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Repeated‐sprint performance and vastus lateralis oxygenation: Effect of limited O 2 availability
Author(s) -
Billaut F.,
Buchheit M.
Publication year - 2013
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/sms.12052
Subject(s) - sprint , oxygenation , medicine , crossover study , motor unit recruitment , deoxygenation , vastus medialis , confidence interval , vastus lateralis muscle , hypoxia (environmental) , anesthesia , zoology , chemistry , cardiology , physical therapy , skeletal muscle , physical medicine and rehabilitation , oxygen , placebo , electromyography , biology , biochemistry , alternative medicine , organic chemistry , pathology , catalysis
This study examined the influence of muscle deoxygenation and reoxygenation on repeated‐sprint performance via manipulation of O 2 delivery. Fourteen team‐sport players performed 10 10‐s sprints (30‐s recovery) under normoxic ( NM : F I O 2 0.21) and acute hypoxic ( HY : F I O 2 0.13) conditions in a randomized, single‐blind fashion and crossover design. Mechanical work was calculated and arterial O 2 saturation ( S p O 2 ) was estimated via pulse oximetry for every sprint. Muscle deoxyhemoglobin concentration ([ HHb ]) was monitored continuously by near‐infrared spectroscopy. Differences between NM and HY data were analyzed for practical significance using magnitude‐based inferences. HY reduced S p O 2 (–10.7 ± 1.9%, with chances to observe a higher/similar/lower value in HY of 0/0/100%) and mechanical work (–8.2 ± 2.1%; 0/0/100%). Muscle deoxygenation increased during sprints in both environments, but was almost certainly higher in HY (12.5 ± 3.1%, 100/0/0%). Between‐sprint muscle reoxygenation was likely more attenuated in HY (–11.1 ± 11.9%; 2/7/91%). The impairment in mechanical work in HY was very largely correlated with HY ‐induced attenuation in muscle reoxygenation ( r = 0.78, 90% confidence limits: 0.49; 0.91). Repeated‐sprint performance is related, in part, to muscle reoxygenation capacity during recovery periods. These results extend previous findings that muscle O 2 availability is important for prolonged repeated‐sprint performance, in particular when the exercise is taken in hypoxia.