Int J Sports Med 2007; 28(11): 945-951
DOI: 10.1055/s-2007-965067
Training & Testing

© Georg Thieme Verlag KG Stuttgart · New York

Blood Lactate and Heat Stress during Training in Rowers

H. Maciejewski1 , L. Messonnier2 , B. Moyen1 , M. Bourdin1
  • 1Laboratory of Biomechanics and Human Modelling, Faculty of Medicine Lyon-Sud, Oullins cedex, France
  • 2Laboratory of Modelling Physical Activities, Department STAPS, Le Bourget du Lac cedex, France
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Publikationsverlauf

accepted after revision October 15, 2006

Publikationsdatum:
24. Mai 2007 (online)

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Abstract

The purpose of the present study was to test the hypothesis that large increases in blood lactate concentration ([La]b) and/or body temperature may occur during an endurance training on a rowing ergometer and disrupt training. The influence of an increase in air convection on the capacity to perform a prolonged exercise was also explored. Ten trained oarsmen were asked to undergo twice, in control (C) and increased air ventilation (AV) conditions, two 30-min trainings on a rowing ergometer at a work rate corresponding to 2.5 mmol · L-1 of [La]b determined during a previous incremental exercise (P2.5). Four subjects did not complete the training session in C despite a steady state in [La]b in two of them. In these four subjects, the end of the exercise was associated with the highest measured rectal temperatures (Tre, 39.4 ± 0.1 °C) and rate of perceived exertion (RPE, 17.8 ± 0.3). Regarding the six other subjects, their heart rate, oxygen uptake, RPE, Tre and water loss values were lower (p < 0.05) in AV than in C. [La]b displayed the same profile in C and AV. This study suggests that i) high body temperature may constitute a significant factor of perceived exertion and disrupt indoor training session, and ii) capacity to perform an endurance training on a rowing ergometer was improved by increasing air convection.

References

1 C = 8.3√v (Ts - Ta) Ac, where C represents the exchange by convection (in W), v the wind speed (in m · s-1), Ts the mean skin temperature (in °C), Ta the ambient temperature (in °C), and Ac the body area (in m2).

Hugo Maciejewski

Laboratory of Biomechanics and Human Modelling
Faculty of Medicine Lyon-Sud

69921 Oullins cedex

France

Fax: + 33 478 86 14 31

eMail: hugo.maciejewski@univ-lyon1.fr