The Acute Effect of Hyperoxia on Onset of Blood Lactate Accumulation (OBLA) and Performance in Female Runners during the Maximal Treadmill Test.

Thays C Silva,Danielle D Pereira,Dihogo Gama Matos,Devisson Dos Santos Silva,Felipe J Aidar,Alexandre Reis Pires Ferreira,Jymmys Lopes Dos Santos,Mabliny Thuany,Raphael F De Souza,Heleno Almeida Junior,Paulo Emmanuel Nunes Rezende,Felipe Douglas Silva Barbosa,Aristela De Freitas Zanona

doi:10.3390/ijerph18094546

Abstract

The objective of this study was to analyze the acute effect of hyperoxia during the maximal treadmill test (MTT) of runners. Participants included 10 female street runners who performed the MTT under two different conditions: hyperoxia (HYPX), inhaling oxygen (60% O2) every 3 min; and normoxia (NORM), without additional oxygen inhalation. Both groups performed the MTT with increases in the slope of the run every 3 min until voluntary exhaustion. The variables of lactate concentration, the onset of blood lactate accumulation (OBLA), peripheral oxygen saturation (SpO2), heart rate (HR), and Borg scale were evaluated. It was verified after the comparison (HYPX vs. NORM) that stage 3 (p = 0.012, Cohen’s d = 1.76) and stage 4 (p < 0.001; Cohen’s d = 5.69) showed a reduction in lactate under the HYPX condition. OBLA under the HYPX condition was identified at a later stage than NORM. There were no differences in Borg scale, SpO2, and HR between the different conditions. It was concluded that the HYPX condition contributed to a reduction in lactate concentration and delayed OBLA in runners.

Highlights

Aerobic exercise performance has been shown to be greatly mediated through modifications in the arterial content of oxygen
At the end of the maximal treadmill test (MTT), it was possible to observe that the HYPX condition presented positive effects for performance, reaching a running stage superior to NORM
heart rate (HR) did not show any significant difference between NORM vs. HYPX under any of the conditions (p > 0.05) (Table 1)

Summary

Introduction

Aerobic exercise performance has been shown to be greatly mediated through modifications in the arterial content of oxygen. The efficiency of the use of oxygen-enriched air (O2 ), improving performance through increasing oxygen delivery, remains controversial [1,2]. The use of hyperoxia has increased in popularity during race training in an attempt to improve performance [1,2] but, contradictorily, hyperoxia may decrease muscle blood flow during rest from exercise in the forearm [3] and leg [4].

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