Please use this identifier to cite or link to this item: http://buratest.brunel.ac.uk/handle/2438/9918
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dc.contributor.authorAmann, M-
dc.contributor.authorRomer, LM-
dc.contributor.authorPegelow, DF-
dc.contributor.authorJacques, AJ-
dc.contributor.authorHess, CJ-
dc.contributor.authorDempsey, JA-
dc.coverage.spatialUnited States-
dc.coverage.spatialUnited States-
dc.coverage.spatialUnited States-
dc.date.accessioned2015-01-23T12:24:11Z-
dc.date.available2006-07-
dc.date.available2015-01-23T12:24:11Z-
dc.date.issued2006-
dc.identifier.citationJournal of Applied Physiology, 101:1, pp. 119 - 127, 2006en_US
dc.identifier.issn1522-1601-
dc.identifier.urihttp://jap.physiology.org/content/101/1/119-
dc.identifier.urihttp://bura.brunel.ac.uk/handle/2438/9918-
dc.description.abstractThe effect of arterial O2 content (Ca(O2)) on quadriceps fatigue was assessed in healthy, trained male athletes. On separate days, eight participants completed three constant-workload trials on a bicycle ergometer at fixed workloads (314 +/- 13 W). The first trial was performed while the subjects breathed a hypoxic gas mixture [inspired O2 fraction (Fi(O2)) = 0.15, Hb saturation = 81.6%, Ca(O2) = 18.2 ml O2/dl blood; Hypo] until exhaustion (4.5 +/- 0.4 min). The remaining two trials were randomized and time matched with Hypo. The second and third trials were performed while the subjects breathed a normoxic (Fi(O2) = 0.21, Hb saturation = 95.0%, Ca(O2) = 21.3 ml O2/dl blood; Norm) and a hyperoxic (Fi(O2) = 1.0, Hb saturation = 100%, Ca(O2) = 23.8 ml O2/dl blood; Hyper) gas mixture, respectively. Quadriceps muscle fatigue was assessed via magnetic femoral nerve stimulation (1-100 Hz) before and 2.5 min after exercise. Myoelectrical activity of the vastus lateralis was obtained from surface electrodes throughout exercise. Immediately after exercise, the mean force response across 1-100 Hz decreased from preexercise values (P < 0.01) by -26 +/- 2, -17 +/- 2, and -13 +/- 2% for Hypo, Norm, and Hyper, respectively; each of the decrements differed significantly (P < 0.05). Integrated electromyogram increased significantly throughout exercise (P < 0.01) by 23 +/- 3, 10 +/- 1, and 6 +/- 1% for Hypo, Norm, and Hyper, respectively; each of the increments differed significantly (P < 0.05). Mean power frequency fell more (P < 0.05) during Hypo (-15 +/- 2%); the difference between Norm (-7 +/- 1%) and Hyper (-6 +/- 1%) was not significant (P = 0.32). We conclude that deltaCa(O2) during strenuous systemic exercise at equal workloads and durations affects the rate of locomotor muscle fatigue development.en_US
dc.format.extent119 - 127-
dc.format.extent119 - 127-
dc.format.extent119 - 127-
dc.languageeng-
dc.language.isoenen_US
dc.publisherAmerican Physiological Societyen_US
dc.subjectAdulten_US
dc.subjectElectromyographyen_US
dc.subjectExerciseen_US
dc.subjectExercise testen_US
dc.subjectHumansen_US
dc.subjectMaleen_US
dc.subjectMotor activityen_US
dc.subjectMotor neuronsen_US
dc.subjectMuscle contractionen_US
dc.subjectMuscle fatigueen_US
dc.subjectOxygenen_US
dc.subjectOxygen consumptionen_US
dc.subjectQuadriceps muscleen_US
dc.titleEffects of arterial oxygen content on peripheral locomotor muscle fatigueen_US
dc.typeArticleen_US
dc.identifier.doihttp://dx.doi.org/10.1152/japplphysiol.01596.2005-
dc.relation.isPartOfJournal of Applied Physiology-
dc.relation.isPartOfJournal of Applied Physiology-
dc.relation.isPartOfJournal of Applied Physiology-
pubs.issue1-
pubs.issue1-
pubs.issue1-
pubs.volume101-
pubs.volume101-
pubs.volume101-
pubs.organisational-data/Brunel-
pubs.organisational-data/Brunel/Brunel Staff by College/Department/Division-
pubs.organisational-data/Brunel/Brunel Staff by College/Department/Division/College of Health and Life Sciences-
pubs.organisational-data/Brunel/Brunel Staff by College/Department/Division/College of Health and Life Sciences/Dept of Life Sciences-
pubs.organisational-data/Brunel/Brunel Staff by College/Department/Division/College of Health and Life Sciences/Dept of Life Sciences/Sport-
pubs.organisational-data/Brunel/University Research Centres and Groups-
pubs.organisational-data/Brunel/University Research Centres and Groups/School of Health Sciences and Social Care - URCs and Groups-
pubs.organisational-data/Brunel/University Research Centres and Groups/School of Health Sciences and Social Care - URCs and Groups/Brunel Institute for Ageing Studies-
pubs.organisational-data/Brunel/University Research Centres and Groups/School of Health Sciences and Social Care - URCs and Groups/Centre for Systems and Synthetic Biology-
Appears in Collections:Sport
Dept of Life Sciences Research Papers

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