Abstract
Recent technological developments provide easy access to use an artificial oxygen supply (hyperoxia) during exercise training. The aim of this study was to assess the efficacy of a commercially available oxygen compressor inducing low-dose hyperoxia, on limiting factors of endurance performance. Thirteen active men (age 24 ± 3 years) performed a high-intensity interval exercise (HIIE) session (5 × 3 min at 80% of Wmax, separated by 2 min at 40% Wmax) on a cycle ergometer, both in hyperoxia (4 L∙min−1, 94% O2, HYP) or ambient conditions (21% O2, NORM) in randomized order. The primary outcome was defined as red blood cell deformability (RBC-D), while our secondary interest included changes in muscle oxygenation. RBC-D was expressed by the ratio of shear stress at half-maximal deformation (SS1/2) and maximal deformability (EImax) and muscle oxygenation of the rectus femoris muscle was assessed by near-infrared spectroscopy. No statistically significant changes occurred in SS1/2 and EImax in either condition. The ratio of SS1/2 to EImax statistically decreased in NORM (p < 0.01; Δ: −0.10; 95%CI: −0.22, 0.02) but not HYP (p > 0.05; Δ: −0.16; 95%CI: −0.23, −0.08). Muscle oxygenation remained unchanged. This study showed that low-dose hyperoxia during HIIE using a commercially available device with a flow rate of only 4 L·min−1 may not be sufficient to induce acute ergogenic effects compared to normoxic conditions.
Highlights
Oxygen uptake, transport, and use are crucial domains of endurance capacity [1,2]
This study aimed to investigate the effects of low-dose hyperoxia during a high-intensity interval interval exercise session on red blood cell deformability (RBC-D), tissue oxygenation and blood lactate concentrations (BLa) using a commercially available exercise session on red blood cell (RBC)-D, tissue oxygenation and BLa using a commercially available oxygen oxygen compressor
Despite the small but statistically significant increase in RBC-D in normoxic conditions, conditions, we showed that RBC-D remained physiologically unaltered when high-intensity interval exercise (HIIE) was performed we showed that RBC-D
Summary
Transport, and use are crucial domains of endurance capacity [1,2]. Several determinants, such as pulmonary diffusion and cardiac output and peripheral factors such as the oxygen carrying capacity of the blood and mitochondrial density of skeletal muscle are affecting the oxygen flux [1]. Cardiac output and mitochondrial density may adapt during chronic training, mainly the oxygen carrying capacity can be influenced acutely [1] and, might be of interest for short-term improvements in endurance capacity. Hyperoxia was previously shown to improve acute endurance performance during cycling [7,8], rowing [9,10], swimming [11] and running [12], as represented by increased rates of maximal power output and peak oxygen consumption (VO2peak )
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