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Christoph Triska Bettina Karsten Chris Beedie Bernhard Koller-Zeisler Alfred Nimmerichter Harald Tschan 《European Journal of Sport Science》2018,18(3):332-340
The aim of the study was to determine whether estimates of the speed–duration relationship are affected using different time-trial (TT) field-based testing protocols, where exhaustive times were located within the generally recommended durations of 2–15?min. Ten triathletes (mean?±?SD age: 31.0?±?5.7?years; height: 1.81?±?0.05?m; body mass: 76.5?±?6.8?kg) performed two randomly assigned field tests to determine critical speed (CS) and the total distance covered above CS (D?). CS and D? were obtained using two different protocols comprising three TT that were interspersed by 60?min passive rest. The TTs were 12, 7, and 3?min in Protocol I and 10, 5, and 2?min in Protocol II. A linear relationship of speed vs. the inverse of time (s?=?D??×?1/t?+?CS) was used to determine parameter estimates. Significant differences were found for CS (p?=?0.026), but not for D? (p?=?0.123). The effect size for CS (d?=?0.305) was considered small, while that for D? was considered moderate (d?=?0.742). CS was significantly correlated between protocols (r?=?0.934; p?0.001), however, no correlation was found for D? (r?=?0.053; p?=?0.884). The 95% limits of agreement were ±0.28m?s?1 and ±73.9?m for CS and D?, respectively. These findings demonstrate that the choice of exhaustive times within commonly accepted durations results in different estimates of CS and D?, and thus protocols cannot be used interchangeably. The use of a consistent protocol is therefore recommended, when investigating or monitoring the speed–duration relationship estimates in well-trained athletes. 相似文献
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Christine Baldwin 《Learned Publishing》2002,15(3):165-174
The Joint Information Systems Committee (JISC) is currently developing a new electronic information environment that will revolutionize how users at academic institutions discover and access scholarly material. This new information environment will provide seamless and integrated access to national and local collections, including content licensed from publishers. This article describes the reasons why the new information environment is being developed, how it will work, and why publishers should find out more. 相似文献