Abstract
Ten highly-trained Jiu-Jitsu fighters performed 2 repeated-sprint sessions, each including
2 sets of 8 x ~6 s back-and-forth running sprints on a tatami. One session was carried
out with normal breathing (RSN) and the other with voluntary hypoventilation at low
lung volume (RSH-VHL). Prefrontal and vastus lateralis muscle oxyhemoglobin ([O2Hb]) and deoxyhemoglobin ([HHb]) were monitored by near-infrared spectroscopy. Arterial
oxygen saturation (SpO2), heart rate (HR), gas exchange and maximal blood lactate concentration ([La]max) were also assessed. SpO2 was significantly lower in RSH-VHL than in RSN whereas there was no difference in
HR. Muscle oxygenation was not different between conditions during the entire exercise.
On the other hand, in RSH-VHL, cerebral oxygenation was significantly lower than in
RSN (−6.1±5.4 vs−1.5±6.6 µm). Oxygen uptake was also higher during the recovery periods
whereas [La]max tended to be lower in RSH-VHL. The time of the sprints was not different between
conditions. This study shows that repeated shuttle-run sprints with VHL has a limited
impact on muscle deoxygenation but induces a greater fall in cerebral oxygenation
compared with normal breathing conditions. Despite this phenomenon, performance is
not impaired, probably because of a higher oxygen uptake during the recovery periods
following sprints.
Key words
hypoxia - NIRS - hypoxemia - combat sports - VHL