Sprint running: a new energetic approach
| Autor: | di Prampero, A, Fusi, S, Sepulcri, L, Morin, J, Belli, A, Antonutto, G, di Prampero, P. |
|---|---|
| Přispěvatelé: | Dipartimento di Matematica e Informatica - Universita Udine (DIMI), Università degli Studi di Udine - University of Udine [Italie] |
| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
Adult
Male Physiology [SDV]Life Sciences [q-bio] Acceleration Posture Biophysics Constant speed Geometry Aquatic Science Models Biological Biophysical Phenomena Running 03 medical and health sciences 0302 clinical medicine Humans Molecular Biology Ecology Evolution Behavior and Systematics Metabolic power Physics 030229 sport sciences Biomechanical Phenomena Sprint Insect Science Energy cost Animal Science and Zoology Energy Metabolism 030217 neurology & neurosurgery Angle alpha |
| Zdroj: | Journal of Experimental Biology Journal of Experimental Biology, The Company of Biologists, 2005, 208 (14), pp.2809-2816. ⟨10.1242/jeb.01700⟩ |
| ISSN: | 0022-0949 1477-9145 |
| Popis: | International audience; The speed of the initial 30 m of an all-out run from a stationary start on a flat track was determined for 12 medium level male sprinters by means of a radar device. The peak speed of 9.46+/-0.19 m s(-1) (mean +/- s.d.) was attained after about 5 s, the highest forward acceleration (a(f)), attained immediately after the start, amounting to 6.42+/-0.61 m s(-2). During acceleration, the runner's body (assumed to coincide with the segment joining the centre of mass and the point of contact foot terrain) must lean forward, as compared to constant speed running, by an angle alpha = arctang/a(f) (g = acceleration of gravity). The complement (90-alpha) is the angle, with respect to the horizontal, by which the terrain should be tilted upwards to bring the runner's body to a position identical to that of constant speed running. Therefore, accelerated running is similar to running at constant speed up an ;equivalent slope' ES = tan(90-alpha). Maximum ES was 0.643+/-0.059. Knowledge of ES allowed us to estimate the energy cost of sprint running (C(sr), J kg(-1) m(-1)) from literature data on the energy cost measured during uphill running at constant speed. Peak Csr was 43.8+/-10.4 J kg(-1) m(-1); its average over the acceleration phase (30 m) was 10.7+/-0.59 J kg(-1) m(-1), as compared with 3.8 for running at constant speed on flat terrain. The corresponding metabolic powers (in W kg(-1)) amounted to 91.9+/-20.5 (peak) and 61.0+/-4.7 (mean). |
| Databáze: | OpenAIRE |
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