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- W1977103426 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 (∼30 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 ∼3-min bout and was estimated to explain 50–80% ( P < 0.05) of the total variance observed in exercise performances lasting ∼30 s to 3 min. The Na + -K + pump β 1 -subunit expression was found to account for 13–34% ( P < 0.05) during exhaustive exercise of ∼1–4 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., ∼30 s. Muscle capillaries and the Na + -K + pump β 1 -subunit seem to be important determinants for performance during exhaustive high-intensity exercises lasting between 30 s and 4 min." @default.
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- W1977103426 date "2011-06-01" @default.
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- W1977103426 title "Relationship between performance at different exercise intensities and skeletal muscle characteristics" @default.
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- W1977103426 doi "https://doi.org/10.1152/japplphysiol.00420.2010" @default.
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