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- W2016152617 abstract "This study compares the effects of two short multiple-sprint exercise (MSE) (6 × 6 s) sessions with two different recovery durations (30 s or 180 s) on the slow component of oxygen uptake ([Formula: see text]O 2 ) during subsequent high-intensity exercise. Ten male subjects performed a 6-min cycling test at 50% of the difference between the gas exchange threshold and [Formula: see text]O 2peak (Δ50). Then, the subjects performed two MSEs of 6 × 6 s separated by two intersprint recoveries of 30 s (MSE 30 ) and 180 s (MSE 180 ), followed 10 min later by the Δ50 (Δ50 30 and Δ50 180 , respectively). Electromyography (EMG) activities of the vastus medialis and lateralis were measured throughout each exercise bout. During MSE 30 , muscle activity (root mean square) increased significantly (p ≤ 0.04), with a significant leftward-shifted median frequency of the power density spectrum (MDF; p ≤ 0.01), whereas MDF was significantly rightward-shifted during MSE 180 (p = 0.02). The mean [Formula: see text]O 2 value was significantly higher in MSE 30 than in MSE 180 (p < 0.001). During Δ50 30 , [Formula: see text]O 2 and the deoxygenated hemoglobin ([HHb]) slow components were significantly reduced (–27%, p = 0.02, and –34%, p = 0.003, respectively) compared with Δ50. There were no significant modifications of the [Formula: see text]O 2 slow component in Δ50 180 compared with Δ50 (p = 0.32). The neuromuscular and metabolic adaptations during MSE 30 (preferential activation of type I muscle fibers evidenced by decreased MDF and a greater aerobic metabolism contribution to the required energy demands), but not during MSE 180 , may lead to reduced [Formula: see text]O 2 and [HHb] slow components, suggesting an alteration in motor units recruitment profile (i.e., change in the type of muscle fibers recruited) and (or) an improved muscle O 2 delivery during subsequent exercise." @default.
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- W2016152617 date "2012-12-01" @default.
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- W2016152617 title "Effects of prior short multiple-sprint exercises with different intersprint recoveries on the slow component of oxygen uptake during high-intensity exercise" @default.
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- W2016152617 doi "https://doi.org/10.1139/h2012-096" @default.
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