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Title: Exercise induced plasma volume expansion lowers cardiovascular strain during 15-km cycling time-trial in acute normobaric hypoxia. Open Access Deposited

http://creativecommons.org/publicdomain/zero/1.0/
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Abstract
  • The purpose of our study was to assess the influence of a single high-intensity interval exercise (HIIE) bout in normoxia on plasma volume (PV) and consequent cycling performance in normobaric hypoxia (0.15 FiO2, simulating ~2,500 m). Eight males (VO2peak: 48.8 ± 3.4 mL/kg/min, 24.0 ± 1.6 years) completed a hypoxic 15 km cycling time trial (TT), followed by a crossover intervention of either HIIE (8x4 min cycling bouts at 85% of VO2peak) or CON (matched kJ production from HIIE at 50% of VO2peak). 48 hours post intervention, an identical TT was performed. Cardiovascular parameters were measured via impedance cardiography during each TT. Changes in PV was measured 24 and 48 hours post HIIE and CON. HIIE increased PV at 24 (4.1 ± 3.9 %, P = 0.031) and 48 (6.7 ± 1.7, P = 0.006) hours post, while no difference was observed following the CON (1.3 ± 1.1 % and 0.3 ± 2.8 %). The higher PV led to an increased stroke volume (P = 0.03) and cardiac output (P = 0.02) during the hypoxic TT, while heart rate was not changed (P = 0.49). We observed no changes in time to completion (−0.63 ± 0.57 min, P = 0.054) and power output (7.37 ± 7.98 W, P = 0.078) between TTs. In the absence of environmental stress, a single bout of HIIE was an effective strategy to increase PV and reduce the cardiovascular strain during a cycling TT at moderate simulated altitude but did not impact hypoxic exercise performance.
Methodology
  • Data for this research study were collected and assembled in the attached Excel file. These data were subsequently analyzed for the manuscript using GraphPad Prism version 9.0.0 (Prism, San Diego, CA) statistical software.
Description
  • Data for this research study were collected and assembled in the attached Excel file. These data were subsequently analyzed for the manuscript using GraphPad Prism version 9.0.0 (Prism, San Diego, CA) statistical software.
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  • 01/11/2024
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To Cite this Work:
Gorini Pereira, F. Exercise induced plasma volume expansion lowers cardiovascular strain during 15-km cycling time-trial in acute normobaric hypoxia [Data set]. Indiana University - DataCORE.

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PVE_Data_Set.xlsx 2024-01-11 2024-01-11 40.8 KB Open Access

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