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• W2019988305 abstract "The mechanical efficiency of positive work was studied in six subjects performing three different types of exercises. On the first occasion the subjects ran on a motor-driven treadmill at 3.33 m s-1;the second and the third exercises consisted of performing rhythmical vertical jumps for 1 min both in rebound (RJ) and no-rebound (NRJ) conditions. The mechanical efficiency calculated in NRJ, which reflects only the conversion of biochemical energy into mechanical work, was found to be lower than the corresponding observation in RJ, 17.2 vs. 27.8% (P < 0.001), respectively. These differences could not be explained by only the storage and recoil of elastic energy occurring in RJ compared with NRJ. The calculated extra work delivered ‘free’ was greater than the potential elastic energy which could be stored within the leg extensor muscles (187 vs. 124 J for each jump, P < 0.05). It is likely that other factors might be responsible for the extra work found in NRJ. It was suggested that the difference in the length of time to perform positive work between a simple shortening contraction and a stretch-shortening muscular activity could be also responsible for the enhanced efficiency observed in RJ. This suggestion was supported by the high relationship (P < 0.001) found between the time to perform positive work and the mechanical efficiency measured in jumping and estimated during running." @default.
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• W2019988305 date "1987-11-01" @default.
• W2019988305 modified "2023-10-16" @default.
• W2019988305 title "The effect of pre-stretch on mechanical efficiency of human skeletal muscle" @default.
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• W2019988305 doi "https://doi.org/10.1111/j.1748-1716.1987.tb08246.x" @default.
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