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Energetics of running in top-level marathon runners from Kenya.
MedLine Citation:
PMID:  22382667     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
On ten top-level Kenyan marathon runners (KA) plus nine European controls (EC, equivalent to KA), we measured maximal oxygen consumption ([Formula: see text]) and the energy cost of running (C (r)) on track during training camps at moderate altitude, to better understand the KA dominance in the marathon. At each incremental running speed, steady-state oxygen consumption ([Formula: see text]) was measured by telemetric metabolic cart, and lactate by electro-enzymatic method. The speed requiring [Formula: see text] provided the maximal aerobic velocity (v (max)). The energy cost of running was calculated by dividing net [Formula: see text] by the corresponding speed. The speed at lactate threshold (v (ΘAN)) was computed from individual Lâ(b) versus speed curves. The sustainable [Formula: see text] fraction (F (d)) at v (ΘAN) (F (ΘAN)) was computed dividing v (ΘAN) by v (max). The F (d) for the marathon (F (mar)) was determined as F (mar) = 0.92 F (ΘAN). Overall, [Formula: see text] (64.9 ± 5.8 vs. 63.9 ± 3.7 ml kg(-1) min(-1)), v (max) (5.55 ± 0.30 vs. 5.41 ± 0.29 m s(-1)) and C (r) (3.64 ± 0.28 vs. 3.63 ± 0.31 J kg(-1) m(-1)) resulted the same in KA as in EC. In both groups, C (r) increased linearly with the square of speed. F (ΘAN) was 0.896 ± 0.054 in KA and 0.909 ± 0.068 in EC; F (mar) was 0.825 ± 0.050 in KA and 0.836 ± 0.062 in EC (NS). Accounting for altitude, running speed predictions from present data are close to actual running performances, if F (ΘAN) instead of F (mar) is taken as index of F (d). In conclusion, both KA and EC did not have a very high [Formula: see text], but had extremely high F (d), and low C (r), equal between them. The dominance of KA over EC cannot be explained on energetic grounds.
Authors:
Enrico Tam; Huber Rossi; Christian Moia; Claudio Berardelli; Gabriele Rosa; Carlo Capelli; Guido Ferretti
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-3-2
Journal Detail:
Title:  European journal of applied physiology     Volume:  -     ISSN:  1439-6327     ISO Abbreviation:  -     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-3-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Département de Neurosciences Fondamentales, Université de Genève, Geneva, Switzerland.
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