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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Bailey, Stephen J. Varnham, Richard L. DiMenna, Fred J. Breese, Brynmor C. Wylie, Lee J. Jones, Andrew M. |
| Description | Author Affiliation: Bailey SJ ( Sport and Health Sciences, College of Life and Environmental Sciences, University of Exeter, Exeter, UK); Varnham RL ( Sport and Health Sciences, Faculty of Health and Life Science, Oxford Brookes University, Oxford, UK); DiMenna FJ ( Teachers College, Department of Biobehavioral Sciences, Columbia University, New York, New York); Breese BC ( School of Biological and Biomedical Sciences, Plymouth University, Plymouth, UK.); Wylie LJ ( Sport and Health Sciences, College of Life and Environmental Sciences, University of Exeter, Exeter, UK); Jones AM ( Sport and Health Sciences, College of Life and Environmental Sciences, University of Exeter, Exeter, UK) |
| Abstract | We tested the hypothesis that inorganic nitrate (NO3 (-)) supplementation would improve muscle oxygenation, pulmonary oxygen uptake (VÌo2) kinetics, and exercise tolerance (Tlim) to a greater extent when cycling at high compared with low pedal rates. In a randomized, placebo-controlled cross-over study, seven subjects (mean ± SD, age 21 ± 2 yr, body mass 86 ± 10 kg) completed severe-intensity step cycle tests at pedal cadences of 35 rpm and 115 rpm during separate nine-day supplementation periods with NO3 (-)-rich beetroot juice (BR) (providing 8.4 mmol NO3 (-)/day) and placebo (PLA). Compared with PLA, plasma nitrite concentration increased 178% with BR (P < 0.01). There were no significant differences in muscle oxyhemoglobin concentration ([O2Hb]), phase II VÌo2 kinetics, or Tlim between BR and PLA when cycling at 35 rpm (P > 0.05). However, when cycling at 115 rpm, muscle [O2Hb] was higher at baseline and throughout exercise, phase II VÌo2 kinetics was faster (47 ± 16 s vs. 61 ± 25 s; P < 0.05), and Tlim was greater (362 ± 137 s vs. 297 ± 79 s; P < 0.05) with BR compared with PLA. These results suggest that short-term BR supplementation can increase muscle oxygenation, expedite the adjustment of oxidative metabolism, and enhance exercise tolerance when cycling at a high, but not a low, pedal cadence in healthy recreationally active subjects. These findings support recent observations that NO3 (-) supplementation may be particularly effective at improving physiological and functional responses in type II muscle fibers. |
| File Format | HTM / HTML |
| ISSN | 87507587 |
| e-ISSN | 15221601 |
| Journal | Journal of Applied Physiology |
| Issue Number | 11 |
| Volume Number | 118 |
| Language | English |
| Publisher | American Physiological Society |
| Publisher Date | 2015-06-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Discipline Physiology Beta Vulgaris Bicycling Dietary Supplements Fruit And Vegetable Juices Muscle Contraction Drug Effects Muscle, Skeletal Nitrates Administration & Dosage Oxygen Consumption Performance-enhancing Substances Cross-over Studies Exercise Tolerance Kinetics Muscle Fatigue Metabolism Plant Roots Comparative Study Randomized Controlled Trial |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Physiology (medical) Sports Science |
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