Abstract
Purpose
The purpose of this study was to examine the effects of reductions in blood volume and associated oxygen-carrying capacity on the incidence of plateau at \(\dot{V}{\text{O}}\) 2max.
Methods
Fifteen well-trained athletes (age 23.3 ± 4.5; mass 77.4 ± 13.1 kg, height 180.1 ± 6.0 cm) completed three incremental cycle tests to volitional exhaustion, of which the first was defined as familiarisation, with the remaining two trials forming the experimental conditions of pre- (UBL) and post-(BLE) blood donation (~450 cm3). The work rate for the incremental tests commenced at 100 W for 60 s followed by a ramp of 0.42 W s−1, with cadence being held constant at 80 rpm. Throughout all trials, \(\dot{V}{\text{O}}\) 2 was determined on a breath-by-breath basis using a pre-calibrated metabolic cart. The criteria for plateau determination was a ∆\(\dot{V}{\text{O}}\) 2 ≤ 50 ml min−1 over the final two consecutive 30 s sampling periods.
Results
Despite a significant (P = 0.0028) 9.4 % reduction in haemoglobin concentration and 10.8 % (P = 0.016) reduction in erythrocyte count between UBL and BLE, there was no change in plateau incidence. However, significant differences were observed for both \(\dot{V}{\text{O}}\) 2max (P = 0.0059) 51.3 ± 7.6 (UBL) 48.4 ± 7.9 ml kg−1 min−1 (BLE) and gas exchange threshold arrival time 383.4 ± 85.2 s (UBL) 349.2 ± 71.4 s (BLE) (P = 0.0028).
Conclusion
These data suggest that plateau at \(\dot{V}{\text{O}}\) 2max is unaffected by O2 availability lending support to the notion of the plateau being dependent on the anaerobic capacity and the classically orientated concept of \(\dot{V}{\text{O}}\) 2max.
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Communicated by Carsten Lundby.
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Gordon, D., Wood, M., Porter, A. et al. Influence of blood donation on the incidence of plateau at \( \dot{V}{\text{O}} \) 2max . Eur J Appl Physiol 114, 21–27 (2014). https://doi.org/10.1007/s00421-013-2743-3
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DOI: https://doi.org/10.1007/s00421-013-2743-3