QUICK SEARCH:   [advanced] Author: Keyword(s):
Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents

First published online July 6, 2005
Journal of Experimental Biology 208, 2809-2816 (2005)
Published by The Company of Biologists 2005
doi: 10.1242/jeb.01700

This Article Summary Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by di Prampero, P. E. Articles by Antonutto, G. Search for Related Content PubMed PubMed Citation Articles by di Prampero, P. E. Articles by Antonutto, G. Social Bookmarking                         What's this?

Sprint running: a new energetic approach

P. E. di Prampero^1,*, S. Fusi¹, L. Sepulcri², J. B. Morin³, A. Belli³ and G. Antonutto¹

¹ Section of Physiology, Department of Biomedical Sciences and MATI (Microgravity, Ageing, Training, Immobility) Centre of Excellence, University of Udine, Udine 33100, Italy
² School of Sport Sciences, University of Udine, Gemona (Udine) 33013, Italy
³ Laboratory of Physiology, Unit PPEH (Physiology and Physiopathology of Exercise and Handicap), University of Saint-Etienne, 42005 Saint-Etienne cedex 2, France

View larger version (8K): [in a new window]   Fig. 1. Simplified view of the forces acting on a runner. The subject is accelerating forward while running on flat terrain (A) or running uphill at constant speed (B). The subject's body mass is assumed to be located at the centre of mass (COM); af=forward acceleration; g=acceleration of gravity; g'=(af2+g2)0.5 is the acceleration resulting from the vectorial sum of af plus g; T=terrain; H=horizontal; (=arctan g/af) is the angle between runner's body and T; the angle between T and H is '=90–. (Modified from di Prampero et al., 2002.)

View larger version (9K): [in a new window]   Fig. 2. Actual (gray, thick line) and modelled (black, thin line) forward speed s (m s–1) as a function of time t (s) at the onset of a typical 100 m run for subject 7. Actual speed was accurately described by: s(t)=10.0*(1–e–t/1.42). The maximal speed (smax) was 10.0 m s–1.

View larger version (14K): [in a new window]   Fig. 3. Running velocity as calculated by the exponential model, as a function of the actual running speed for Subject 7. The linear relationship is reported in the figure (N=234); identity line is also shown.

View larger version (7K): [in a new window]   Fig. 4. The instantaneous forward acceleration af (m s–2), obtained as described in the text, is plotted as a function of the distance d (m) for subject 7.

View larger version (11K): [in a new window]   Fig. 5. Equivalent body mass (EM; A) and equivalent slope (ES; B), as a function of the distance d (m) for subject 7.

View larger version (18K): [in a new window]   Fig. 6. Energy cost of sprint running Csr (J kg–1 m–1), as calculated by means of Eq. 14, as a function of the distance d (m) for subject 7. Energy cost of constant speed running is indicated by the lower horizontal thin line. Black and hatched distances between appropriate lines indicate effects of EM and ES, respectively. Upper horizontal thin line indicates average Csr throughout the indicated distance.

View larger version (15K): [in a new window]   Fig. 7. Metabolic power Pmet (W kg–1), as calculated from the product of Csr (see Fig. 6) and the speed, as a function of time t (s) for subject 7. Average power over 4 s is indicated by horizontal thin line.

CiteULike

Complore

Connotea

Del.icio.us

Digg

Reddit

Technorati

Twitter