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Abstract ICSEMIS2008-1

Hydric losses and prediction of performance from VO2max during the semi-marathon of Dakar

Mandengue Samuel Honoré 1,2* , Faye Jean 1, Badji Lansana1, Hounkpevi Carlos 1, Cissé Fallou 1.

1 Département  de Physiologie, Faculté de Médecine, Université Cheikh Anta Diop de Dakar, Sénégal

2 Sports and Exercise Physiology Unit, Faculty of Sciences, University of Douala,, Cameroon.

      * Corresponding and presenting author:  shmandengue@yahoo.fr
Introduction

In 2000, the semi-marathon of Dakar (SMD) became an international competition, and was approved by the International Association of Athletics’ Federations (IAAF) in 2006. The aim of the present investigation is to study anthropometric and physiological parameters of athletes participating to this competition, since this has not yet been done.

Materials and Methods
The SMD is raced on a circuit of 21 km through Dakar, the Capital of Senegal. Eighteen male candidates (age range, 23 to 48 years) volunteered to participate to this study. They were two military and 16 civilians, with 15 being members of an organized team, training one hour/day, five times/week. Their maximal oxygen uptake (VO2max) was determined one week before using the 20 m shuttle test of LEGER. The weight of all subjects was measured using a scale with impedance-meter, before the onset of the trial and the end, to determine the hydric losses. The impedance-meter scale measured the percentage of fatty mass. Body temperature was measured at the armpit, at rest and at the end of the competition. The non parametric test of Wilcoxon was used after a one-way ANOVA with repeated measures, to compare data, and the Spearman’s test was used to find correlation between variables.
Results

Tableau 1: Anthropometric characteristics, physiological parameters and performance in mean ± SD  (n = 18)

Height

(m)

Body mass

(Kg)

BMI

(Kg/m2)

Fatty mass

(%)

VO2max

(mL/min/kg)

Hydric losses

(kg)

Body 

Increase  (°C)

Performance

(s)

1.8 ± 0.1

 

69 ± 9

 

16.1± 5.7

 

20.5 ± 3.4

 

50.1 ± 5.0

 

1.9 ± 0.8

 

1.9 ± 0.5

 

5717 ± 915

 

T° = Temperature;  BMI = Body mass index

Significant negative correlations were found between VO2max and the fatty mass (r = -0.50; p = 0.04); between VO2max and BMI (r = -0.49; p = 0.04). Significant positive correlations were found between VO2max and performance (rank) (r = 0.74; p = 0.002) (Fig. 1); between performance (duration) and body temperature increase (r = 0.91; p = 0.0002)


 


Discussion/Conclusion

The results of this study and the correlations found between some parameters show that:

  • Athletes have a fatty mass higher than normal range
  • VO2max is negatively influenced by the fatty mass
  • The best performing athletes had higher body temperature increase; which reveals a more important heat production, resulting from a greater oxygen uptake for the metabolic energy production. This is in agreement with the positive and significant correlation found between VO2max and the performance
  • The performance of the athletes is predictable from their VO2max in most cases
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