Summary
The running economy of seventeen athletes was studied during running at a low speed (3.3 m · s−1) on a motor-driven treadmill. The net energetic cost during running expressed in kJ·kg−1·km−1 was on average 4.06. As expected, a positive relationship was found between the energetic cost and the percentage of fast twitch fibres (r=0.60,n=17,p<0.01). In addition, the mechanical efficiency during two different series of jumps performed with and without prestretch was measured in thirteen subjects. The effect of prestretch on muscle economy was represented by the ratio between the efficiency of muscular work performed during prestretch jumps and the corresponding value calculated in no prestretch conditions. This ratio demonstrated a statistically significant relationship with energy expenditure during running (r=−0.66,n=13,P<0.01), suggesting that the elastic behaviour of leg extensor muscles is similar in running and jumping if the speeds of muscular contraction during eccentric and concentric work are of similar magnitudes.
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Bosco, C., Montanari, G., Ribacchi, R. et al. Relationship between the efficiency of muscular work during jumping and the energetics of running. Europ. J. Appl. Physiol. 56, 138–143 (1987). https://doi.org/10.1007/BF00640636
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DOI: https://doi.org/10.1007/BF00640636