Influence of blood donation on the incidence of plateau at VO2max

Gordon, Dan, Wood, Madeleine, Porter, Andrew, Vetrivel, Vignesh, Gernigon, Marie, Caddy, Oliver, Merzbach, Viviane, Keiller, Don, Baker, James and Barnes, Richard (2014) Influence of blood donation on the incidence of plateau at VO2max. European Journal of Applied Physiology, 114 (1). pp. 21-27. ISSN 1439-6327

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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 V˙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, V˙O 2 was determined on a breath-by-breath basis using a pre-calibrated metabolic cart. The criteria for plateau determination was a ∆ V˙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 V˙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 V˙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 V˙O 2max.

Item Type: Journal Article
Keywords: plateau, VO2max, blood reduction, anaerobic metabolism
Faculty: ARCHIVED Faculty of Science & Technology (until September 2018)
Depositing User: Ian Walker
Date Deposited: 09 Mar 2018 12:09
Last Modified: 18 Feb 2022 14:32

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