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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Iaia, F. Marcello Perez-Gomez, Jorge Thomassen, Martin Nordsborg, Nikolai B. Hellsten, Ylva Bangsbo, Jens |
| Description | Country affiliation: Denmark Author Affiliation: Iaia FM ( Dept. of Exercise and Sport Sciences, Section of Human Physiology, August Krogh Bldg., Universitetsparken 13, DK-2100 Copenhagen Ø, Denmark.) |
| Abstract | The hypothesis investigated whether exercise performance over a broad range of intensities is determined by specific skeletal muscle characteristics. Seven subjects performed 8-10 exhaustive cycle trials at different workloads, ranging from 150 to 700 W (150 min to 20 s). No relationships between the performance times at high and low workloads were observed. A relationship (P < 0.05) was noticed between the percentage of fast-twitch x fibers and the exercise time at 579 ± 21 W (â¼30 s; r(2) = 0.88). Capillary-to-fiber-ratio (r(2): 0.58-0.85) was related (P < 0.05) to exercise time at work intensities ranging from 395 to 270 W (2.5-21 min). Capillary density was correlated (r(2) = 0.68; P < 0.05) with the net rate of plasma K(+) accumulation during an â¼3-min bout and was estimated to explain 50-80% (P < 0.05) of the total variance observed in exercise performances lasting â¼30 s to 3 min. The Na(+)-K(+) pump ß(1)-subunit expression was found to account for 13-34% (P < 0.05) during exhaustive exercise of â¼1-4 min. In conclusion, exercise performance at different intensities is related to specific physiological variables. A large distribution of fast-twitch x fibers may play a role during very intense efforts, i.e., â¼30 s. Muscle capillaries and the Na(+)-K(+) pump ß(1)-subunit seem to be important determinants for performance during exhaustive high-intensity exercises lasting between 30 s and 4 min. |
| File Format | HTM / HTML |
| ISSN | 87507587 |
| e-ISSN | 15221601 |
| Journal | Journal of Applied Physiology |
| Issue Number | 6 |
| Volume Number | 110 |
| Language | English |
| Publisher | American Physiological Society |
| Publisher Date | 2011-06-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Discipline Physiology Muscle Contraction Muscle, Skeletal Metabolism Physical Endurance Analysis Of Variance Bicycling Biological Markers Blood Biopsy Capillaries Physiology Energy Metabolism Hydrogen-ion Concentration Lactic Acid Muscle Fibers, Fast-twitch Blood Supply Cytology Oxygen Consumption Potassium Regression Analysis Sodium-potassium-exchanging Atpase Task Performance And Analysis Time Factors Randomized Controlled Trial Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Physiology (medical) Sports Science |
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