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http://bura.brunel.ac.uk/handle/2438/9918
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DC Field | Value | Language |
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dc.contributor.author | Amann, M | - |
dc.contributor.author | Romer, LM | - |
dc.contributor.author | Pegelow, DF | - |
dc.contributor.author | Jacques, AJ | - |
dc.contributor.author | Hess, CJ | - |
dc.contributor.author | Dempsey, JA | - |
dc.coverage.spatial | United States | - |
dc.coverage.spatial | United States | - |
dc.coverage.spatial | United States | - |
dc.date.accessioned | 2015-01-23T12:24:11Z | - |
dc.date.available | 2006-07 | - |
dc.date.available | 2015-01-23T12:24:11Z | - |
dc.date.issued | 2006 | - |
dc.identifier.citation | Journal of Applied Physiology, 101:1, pp. 119 - 127, 2006 | en_US |
dc.identifier.issn | 1522-1601 | - |
dc.identifier.uri | http://jap.physiology.org/content/101/1/119 | - |
dc.identifier.uri | http://bura.brunel.ac.uk/handle/2438/9918 | - |
dc.description.abstract | The 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.extent | 119 - 127 | - |
dc.format.extent | 119 - 127 | - |
dc.format.extent | 119 - 127 | - |
dc.language | eng | - |
dc.language.iso | en | en_US |
dc.publisher | American Physiological Society | en_US |
dc.subject | Adult | en_US |
dc.subject | Electromyography | en_US |
dc.subject | Exercise | en_US |
dc.subject | Exercise test | en_US |
dc.subject | Humans | en_US |
dc.subject | Male | en_US |
dc.subject | Motor activity | en_US |
dc.subject | Motor neurons | en_US |
dc.subject | Muscle contraction | en_US |
dc.subject | Muscle fatigue | en_US |
dc.subject | Oxygen | en_US |
dc.subject | Oxygen consumption | en_US |
dc.subject | Quadriceps muscle | en_US |
dc.title | Effects of arterial oxygen content on peripheral locomotor muscle fatigue | en_US |
dc.type | Article | en_US |
dc.identifier.doi | http://dx.doi.org/10.1152/japplphysiol.01596.2005 | - |
dc.relation.isPartOf | Journal of Applied Physiology | - |
dc.relation.isPartOf | Journal of Applied Physiology | - |
dc.relation.isPartOf | Journal of Applied Physiology | - |
pubs.issue | 1 | - |
pubs.issue | 1 | - |
pubs.issue | 1 | - |
pubs.volume | 101 | - |
pubs.volume | 101 | - |
pubs.volume | 101 | - |
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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