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Abstract
The aim of this study was to estimate the optimal resistance on a specially designed motorized treadmill (Gymrol) to obtain instantaneous peak power (IPP), 1‐second peak power (PP), and 5‐second mean power (MP) during running in subjects with different body sizes and athletic backgrounds. Thirty‐five male subjects were divided into four groups: control, power, cyclists, and miscellaneous. Two sessions of 5‐second all‐out sprints were performed against resistances that were 5, 8, 10, 13, 15, and 20% of the treadmill's maximal resistance of 1352 N. The power produced for propulsion (horizontal power) was measured. There was no difference in any set of power variable measurements between the first and the second session. A test‐retest reliability coefficient of r = 0.89, r = 0.84, and r = 0.80 for each of the MP, PP, and IPP tests, respectively, was measured. The IPP values (range, 2419 to 2934 W) were three to three and one‐half times higher than those for PP (range, 764 to 1014 W) and MP (range, 657 to 868 W). The absolute value of IPP did not show a difference between any two groups but PP was significantly higher in the power group. Group mean anthropometric measures were also recorded and correlated with the different power outputs when each power variable was related to body mass, lean body mass, or lean leg volume. There was no difference between group sets in the measurement of PP and MP, but IPP was significantly lower in the power group compared with the other groups. The optimal resistance required for all groups, except cyclists, needed to be higher to measure PP than to measure IPP. The results showed that there is an optimal resistance setting (10, 13, and 15%) needed to make an accurate determination of anaerobic power, as measured on this type of treadmill.
Notes
This study was partially supported by a grant from Tecmachine, Andrezieux Bouthéon, France.
Correspondence to: A. Jaskólski. National Institute for Fitness and Sport, 250 N. University Blvd., Indianapolis, IN 46202‐5192.