Abstract
We compared upper limb muscle oxygenation responses during repeated double-poling sprint exercise in normobaric hypoxia and normoxia. Eight male kayakers completed a repeated double-poling sprint exercise (3 × 3 × 20-s maximal sprints, 40-s passive recovery, 5-min rest) in either hypoxia (HYP, FiO2 = 14.5%) or normoxia (NOR, FiO2 = 20.9%). Power output, muscle oxygenation of triceps brachii muscle (using near infrared spectroscopy), arterial oxygen saturation, and cardiorespiratory variables were monitored. Mean power output tended to be lower (-5.2%; P = 0.06) in HYP compared with NOR, while arterial oxygen saturation (82.9 ± 0.9% vs. 90.5 ± 0.8%) and systemic oxygen uptake (1936 ± 140 vs. 2408 ± 83 mL⋅min-1) values were lower (P < 0.05). Exercise-induced increases in deoxygenated hemoglobin (241.7 ± 46.9% vs. 175.8 ± 27.2%) and total hemoglobin (138.0 ± 18.1% vs. 112.1 ± 6.7%) were greater in HYP in reference to NOR (P < 0.05). Despite moderate hypoxia exacerbating exercise-induced elevation in blood perfusion of active upper limb musculature, power output during repeated double-poling exercise only tended to be lower.
Highlights
There is a growing interest into the efficacy of repeated sprint training in hypoxia (RSH) on anaerobic capacity and repeated sprint ability (RSA) in team and racket sports (Faiss et al, 2013; Brocherie et al, 2017; Hamlin et al, 2018)
We have found that it took about 10-s to reach peak power output during maximal sprint due to lower stroke rate and larger range of motion compared with cycle sprint exercise
Peak and mean power outputs tended to be lower in HYP compared with NOR, the differences did not reach statistical significance
Summary
There is a growing interest into the efficacy of repeated sprint training in hypoxia (RSH) on anaerobic capacity and repeated sprint ability (RSA) in team and racket sports (Faiss et al, 2013; Brocherie et al, 2017; Hamlin et al, 2018). According to a recent metaanalysis, RSH causes greater gain for RSA, compared with same training in normoxia, with only trivial differences for maximal oxygen uptake (Brocherie et al, 2017). Despite previous reports demonstrating improved performance, physiological factors underlying additional training adaptations with RSH have not been fully clarified. Bowtell et al (2014) compared acute physiological responses (blood lactate concentration and vastus lateralis muscle oxygenation) during repeated treadmill sprints under five different levels of inspired Despite previous reports demonstrating improved performance, physiological factors underlying additional training adaptations with RSH have not been fully clarified. Bowtell et al (2014) compared acute physiological responses (blood lactate concentration and vastus lateralis muscle oxygenation) during repeated treadmill sprints under five different levels of inspired
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