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- W1976380386 abstract "PURPOSE: The aim of the present study was to clarify the effect of various levels of inspired oxygen fractions (FIO2) on quadriceps muscle fatigability during isolated muscle exercise. METHODS: Six healthy males were participated in this study. Quadriceps twitch force (Qtw) was determined using supra-maximal magnetic femoral nerve stimulation. In Experiment I, maximal voluntary contraction (MVC) and Qtw of resting quadriceps muscle were assessed in normoxia (FIO2 = 0.21), acute-hypoxia (FIO2 = 0.11), and acute-hyperoxia (FIO2 = 1.0). In Experiment II, the subjects performed three sets of nine, intermittent, unilateral, isometric, submaximal quadriceps muscle contractions (62+/−3.7% MVC followed by one MVC in each set) while breathing hypoxic, normoxic or hyperoxic gas. Myoelectrical activity of the vastus lateralis was measured during exercise, and Qtw was assessed before and after exercise. RESULTS: There were no significant differences in MVC and Qtw of the resting quadriceps muscle among the three FIO2s (Experiment I). These results indicated that changes in FIO2 had no effect on maximal quadriceps contractility pre-exercise conditions, and thus quadriceps muscle contractions performed at the same absolute intensity were conducted at the same relative exercise intensity (Experiment II below). The increase in integrated electromyogram during intermittent submaximal contractions in hypoxia (15.4+/−1.3%) was larger (P<0.05) than in normoxia (7.2+/−1.7%) or hyperoxia (6.7+/−1.1%). The percent reduction of twitch force (potentiated Qtw) in hypoxia (−27.0+/−2.0%) was significantly (P<0.05) greater than those in normoxia (−21.4+/−3.0%) and hyperoxia (−19.9+/−2.7%); as were the changes in intra-twitch indices of contractile properties. CONCLUSIONS: These findings suggest that quadriceps muscle fatigability is exaggerated during isolated muscle exercise in acute-hypoxia, and that a significant portion of hypoxic effect on exercise induced peripheral muscle fatigue is independent of the relative exercise intensity." @default.
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- W1976380386 date "2007-05-01" @default.
- W1976380386 modified "2023-09-25" @default.
- W1976380386 title "Effect of Arterial Oxygenation on Fatigability of Isolated Quadriceps Muscle" @default.
- W1976380386 doi "https://doi.org/10.1249/01.mss.0000274813.12009.fa" @default.
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