AUTHOR=Kojima Chihiro , Yamaguchi Keiichi , Ito Hiroto , Kasai Nobukazu , Girard Olivier , Goto Kazushige 

TITLE=Acute Effect of Repeated Sprint Exercise With Blood Flow Restriction During Rest Periods on Muscle Oxygenation

JOURNAL=Frontiers in Physiology

VOLUME=12

YEAR=2021

URL=https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2021.665383

DOI=10.3389/fphys.2021.665383

ISSN=1664-042X

ABSTRACT=<sec><title>Purpose</title><p>This study aimed to examine the effect of applying BFR during rest periods of repeated cycling sprints on muscle oxygenation.</p></sec><sec><title>Methods</title><p>Seven active males performed 5 × 10-s maximal pedaling efforts with 40-s passive rest, with or without BFR application during rest period. BFR was applied for 30 s between sprints (between 5 and 35 s into rest) through a pneumatic pressure cuff inflated at 140 mmHg. <italic>Vastus lateralis</italic> muscle oxygenation was monitored using near-infrared spectroscopy. In addition, blood lactate concentration and heart rate were also evaluated.</p></sec><sec><title>Results</title><p>The BFR trial showed significantly lower oxyhemoglobin (oxy-Hb) and tissue saturation (StO<sub>2</sub>) levels than the CON trial (<italic>P</italic> &lt; 0.05). However, power output and blood lactate concentration did not significantly differ between the two trials (<italic>P</italic> &gt; 0.05).</p></sec><sec><title>Conclusion</title><p>Applying BFR during rest periods of repeated cycling sprints decreased muscle oxygenation of active musculature, without interfering with power output during sprints.</p></sec>