4 ± 227.2; P < 0.05). The results of this NIRS study show that O2 availability influences prefrontal cortex, but not muscle, oxygenation during repeated, short sprints. By using a hypoxia paradigm, the study suggests that cerebral oxygenation contributes to the impairment of repeated-sprint ability.
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Acknowledgments
The authors thank the athletes and coaches from the University of Lethbridge Pronghorn Men’s soccer and rugby teams for participation in the study. The authors have no conflicts of interest that are directly relevant to the content of this manuscript. This research was supported by grants from the Canada Foundation for Innovation, the University of Lethbridge, and the Alberta, Sport, Recreation Park and Wildlife Foundation (to F. Billaut).
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Communicated by Susan Ward.
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Smith, K.J., Billaut, F. Influence of cerebral and muscle oxygenation on repeated-sprint ability. Eur J Appl Physiol 109, 989–999 (2010). https://doi.org/10.1007/s00421-010-1444-4
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DOI: https://doi.org/10.1007/s00421-010-1444-4