Effect of repeated sprint training in hypoxia on acute and chronic redox balance modulation.

Little is known regarding the effects high-intensity training performed in hypoxia on the oxidative stress and antioxidant systems. The aim of this study was to assess the potential effect of 4 weeks of repeated sprint training in hypoxia (RSH) on the redox balance. Forty male well-trained cyclists were matched into two different interventions (RSH,  = 20) or in normoxia, RSN,  = 20) and tested twice (before (Pre-) and after (Post-) a 4-week of training) for performance (repeated sprint ability (RSA) test), oxidative stress, and antioxidant status.

Effects of Three Different Distance/Elevation-Gain Ultra-Trail Races on Red Blood Cell Oxidative Stress and Senescence, and Blood Rheology.

Purpose: Red blood cells (RBCs) senescence and blood rheology during ultra-endurance running events appear to be impacted differently depending on the race distance. The physiological mechanisms underlying these differences are poorly understood.

Methods: We investigated the effects of three different ultra-trail running races performed in La Reunion Island (Mascareignes, "the 70 km", 70 km/4,000 m D+; Trail Du Bourbon, "the 100 km", 100 km/6,090 m D+; Diagonale des Fous, "the 170 km", 170 km/10,500 m D+) on RBC oxidative stress, RBC senescence and blood rheology in 66 finishers (18 "70 km", 24 "100 km", 24 "170 km").

Nocturnal pulse oxygen saturation dynamics at simulated high altitude: Predictive value for acute mountain sickness in healthy men born pre-term.

The physiological sequelae of pre-term birth might influence the responses of this population to hypoxia. Moreover, identifying variables associated with development of acute mountain sickness (AMS) remains a key practically significant area of altitude research. We investigated the effects of pre-term birth on nocturnal oxygen saturation ( ) dynamics and assessed the predictive potential of nocturnal -related metrics for morning AMS in 12 healthy adults with gestational age < 32 weeks (pre-term) and 12 term-born control participants.

Dietary nitrate supplementation very slightly mitigates the oxidative stress induced by high-intensity training performed in normobaric hypoxia.

Oxidative stress is augmented under hypoxic environments, which may be attenuated with antioxidant supplementation. We investigated the effects of dietary nitrate (NO-) supplementation combined with high-intensity training performed under hypoxic conditions on antioxidant/pro-oxidant balance. Thirty trained participants were assigned to one of three groups - HNO: hypoxia (13% FO) + NO-; HPL: hypoxia + placebo; CON: normoxia (20.